US2720730A

US2720730A - Deburring machine

Info

Publication number: US2720730A
Application number: US319201A
Authority: US
Inventors: George H Kroger
Original assignee: Studebaker Packard Corp
Current assignee: Studebaker Packard Corp
Priority date: 1952-11-07
Filing date: 1952-11-07
Publication date: 1955-10-18
Anticipated expiration: 1972-10-18

Description

Oct. 18, 1955 KRQGER 2,720,730

DEBURRING MACHINE Filed NOV. 7, 1952 4 eets-Sheet l INVENTOR.

ATTORNEYS.

Oct. 18, 1955 .G. H. KROGER 2,720,730

DEBURRING MACHINE 4 Sheets-Sheet 2 Filed Nov. 7, 1952 g Q g Q 3;

i 0 i Q wm o N; Q Q

w l\ w m 8 J J T T g "D g I g I I J i Q Q \9 o v \Q 3 Q INVENTOR.

0 vi N y ay; 40

ATTORNEYS.

Oct. 18, 1955 G. H. KROGER DEBURRING MACHINE 4 Sheets-$heet 5 Filed Nov, 7, 1952 INVENTOR.

ATTORNEYS.

Oct. 18, 1955 G. H. KROGER 2,720,730

DEBURRING MACHINE Filed Nov. 7, 1952 4 eet 4 4 4 C JNVENTOR.

A TTORNEYS.

United States Patent DEBURRING MACHINE George H. Kroger, South Bend, Ind, assignor, by mesne assignments, to Shrdebalrer-Packard Corporation, a cerporation of Application November 7, 1952, Serial N 0. 312201 11 Claims. (Cl. 51--7) The present invention relates to deburring machines and, particularly, to machines for deburring or finishing the blades of a jet engine compressor rotor.

In forming various articles of manufacture, it frequently is necessary that the articles be deburred to eliminate sharp edges or projections that could be a source of injury. Also, articles of manufacture that are machined to very high degrees of accuracy usually require deburring or rounding of sharp corners or the like, resulting from the machining, to eliminate a source of danger and/or to finish the article. For example, the blades of the rotor for a jet engine compressor must be machined to a very high degree of accuracy and thereafter it is necessary to round off or finish the blade edges. Heretofore, the deburring, finishing, or rounding has been done manually by skilled workmen equipped with portable electric grinders. The grinding must be done skillfully and accurately despite the tedious nature of the work. Due to the various factors involved, finish grinding is extremely time consuming. For example, one jet engine rotor with which I am acquainted requires approximately 32 man hours of grinding to finish the blades thereof.

It is an object of the present invention to provide a machine for automatically deburring, rounding or finishing articles of manufacture, whereby production is speeded up, substantial economies are attained in man hours expended, and more uniform finishing is obtained.

According to the present invention, I provide a machine comprising, basically, means for retaining a volume of abrasive material, and means for rotating or otherwise moving the article to be finished through the material. In the embodiment of my invention described in detail hereinafter, I provide a frame for supporting an open top box adapted for the reception of abrasive material and for rotatively supporting a jet engine rotor in such manner that the rotor blades extend into the material in the box, and a suitable drive for rotating the rotor. As the rotor is rotated, the blades thereof pass through the material in the box and the sharp edges thereof, resulting from accurate machining, are automatically rounded or finished. I have found that the machine of my invention will finish the blades of the said one rotor referred to hereinbefore in approximately one half hour, as compared with the 32 man hours previously required.

It is also an object of the present invention to provide means for preventing an accumulation of abrasive material in any one portion of the box or container therefor, whereby uniform finishing of the article is assured.

In accordance with the foregoing, one object of the invention is to provide a deburring or finishing machine wherein the article to be finished is supported substantially on a horizontal axis and the box or container of abrasive material is supported at an inclination to the horizontal, and a second object of the invention is to provide means for reciprocating the box of abrasive material along a straight line at said inclination transversely of the axis of the article.

A further object of the invention is the provision of a deburring or finishing machine wherein the article to be finished is moved first in one direction and then in the opposite direction to insure complete and uniform finishing of the article. For example, with a jet engine rotor, the rotor is rotated in one direction for a predetermined period of time and then is rotated in the opposite direction for an equal period of time, while the box of abrasive material is continuously reciprocated.

A still further object of the invention is the provision of a deburring or finishing machine that is economical of manufacture and assembly and that is sturdy and adapted for continued rugged service.

