US1702679A

US1702679A - Combination machine for cylinder-block repairing

Info

Publication number: US1702679A
Application number: US12984A
Authority: US
Inventors: Kirke R Wilson
Original assignee: Individual
Current assignee: Individual
Priority date: 1921-07-23
Filing date: 1925-03-03
Publication date: 1929-02-19
Anticipated expiration: 1946-02-19

Description

Feb. 19, 1929. 9 1,702,679

K. R. WILSON COMBINATION MACHINE FOR CYLINDER BLOCK REPARING d July 23, 1921 4 Sheets-Sheet l @ff @fw/2m Feb. 19, 1929.

K. R. WILSON COMBINATION MACHINE FOR YLINDER BLOCK-REPAIRING OriginalFiled'July 25. 192]@ 4 Sheets-c nl L NQ NNN Inf? NQ N NN T H M\ .AAAA/ d r Af f/ H, w O NN\ \k\ Q\\ 0 Feb. 19, 1929.

1,702,679 K. R. WILSON 4 COMBINATION MACHINE FOR CYLINDER BLOCK REPAIRINC Original Filed July 25' 1921 4 Sheets-Sheet Feb. y19, 1929.

K. R. WILSON COMBINATION MACHINE FOR CYLINDER BLOCK REPAIRING Original Filed July 23, 1921 4 sheetysl 4 BRN Mrk/Ewan w www RMN www@

QI.' A

Patented Feb. 19, 1929,.

unirse asTATEs -IPATE'NT OFFICE, l

KIRKE R. WILSON, OF BUFFALO, NEW' YORK.`

COMBINATION MACHINE FOR CYLINDER-BLOCK:REPAIRING..

Original application filed July 23, 192.1, Serial No. 487,085. Divided and this application filed March 3,

Serial No. 12,984.

"lhis application is a division of my application, Serial No. 487,085 liled July 23, 219:21, which has matured into Letters PatentNo. Llf, dated March 3i, 1925.

.lliis invention relates to an improvement in combination n'iacliines for cylinder block repairing. In the patent above identified .I have described and claimed a machine by the use ot which the cylinder block of a hydr0-- iodiment of the invention is illusiln trated the accompanying drawings, wherein iguro l is a plan view of the machine with the cylinder block supported'in the first position.

Figure 2 is an end elevation of the same with the parts in the position shown in Figure l. v

igure 3 is a cross section taken on the.

line 3-3 of Figure l.

Figure is a side elevation of the machine with the cylinder block inthe second position,

Figure is a cross section taken on the line ot Figure 4.

Figure t is a detail of the boring bar disclosed in Figure el., showing the means v'for adjusting the cutting blade.

Figure Z is a section taken on the line 7-7 o t Figure 6.

Figure 8 is a side elevation of the machine with the cylinder block in the third position.

Figures 9 to 13 inclusive are detail views oit Jdie split nut by which the reciprocation of the roaming and boring bars is controlled.

Figure Mis a side elevation of the machine with the cylinder block in the fourth posi-,i

tion.

F'gure 15 is a front elevation of one of the cylinder boring bar locating plugs.

Figure 16 is a section taken on the line 1.6-16 or' Figure l5. v

Figure 17 is a diagrammatic view showling ways m 'which a scored cylinder` may be Figure 22 is a plan view of the plate or bed to which the cylinder block is secured.

ln repairing motors one or more of the following operations are necessary, rebabbitting, boring, running-in or burning-in bear ings, boring out worn'or scored cylinders, grinding valves and assembling shafts, push rod bearings, pistons and rods.

Referring to the drawings, the reference character A isused to designate the machine and the reference character l?) the cylinder block to be treated. The machine A coinprisesa base supportedon legs land having at one end a power drive and feed 32. Hingedr at to the base 30 is the plate or bed .34 to which the cylinder block B is rigidly secured. l

The bed 34,. shown particularly in Fig. 22 has a marginal flange 85 and an arm 36 projecting at an angle therefrom preferably integral with the bed. The outer end 37 of the arm 36 is enlarged `and machined and in it are provided two holes 38 and 39 for a purpose to be described later. Projecting from the flange at each side oi the bed are in-` tegral plates 40 and 4l, against the inner faces of which the bottoni l-lange of the cylinder block to be treated is rigidly secured by bolts passing through holes in the plates 40 and ll and engaging holes already drilled in the cylinder block. In order to locate the hloclc accurately on the bed, the faces of the plates 40 and L.ll are accurately machined into alignment. The embodiment shown is particularly adapted for F ord motors and the holes in the plates are so arranged that when the cylinder block is in alignment on the bed Bt, they will always coincide with certain holes already provided in the block for the bolts holding` the lower half of the crank case in position. rlhe outer end of the block is bolted to the plate al() and the inner end to the plate 4l.