Other objects and advantages of the present invention will become apparent in the following detailed description of a preferred embodiment of the invention, wherein reference is made to the accompanying drawings, in which:

Figure 1 is a side elevation of the deburring machine of the invention;

Figure 2 is a fragmentary side view, on an enlarged scale, partly in section and partly in elevation, of the deburring machine;

Figure 3 is a fragmentary vertical cross section, on a further enlarged scale, the view being taken substantially on line 3-3 of Figure 2;

Figure 4 is an elevational view of the rotor drive train; and

Figure 5 is a horizontal view, partly in section and partly in plan, of the rotor drive train, the portions of the view in section being taken substantially on the line 5-5 of Figure 4.

Referring now to the drawings, the deburring machine of the present invention includes a frame, indicated generally at 10, consisting of a plurality of frame members each formed of pipe and suitably secured together, as by welding. In particular, the frame 10 includes a plurality of upper longitudinal frame members 12 with three of the members 12 being disposed at each side of the frame, lower longitudinal frame members 14 at each side of the frame which, at one end, extend beyond the ends of the upper longitudinal frame members 12, vertical frame members 16 extending between the outer upper longitudinal frame members 12 and the lower longitudinal frame members 14, a plurality of transverse tie and bracing members 18 extending between the upper longitudinal frame members 12 at each end and between the lower longitudinal frame members 14 at each vertical frame member 16, and a plurality of bracing studs 20 connected between the extending portion of the lower longitudinal frame members 14 and the top transverse tie 18 at that end of the frame. The frame consisting of the

members

12, 14, 16, 18 and 20 is supported at an inclination to the horizontal by means of a plurality of legs 22 of increasing length from one end of the machine to the other, that is from the left hand to the right hand end of the machine, as the same is shown in Figure 1. Hereinafter, the end of the frame supported by the shortest legs 22, which is also the end of the machine including the extending portions of the lower longitudinal frame members 14, will be referred to as the drive end of the machine. The opposite sides of the frame 10 are preferably closed by means of side plates 24 closing the rectangular spaces between adjacent vertical frame mernbers 16 and the upper and lower longitudinal frame members 12 and 14, each of the side plates 24 being provided with a removable section 26 for accommodating access to the interior of the machine when desired.

At each side of the frame 10, and approximately at the mid point of the upper longitudinal frame members 12, a plate 28 is secured to the top of the three longitudinal frame members 12. Each of the plates 28 is adapted for the support of a bearing bracket 30 suitably secured, as by welding, to the respective plate 28. As will be appreciated, the plates 28 are generally in alignment with one another transversely of the frame and the bearing brackets 30 are so mounted thereon that the bearing brackets are in alignment with one another transversely of the frame; Each of the bearing brackets 30 comprises a fixed lower portion 32 and a removal top section 3.4 pivoted to the lower portion 32; so that the bearing brackets are adapted L be openedto receiye bearings 36 adaptedfor the rotatable support of the axle of an article of manufacture to be deburred or shed A h n n F ures. 1 to li e m sh n of t e pre n invention is particularly adapted for working a rotor 37 o iet i e mpress the rotor 3 nsl ns a st b shaft 38 at each end thereof defining an axle for the rotor, a p u a of blade rin s 40 aip u l ty f pac rin 2' p e e eenadiace it blade v n and l tudinal tie bolts 44 for securing the

rings

48 and 42 tose The st ha ts-.38 a e ca rie a e c e f the rotor on the respective end rings of the rotor assembly. As will be appreciated, the blade rings 49 each consist of a blade carrier'and'a plurality of radially outwardly extending blades carried thereby. When assembled, the spacers 42 and blade carriers 40 define a tapered or conical base portion from which the blades extend radially outward. As shown, the blades progressively increase in length from the large to the small ends of the tapered base portion of the rotor. At the larger end of the rotor, the stub shaft 38 is tubular and is tion in a jet engine assembly. v

In use of the machine of the present invention, rotors coming ofi of the assembly line are moved to the masplit bearings may be provided, or the shaft, or hearing engaging portions of the brackets 30 may be accurately. 'machined so as to receive the stub shafts 38 of the rotor 37 directlyfrather than utilizing separate bearings 36 slipped on the shafts of the rotor before the same is.

lowered into the bearing brackets of the .deburring machine. Accordingly, the brackets 30 will be referred to hereinafter as split supports fOI journaling the axle 38 of the rotor or article of manufacture to be debu'rred or finished by the machine of the present invention; As

will be appreciated, the supports 30 are disposed at op-' posite sides of the machine and. are aligned transversely of the machine so as to support the rotor in such 'position that the axis or axle thereof is disposed substantially horizontally and extends transversely of the frame 10.