The hinges by wliich the bed is joined to the base comprise angle plates 42 fixed to the base and carrying,` the hinge plates 4:3, these being secured by fastenings 43, and angle plates 4:6 bolted to the bed in such a position that they contact with the hinge plates fr rod l? inserted through the coinciding holes in the plates 4:3 and lo holds the two parts 't'.ogether and acts as a hinge pin and can beeasily removed when it is desired to shift the position of the bed on the base.

The hole 38 in the arm 36 is not threaded and is so located that it coincides with the hole ell-8 (Figure 14) always provided in a Ford cylinder block for one of the bolts by which the water jacket (not shown) is secured to the block. A pin 49 passingl throufh the hole 38 is threaded into the hole il and clamps the block in place. The hole 39 threaded and so located that it does not coinei de with a hole in the cylinder block so that the end of the bolt (Figure 18) passing` through the hole 39 bears against the block and by turning; the holt the block is raised or lowered. The bolt 50 thus determines the position of the blocl: relative to the bed while the bolt i9 holds the parts in that position.

Along the longitudinal edges of the base are raised faces 5l which are machined into absolute alignment. By these faces the va.- rious positions of the cylinder block are accurately determined. he under side of the hed 34.1 is similarly provided with raised faces 52. The faces 52 are accurately n'iachined and when the bed is in position, rest on the faces 5l of the base. On the upper side of the bed 3l is formed an integral projection 53 the upper face of which is machined into absolute parallelism with the faces 52.

After the cylinder block has been mounted on the bed and bolted to the inner faces of the plates l0 and il a s nare or level is placed against the block flanges and rested on the projection 53. rllhe bolt is now turned to 4shift the block into the desired direction un ti l it is exactly at right angles to the jnojection and consequently to the faces 5l and 52. 7h-en this position has been reached the pin 49 is tightened to tif: the block in place. The enlarged outer end of the pin 4:9 is of such length that when the bed is swung on its hinn'es into the first position, as shown in lfioures l and 2, it bears against the base and holds the bed faces 52 at right angles to the base. Since the cylinder block. has previously been adjusted on the bed until it is at right angles to the bed faces it follows of course that it is now exactly parallel to the faces 51 of the base.

ln this position the bearings are re-babbitted by pouring Babbitt metal onto the bearing surfaces. '.lo insure accurate bearings a fixture (SO employed coinjnzising` a rod lfl of a eianie' slightly smaller than that of a lford cranl-.; raft supported on the block by cross arn'xs (52.

@n the rod (ll at each side of each bearing are pinned rings 53 and at each hearing a p is bolted to the rod between each set of rings 63 for the purpose to be described below. The arms 2' which are fixed to the rod 6l hold it above the hearing` s rfaces so as to provide a space for the babbitt lining' (see llig. 3

ln order to guide the babbitt so that it will fill the space 6G detern'iined by the rings 63 at each end of the bearing surface 61, funnel blocks (il employed. l are rl`hese blocns cut away on three sides to provide the funnels ('58a 69 and TO. Referring to Fig. l it will be noted that these 'tunnels are of different sizes corresponding to the of the bearings of the cylinder bloclr ll. The funnel G8 will be used for the front bearing'7 the funnel 69 for the center bearing and the funnel TO for the rear bearing. A. knob Tl on each blecl; facilitates handling' and nca-y be engaged by lifting toi es when the blocl-z is hot. Figure 3 nl f of iti flrnw "Lf" ln o s im s me position or ne aiioris par is w ien readv7 for pouring the babbitt.

'the plate 64; in addition to cooperating with the funnel blocks 67' also -funetions to prevent the hab itt from contacting with half the circumference of the rod lf this plate were not used and the habbitt allowed to creep around the rod so as to partly enclose it the rod could obviously not be removed without destroying the formed bearing. shown in lfig'uros l and l the plates as well as the cross arms are firmly lined to the rod thus insuringl the formation of accurate bearings in each case.

lhe power drive and feed mechanism 32 is mounted on the face 54 of the base which is parallel to the faces 5l and is operated by a art 10C' having|` loose and drive pulleys lOl,

here. 'ith to which dish. is bolted n ai l.

a pli ov cap screws 108 having` dowel litro pro ns lll?) from the caps for the f. nted out below. Through the hich receives the squared porft U2 Avfhich eY l through The worm and worin wheel the sleeve 105.

lio

are enclosed by a housing 113 having atea-ch side projecting` flanges 11,4"and115 which? act as bearings for the'sleeve 105. l As shown particularly in Fig'. 8 theshaft 112 has also a threaded portion 116 which normally`pro or feed well as rotate. -'I`his function is obtained by the use of a split nut mechanism comprising split nutv117, an annular guide' plate 118 and a cover 119. The split nut 117 is made up of two similar members 120, each including a semi-circular boss 121. In the adjacent faces of the members 120 at each side of the bosses 121 are pockets 122 to receive the ends of springs 123 by which the members 120 are normally held apartas shown in Fig. 9. Projecting from the outer face of each memberf120 adjacent the center.. of the boss 121 is a pin 124, the function of which will be pointed out later.

'Ihe guide plate 118 has an oval opening 125 in its center through which the bosses 121 and pins 124 project, recesses 126 being provided vat each end ofthe oval to receive the pins. Screws 127 passing between the members 120 outside the springs-123 secure the guide plate to the flange 115 of the housing. Collars 128 are slipped over the screws to separate the guide plate from the flange and prevent binding of the members 120 against reciprocation. Pocket-s 129 are provided in the adjacent faces of the members120 in which the collars 128 will seat when the members are brought into contact. Hencethe guide plate 118, by its oval opening125 with the recesses 126, limits the separation ofthe members 120.` The inner faces of the bosses 121 are threaded so that when the members 120 are brought together the threaded portion 116 of the shaft 112 is engaged. Inasmuch.

as the members 120 are held against longitudinal movement, if the shaft 112 so engaged be rotated it must necessarily move longitudinally. The collars 128 and the pockets 129 determine the approach of the members to each other and thus prevent muti-y lation of the threads by too close engagement of the bosses 121 and the shaft 112. e

The cover 119 has a peripheral flange 130 which completely encloses the guide plate 118. An annular groove 131 formed'in the outer face of the plate 118 receives the screws` 132 which project through the flange 130 so that the cover is held in place but allowed a rotative movement when desired. Through the center of the cover 119 is an o ening 133 for the bosses 121 and pins 124 o the member 120.

The edges of the opening 133 have a double cam-like contour so formed that when the In certain uses of this machine it is neces-- sary that the shaft 112 move longitudinally pins 124, which under pressure ofthesprings l 123 always bearagainst the edges, are at the diametrically opposite high points 136 they` will lie inthe recesses 126 of the guide plate f 118 and the bosses 121 will be. out of engage-r ment withthe shaft 112. When, however, the cover is oscillatedon the` plate 118 by the handle 135 the bosses are forced Closer together until' when the low parts 134 of the edge bear againstthe pins` the bosses are in mesh with the shaft and any rotation thereof causes it to shift longitudinally.

operations are performed.

In the base 30 and bed 34 are provided a number of holes by means of which the bedl. can be fixed securely in positionwhile certain Referring `parj rticularly to Figures 1 and 22 it will be ynoted that there are in the base three sets of such;

holes; an outer set in the outer face 51 and f numbered 150, 151, 152 and 153 respectively, an

intermediate set

154, 155, 156 and 157 and a

transverse set

158, 159 and 160, the holes 158 and 160 being in the faces 51 and locating-fa,y line at right angles to the shaft112. In the bed 34 are two. sets, the

outer holes

161, 162, 163, 164, 165, 166, 167 and 168, and the inner holes 169 170, 171 and 172. Y

The position shown in Figures 1 and :2 and` referred to as the first position is that of they cylinder' block when the main or crank shaft bearings are to be re-babbitted. It is alsothe f position in which the cranlt shaft is most easily assembled and the bearings -for the cam shaft and valve push rods are preferably reamed.

e After the bearings have been refbabbitted y as described above the rod 61 is removed and the bearingsl are subjected to a further operation by which the exposed surface of the 'babbitt is made to conform accurately to the bodiment of the invention.