One of the mounting'plates 2 8, namely, the one adjacent the large diameter end of the rotor, is of substantial 7 size and iength so as to provide a platform for mounting a rotor drive train, indicated generally at 48. The drive a train 48 is adapted to drive or. move the rotor or Other.

article of manufacture journaled in the supports 30 and includes a reversible electric motor 50 connected through a speed reducer 52 to a drive pinion 54. The pinion 54 meshes with a gear 56 mounted on one end of a shaft 58 which is journaled in a frame 66 mounted on the platform 28 At the other end thereof, the shaft 58 carries a pinion 62 meshing with a gear 64 mounted on a shaft 66 which is also journaled in the frame 60. ,The shaft 66, at the opposite end thereof, carries. a pinion 68 meshing with a gear 70 mounted on a shaft 72 journaled in a second frame 74, which frame is also'securecl to the platform 28 in alignment with the frame 60. The shaft 72 carries a pinion 76 meshing with an intermediate gear splined onthe inner wall thereof for operative associa- 78 mounted on a shaft 80 which is journaled in the frame 74. The intermediate gear 78 also meshes with a gear 82 including a hollow shaft 84, which shaft is journaled in the frame 74. That portion of the drive train consisting of the pinion 54 and the various components 56 to 84 is preferably disposed within a housing or enclosure 86. As will be appreciated, the arrangement of the various gears and pinions is such as to provide a substantial speed reduction between the speed reducer 52 and the last gear 82 of the drive train.

A shaft 88, adapted to be driven by the drive train 48, is rotatably and slidably mounted in the hollow shaft 84 of the gear 82, the shaft 88 being disposed in alignment with the supports 30 and being preferably of sub- .stantial length so that the drive train 48 may be spaced from the adjacent support 30 to accommodate reception inrthe machine of rotor shafts of various lengths. At the end thereof adjacent the support 30, the'shaft 88 includes means for establishing operative driving con-v nection with an article of manufacture journaled in the supports 30 In the particular case, the shaft 88 carries a splined head 90 adapted to be inserted in the hollow'stub shaft38 of the rotor to establish operative driving connection between the. shaft 88 and the rotor 37. The splined' head 90 is suitably secured to the shaft 88 by means of a set screw 92, orsuitable like means. The shaft 88 projects through the hollow shaft 84 and to the opposite side of the frame 74 carries a collar 94 suitably keyed or otherwise secured thereto. To this side of the frame, the hollow shaft 84 is provided with a radially r outwardly extending flange 96 having a plurality of annularly disposed holes therein adapted for the reception of a pin 98 carried by the collar 94, whereby the collar and thusly, the shaft 88 may be clutched to or unclutche d' from the hollow shaft 84 of the last gear 82 in the drive train 48. To provide means for locking the shaft 88 in clutched engagement with the shaft 84, the radial flange 96 of the shaft 84 is provided with a circumferential groove 100 adapted for the reception of the finger portions of a plurality of clutch levers 102 pivoted to" the collar 94 of the shaft 88 and biased by spring means 104 to retain the finger portions thereof within the circum fe'rential groove 10.0 in the flange 96 of the shaft 84.

As will be appreciated the clutch mechanism may be modified in various known manners. For example, the pin may be provided on the radial flange 96 of the shaft 84 and the holes may be provided in the collar 94 of the shaft 88,01 a resilient sleeve may be suitably pinned to the collar 94 or the radial flange 96 and carry a pin adapted to be received within holes-provided in the flange 96 or collar 94, respectively, to provide for limited torsional elasticity in the clutch mechanism. 'Other modified clutch mechanisms will readily suggest themselves to those skilled in the art. 'In use of the machine, unclutch ing of the collar 94 from the flange 96 will result in retraction of the shaft 88 to effect a separation or unclutching of the splined head 90 of the shaft 88 and the stub shaft 38 of the rotor 37. Sincethe motor 50 of the drive train 48 is reversible, it will be appreciated that the drive train 48 is adapted to rotate the rotor 37 slowly in either direction, as will be described in detail here inafter.