:Figure 4 and referred to as thesecond position. First there is bolted to the block a fixture-200 carrying in alignn'ient with the bearings a boring bar 201l having a plurality of ,cuttersv 202. These cutters are embedded in the bar as at 203 in Fig. 7 and are held in place `by screws 204. In order to adjust a cutter in the bar a jig 205 is provided which, as is shown in detail in Figs. Gand 7 is a curved plate adaptedto bear closelyagainst However the bar 201 and having on its inner face a portion 206 recessed to receive the outer end of the cutter and determine the amount of projection. ln usino` this jig it is first applied with its inner face against the bar and the portion 206 over the end of the cutter. The screw 204 is now loosened and the cutter is pushed out against the by some means inserted through the flared opening 207 against the butt of the cutter. rl-Che cutter is thus quickly and accurately adjusted.

The boring bar 201 is fastened to the head 106 by an intermediate coupling or union 208 which connects the end of the boring bar to the shaft 112 which projects from the face of the plate 107. ln order to position the boring bar accurately with reference to the other parts of the motor7 and particularly in oder to insure that the crank shaft bearings shall carry the crank shaft absolutely parallel to the cam shaft, plates 209 (Figure 5) project from the bach of the fixture 200. The end of each plate is notched to provide a linger 210 which rests against the cam shaft 21.1. Threaded through the flange 212 on the outer face of the fixture 200 is a bolt 213 which bears against the bed 234. After the "rature has been applied to the cylinder block ith the finger 210 below the shaft 211 the bolt 213 is turned until the fingers rest against the shaft. The fixture is now further held onto the cyl inH der block by bolts 214 through the flanges. ln order to hold the bed and block against shifting pins 215 are inserted through the

holes

161 and 167 in the bed into'the holes 151 and 153 in the base. Since the boring bar must be moved longitudinally the split nut mechanism must be brought into engagement with the threaded end 116 of the shaft 112.

Should it be desired. to carry out this scraping operation by reaming, a suitable fixture and reamer are substituted for the fixture 200 and the boring bar 2017 the other arrangements being unchanged.

rlhe position show-n in Figure 8 of the drawings, referred to for convenience as the third position, is that which the cylinder block with its supporting bed 84 occupies vhen the rebabbitted main bearings are treated according` to the second method, i. e., burned-in or run-in. In performing this operation the cylinder crank shaft 225 is mounted in place and driven by the plate 107 through the dowel like projections 1.09 which engage bolt holes in the shaft flange 226. The bed is held securely in place on the base by threaded pins 227 which extend' through the holes 170 and 172 in the bed 34 and are screwed into the

holes

154 and 156 respectively in the base 30. 1n addition to the pins 227 there may be used pins 215 extending through the holes 163 and 168 in the bed 34 into the holes 150 and `152 respectively in the base 80. lllhile the last named pins may not be absolutely essential it has been found that the bed is more securely held if they are used as well as the threaded pins 227. i

Figure 14 shows the fourth position which differs from the other positions described in that the cylinder block is mounted transversely on the base instead of longitudinally. W hen so positioned the cylinders of the block are bored out by the use of a boring bar 250. The bed is held in place by one of the pins 227 inserted through one of the holes 1.69, 170, 171 or 172,'depending upon which cylinder is to be bored and screwed into the hole 159. ln addition to the pin 227 pins 215 are inserted in the holes 158 and 160 in the base7 passing through the set of

holes

161 and 163 when the pin 227 is inserted in hole 169'; 162 and 165 wheny in 17 0 164 and 167 when in 171 and 166 and 168 when in 172. The bed is thus held in place by triangularly arranged means having an apex directly in front of the cylinder operated upon so that the block is held rigidly in alignment with the power drive 32 and the cylinder is accurately bored.