Within the frame 10, longitudinal guides or guide means 106 are provided at each side of themachine;

Each guide preferably comprises a pair of spaced parallelangle irons'108 secured to the vertical frame members 16. The angle irons 108 are adapted for the 'reception therebetween of rollers 110 mounted on shafts 112 which shafts are mounted in bracing members 114 suitably 'se-- cured to the sides of a wooden box-like frame or subframe 116, whereby the sub-frame 116 is supported by the longitudinal guides 106 for movement longitudinally of the frame 10. As will be appreciated, movement of the sub-frame 116 longitudinally of the frame 10 will be effected transversely of the axis of the article of manu facture journaled in the supports 30. To provide for accurate positioning of the rollers 110 within the guide means 106, a bearing plate 118 or the like is preferably secured to the guide surface of the upper angle iron 108. For supporting the sub-frame 116 against side thrust, a plurality of horizontally disposed rollers 120 are mounted on the lower angle iron 108 and bear against the sides of the bracing members 114. The rollers 120 are so spaced as to accommodate a predetermined reciprocation of the rollers 110 and sub-frame 116 longitudinally of the frame 10.

The sub-frame 116 provides means for mounting a metallic container or box 122 adapted for the reception of abrasive material. As will be appreciated as the description proceeds, the box 122 comprises means for defining a bed adapted for the reception of abrasive materials. As used herein, the term abrasive materials is intended to apply to or describe not only materials that are truly abrasive in nature, but also to describe or apply to materials that can be utilized for polishing, finishing or otherwise working various articles of manufacture. In the particular use for which the machine of the present invention is adapted, the abrasive material preferably comprises mine run Garnet of various particle sizes, as is indicated at 124 in Figures 2 and 3. The bed defining means or box 122, as viewed in longitudinal cross section, is dish-shaped so as to provide arcuate end walls, with the length of the box 122 being such as to accommodate longitudinal movement of the box with respect to the rotor 37. The box 122 is preferably lined with a heavy layer 126 of canvas or the like to prevent undue wear of the material from which the box is formed. The box 122 is of a depth to receive, with clearance, a desired portion of the article of manufacture to be finished by the machine. As shown in Figures 2 and 3, the box 122 is adapted for the reception of the entire blade portion of the rotor 37 and the side walls of the box extend to or slightly above the upper surfaces of the

upper frame members

12 and 18 to provide for the reception of an adequate amount of abrasive material and to prevent the escape of such material. Intermediate the top and hotton thereof, the box 122 is provided with outwardly extending side wall portions 128 adapted to be rested upon or secured to the tops of the side and end walls of the sub-frame 116.

The guide means 106 and rollers 110 support the sub frame 116, and thusly the box 122, for reciprocatory movement longitudinally of the frame it To reciprocate the frame 116 and the box 122, a crank rod 13% is pivotally connected at one end to the sub-frame 116 and at its other end to a crank 132 secured to the shaft of a gear reducer 134 driven by an electric motor 136, the gear reducer 134 and the electric motor 136 being shown in back of a housing member 138 for enclosing the crank rod 130 and the crank 132 in Figure 1. As shown, the gear reducer 134 and the electric motor 136 are mounted on the extending portions of the lower longitudinal frame members 14 and are supported by several short legs 22.

For operating and controlling the

electric motors

50 and 136, a control panel 140 is mounted at the drive end of the frame 10. The controls effected on the

motors

50 and 136 will be described in detail hereinafter with respect to the operation of the complete machine. To stop or cushion the reciprocatory movement of the sub-frame 116 at each end or limit of its movement, suitable frame members 142 are provided between the guide means 106 at each end thereof and spring pressed butters or shock absorbers 144, which are adapted to engage suitable angle iron reinforcing members 146 secured to the ends of the sub-frame 116, are mounted thereon. As is clearly shown in Figure 2, the angle iron 146 adjacent the drive end of the frame also provides a mounting for the crank arm 13%.

In use and operation of the machine of the present invention, the rotor drive shaft 88 is withdrawn, the split Cir supports 30 are opened and a rotor 37 is lowered onto the machine With the end portions of the axle 38 thereof being received within the open supports 30 and the blade portion thereof being received between the supports 30 and extending into the box 122 or bed of abrasive material 124. After the rotor has been properly positioned on the machine, the split supports are closed to provide bearings within which the axle of the rotor is journaled for rotation. Thereafter, the shaft 88 is moved inwardly so as to move the splined head 91 thereof into driving engagement with the internally splined end portion of the afie 38 of the rotor. As the splined head 99 of the shaft 88 is moved into driving engagement with the axle of the rotor, the finger portions of the spring biased levers 102 of the clutch means are moved into locking engagement in the circumferential groove 109 in the flange 96 of the gear 82 of the drive train 48. Before engagement of the finger portions of the levers 102 in the groove is accomplished, it may be necessary to rotate the shaft 88 slightly to effect alignment between the pin 98 and the one of the holes provided in the flange 96 so as to establish driving connection between the gear 82 and the shaft 83. After the shaft 88 has been coupled to the gear 82, the motor 5% may be started to drive the train 48 and effect rotation of the shaft 88 and thusly of the rotor 37. As will be appreciated from the nature of the speed reducer 52 and the speed reducing drive train 48, the blades of the rotor 37 will be moved very slowly through the bed of abrasive material provided in the box 122. At the same time, the motor 136 is started in operation to effect reciprocation of the bed of material 124 transversely of the axis of the rotor 37.

Due to the fact that the frame is disposed at a slight inclination to the horizontal, which inclination is preferably in the order of three to five degrees, and due to the fact that the bed of material is reciprocated, the bed of material will maintain a substantially constant and uniform depth so as to prevent the accumulation of material in any one portion of the box 122. As the rotor is rotated and the box 122 is reciprocated, the blades of the rotor, which as pointed out are disposed within the layer of material, will be finished by the material to eliminate all sharp edges on the blades. Due to the slow movement of the blades, the same will not in any way be damaged by the materials in the box 122. To insure uniform finishing of the blades, the rotor is first rotated in one direction for a predetermined interval and is then rotated in the opposite direction for a predetermined interval. With respect to the said one compressor rotor that i have referred to hereinbefore, I have found that finishing of the rotor blades is accomplished by rotating the rotor in one direction for approximately 15 minutes and then rotating the rotor in the opposite direction for approximately 15 minutes, during which half hour the bed of material is continuously reciprocated. In a preferred embodiment of my invention, the control panel located at the drive end of the machine preferably includes automatic timing and control means whereby the

motors

50 and 136 are started in operation by closing a single switch after which the motor 50 is operated first in one direction for a pr determined interval, 15 minutes, and then is automatically reversed to effect reverse rotation of the rotor 37 for a like interval, again 15 minutes, whereby reverse rotation of the rotor, as described hereinbefore, is automatically accomplished. The control means for the machine are also such as to provide for continuous operation of the motor 136 during the time that the motor 50 is in operation. t the end of the half hour cycle described, the control means for the machine may suitably include means for automatically dicontinuing operation of the motors 5t) and 136 whereby the rotor will be automatically stopped when the finishing operation thereon has been completed.

In view of the capability of the machine of being automatic in operation, it will be appreciated that the only necessary employment of workers is that required to lower the rotor into the machine, secure the bearing supports 30 about the axle of the rotor, effect engagement of the shaft 8.8 with'the axle of the rotor and with the shaft of the gear ciated that the machine of the present invention provides for substantial economies in man hours expended and increases production to a very great extent. In addition,

' I have found that finishing of the rotor blades as accomplished by the machine of my invention results in a more uniform and accurate finishing of the rotor blades than skilled workmen equipped with'portable electric grinders have been able to accomplish.

VVrth respect to the relative movement of the rotor blades and the bed of abrasive material, it is to be noted that the blades and the bed of abrasive material are moved in corresponding directions. That is, each individual blade in passing through the bed of material will move from left to right, or vice versa, as the rotor is V viewed in Figure 2. Likewise, the bed of material is reciprocated from left toright and vice versa as the same is viewed in Figure 2. Accordingly, relative movement is provided between the blades of the rotor and the bed of 'material, but relative movement takes place along what may be referred to as corresponding paths of movement. The sub-frame 116 in being reciprocated longitudinally of the frame will, at its opposite limits of movement, abut against the'buifers 144 whereby the reciprocatory move merit of the sub-frame is cushioned at each limit.

In view of the foregoing, it will be appreciated that the present invention provides substantial advantages over prior methods of deburring, or finishing articles of manufacture and provides a'machine of economical manufacture and assembly for accomplishing the aforesaid results.

While I have described what I regard to be a preferred embodiment of my invention, it will be appreciated that various changes,'rearrangements and modifications may be made therein without departing from the scope of the invention, as defined by the appended claims.

Iclaim:

1. In a machine of the character described, a frame, means on'said frame for supporting an article of manufacture formovement with respect to said frame, bed defining means adapted for the reception of abrasive material, said bed means being, movably supported by said frame beneath said supporting means, said bed means being adapted for the free reception of at least a portion of an article of manufacture supported by said supporting means whereby the article is positioned at least partially in abrasive material in said bed means, means for moving the article of manufacture through the abrasive material in said bed means, said bed means being supported for movement in a straight line path corresponding to the path of movement of the article of manufacture through the abrasive material in said bed means, and means simultaneously reciprocating said bed means along said path during movement of the article of manufacture through the abrasive material, said bed means being of a length at least equal to the path of reciprocal movement thereof,

'whereby the article. during its movement is simultaneously subjected to the reciprocal abrading action of the abrasive material in said bed means.

2. In a machine of the character described, a frame,

means on said frame for supporting an article of manu-- facture for movement with respect to said frame, bed defining means adapted for the receptionof solid unsuspended abrasive material, said means being movably supported by said frame beneath said supporting means, said bed means being adapted for the free reception of at least a portion of an article of manufacture supported by said supporting means whereby, the article is positioned at least partially in abrasive material in said bed means,

means for moving the article of manufacture through the abrasive materialrin said bed means, said bed means being supported for movement, in a straight line path corre-' tion of said bed means maintaining the abrasive material therein at a'uniform depth;

3. In a machine of the character described, a frame, means onsaid frame for supporting an article of manufacture for movement'with respect to said frame, bed defining means adapted for' the reception of solid unsuspended abrasive material, said bed means being movably supported by said frame beneath said supporting means, said bed means being adapted for the free reception of at least a portion of an article of manufacture supported by said supporting means whereby the article is positioned at least partially in abrasive material in said bed means, said supporting .means supporting the article of manufacture for movement in a generally horizontal path through the abrasive material in said bed means,

reversible drive means for moving the articleof manufacture in oppositedirections in the said generally horizontal path through-the abrasive material in said bed.

of a length at least equal to'the path of reciprocal movement thereof, whereby the article during movement thereof in one direction or the other is simultaneously subjected to the reciprocal abrading action of the abrasive material'in'said bed means, the inclination and reciprocation of said bed means maintaining the abrasive material therein at a uniform depth. 7

4. In a machine of the character described, a frame, supports on said frame for rotatably mounting an article of manufacture on a horizontal axis, means for slowly rotating an article of manufacture mounted on said sup-' ports, a bed adapted for the reception of abrasive material s'upported by said frame beneath and between said supports for the reception of;at least a portion of an article mounted on said supports, said bed being supported for reciprocatory movement in a path inclined to the horizontal and extending transversely of the axis of an article mounted on said supports, and means for reciprocating said bed along said path.

5. In a machine of a character described, a frame,

supports on said frame for rotatably mounting an article of manufacture, means for slowly rotating an article of manufacture in both directions when the same is mounted on said supports, a bed adapted for the reception of abrasive material supported by said frame beneath and between said-supports for the reception of at least a portion of an article mounted on said supports, said bed being supported for reciprocatory movement in a path inclined to the horizontal and extending transversely of the axis of an articlemounted on said supports, and means for reciprocating said bed along said straight line.

6. A machine for deburring or finishing rotatable articles of manufacture, comprising a frame, a pair of split supports mounted on opposite sides of said frame in alignment transversely of said frame for journaling the axle of a rotatable article, reversible means for slowly rotating an'article journaled in said supports in opposite directions, and an open top box mounted on said frame at an inclination to the horizontal beneath and between said supports, said box being of a size freely to receive at least a portion of an article journaled in said supports and being adapted for the reception of abrasive material to encompass at least a part of an article journaled in said supports.

7. A machine for deburring or finishing rotatable articles for manufacture, comprising a frame, a pair of split supports mounted on opposite sides of said frame in alignment transversely of said frame for journaling the axle of a rotatable article, reversible means for slowly rotating an article journaled in said supports in opposite directions, an open top box movably mounted on said frame at an inclination to the horizontal beneath and between said support, said box being of a size freely to receive at least a portion of an article journaled in said supports and being adapted for the reception of abrasive material to encompass at least a part of an article journaled in said supports, guide means mounted longitudinally on said frame for defining a longitudinal path of movement for said box inclined slightly to the horizontal and extending transversely of the axle of an article journaled in said supports, and means for reciprocating said box along said path.

8. A machine for deburring or finishing rotatable articles of manufacture, comprising a frame, a pair of split supports mounted on opposite sides of said frame in alignment transversely of said frame for journaling the axle of a rotatable article, reversible means for slowly rotating an article journaled in said supports in opposite directions, an open top box movably mounted on said frame at an inclination to the horizontal beneath and between said supports, and an open top box movably mounted on said frame beneath and between said supports, said box being of a size freely to receive at least a portion of an article journaled in said supports and being adapted for the reception of abrasive material to encompass at least a part of an article journaled in said supports, guide means mounted longitudinally on said frame for defining a longitudinal path of movement for said box extending transversely of the axle of an article journaled in said supports, means for reciprocating said box, said frame being so constructed and arranged as to be inclined to the horizontal in the longitudinal direction thereof whereby said box is reciprocable in a path inclined to the horizontal, and bulfer means disposed at opposite ends of said frame for cushioning the movement of said box at its limits of movement.

9. A machine for deburring or finishing the blades of compressor rotors and like articles of manufacture, comprising a frame, a pair of bearing supports mounted on opposite sides of said frame in alignment transversely of said frame, said supports being adapted for rotatably mounting the axle of a rotor, a first electric motor, a shaft driven by said first motor, said shaft being adapted for operative connection with the rotor axle, said frame including longitudinal guides disposed beneath said supports, a sub-frame mounted in said guides for movement longitudinally of said frame, a box carried by said subframe, said box being of a size to receive the blades of the rotor with freedom for movement longitudinally of said frame and being adapted for the reception of abrasive material, a second electric motor, and drive means between said second motor and said sub-frame for reciprocating said sub-frame longitudinally of said frame, said frame being so constructed as to support the rotor substantially horizontally and to support said sub-frame and said box for movement at an inclination to the horizontal.

10. A machine for deburring and finishing the blades of compressor rotors and like articles of manufacture, comprising a frame, a pair of bearing supports mounted on opposite sides of said frame in alignment transversely of said frame, said supports being adapted for rotatably mounting the axle of a rotor, a reversible electric motor, a shaft driven by said motor, said shaft being adapted for operative connection with the rotor axle, said frame including longitudinal guides disposed beneath said supports, a sub-frame mounted in said guides for movement longitudinally of said frame, a box carried by said sub frame, said box being of a size to receive the blades of the rotor with freedom for movement longitudinally of said frame and being adapted for the reception of abrasive material, a second electric motor, and drive means between said second motor and said sub-frame for reciprocating said sub-frame longitudinally of said frame, said reversible motor being operable first in one direction for a predetermined interval and then in the opposite direction for a like interval, whereby the rotor is rotated first in one direction and then in the opposite direction While the box of abrasive material is continuously reciprocated transversely of the axis of the rotor.

11. A machine for deburring or finishing the blades of compressor rotors and like articles of manufacture, comprising a frame, a pair of bearing supports mounted on opposite sides of said frame in alignment transversely of said frame, said supports being adapted for rotatably mounting the axle of a rotor, a reversible electric motor, speed reducing means driven by said motor, said speed reducing means terminating in a driven shaft, clutch means for selectively connecting and disconnecting said driven shaft and said speed reducing means, said shaft being adapted for operative connection with the rotor axle, said frame including longitudinal guides disposed between said supports, a sub-frame mounted in said guides for movement longitudinally of said frame, a box carried by said sub-frame, said box being of a size to receive the blades of the rotor with freedom for movement longitudinally of said frame and being adapted for the reception of abrasive material, a second electric motor, drive means between said second motor and said sub-frame for reciprocating said sub-frame longitudinally of said frame, said reversible motor being operable first in one direction for a predetermined interval and then in the opposite direction for a like interval, whereby the rotor is slowly rotated first in one direction and then in the opposite direction while the box of abrasive material is continuously reciprocated transversely for the axis of the rotor, said frame being so constructed as to support the rotor substantially horizontally and to support said sub-frame and said box for movement at an inclination to the horizontal.

References Cited in the file of this patent UNITED STATES PATENTS 856,072 Lehman June 4, 1907 1,328,603 Stirling Jan. 20, 1920 2,425,640 Pruitt et al Aug. 12, 1947 FOREIGN PATENTS 18,107 Norway Mar. 3, 1908