The boring bar 250 is fixed to the shaft 112 by any suitable connection such as, for example7 the connection 208 shown in Figure 4 and has an enlarged intermediate portion 251 from which projects the cutting edge of the blade 252. The blade is usually rectangular and is mounted in a rectangular pocket 253 broached through the bar. The blade 252 having a cutting edge 254 extends only part way through the pocket 253 and rests on a screw 255 threaded through the lower end of the pocket which has been bored and en larged. The enlarged end 256 of the pocket is internally threaded to receive the screw 255 and opens into a flattened annular depression 257 on the bar. Arranged in a circle on the depression 257 around the screw head are twenty-four equally spaced radial lines 258 while on the screw head is a single line 259 radiating from the same center as the lines 258. The head of the screw 255 is larger than the body portion 260 which bears against the inner end of the cutter blade 252.

ln setting the blade for cutting a micrometer is used and the blade is fixed by means of the screw 255 and the holding screw 261 so as to contact with the inner surface of the average cylinder of the lrind of motor operated upon. Shoul d it be found upon examination that the cylinder to be bored is larger or smaller than the :werage the projection of the blade is increased or diminished by means of the screw 255, the

lines

258 and 259 acting as a micrometer to guide such a change.

The boring bar is prelimiinirily located in the cylinder to be bored by means of tapered plugs 275 shown in detail in Figs. 15 and 1.6. These plugs comprise two blocks 27 6 and 277 each having a semi-cylindrical recess so that when assembled as shown in the drawings a cylindrical hole 278 for the boring bar is provided. On the block 27 6 is provided a tapered fin 279 and on the block 27 7.are provided the tapered fins 280. These blocks are held together by dowelsy 381 and are acc-urately ground so that the outer faces of the

fins

279 and 280 form part of the face of a cone whose center lies on the longitudinal axis of the hole 278.

The plugs 275 are placed on the boring bar which is in the cylinder to be bored and are the-n forced into keach end of the cylinder as far as they can go. This, by reason of the accurate machining of the blocks, positions the cutter bar at the center of the cylinder.

Permanent guides 281 and 282 are now em` ployed, the former at the bottom of the cylinder block and the latter at the top. The

guide 281, shown in Fig. 21, which has a. row of holes 288 at each end, is slipped over the end of the boring bar and bolted vagainst the bottom flanges of the cylinder block. These flanges have rows of holes through which the lower half of the crank case, not shown, is bolted in place and by providingthe rows of holes 283 at each end of the guide, it is possible to find a set throughv which the guide 281 rcan be bolted to theblock.

The guide 282 has a body plate 284i which is bolted to the top of the cylinder block and in which is a hole 285 'larger than the preliminary plug 275, so that when the guide 282 is bolted into place it surrounds the guide 27 5. Projecting from theplate 284 is a bearing arm 286 byvwhich the cutter bar is supported.

It will be noted by an examination of Fig. 111v that when the permanent guides are in position the preliminary plugs or guides are easily removable, that at the bottom by reason of the opening` at the bot-tom of the cylinder block, and that at the top because the bearing arm is spaced from the upper side of the block. The plugs are first pulled out of the cylinders and then separated into the blocks276 and 277. The cutter' bar when held by the plugs 27 5 could not be revolved but the permanent guides provide bearings in which the bar can be rotated and also advanced, the handle 135 of the cover 119 being thrown over so that the bosses 121 will engage the shaft 112 and cause it to advance longitudinally as well as to rotate. y

' The shaft 112 has. as shownin Fig. 8, a

threaded portion 116 and a squared portion' 111, and is driven solely by the engagement ofthe. plate. 107 with the squared end. Obviously therefore if the split nut mechanism engages the shaft until it is so far advanced' that Ythe squared `portion projects entirely" from the breached hole 110 the `result will be that the shaftwill no longer revolve. In

view of this fact the lengths of the portions 111 and 116 have been so determined that after the blade 252 has passed completely through the cylinder being bored the squaredA perder] 111 projects entirely from the hole 110 and the operative action of the machine ceases. Thus the boringis automatically controlled so that while the cylinder is being bored the operatorican busy4 himself velsewhere with the kn'owledgethat the operation will cease when the worlt is finished.

lThe plugs or guides 275 shown in Figs. 15 and 16 are, as pointed out above, absolutely l symmetrical. Fig. 17 however shows the way in which a cylinder 1s loften scored. When ess can new be bored out. This operation can only be perform ed if the'center of the cutter bar be shifted and in order to do so the plugs or guides 275 are made offset, in other Words the fins are machined not from the center of the cylindrical hole 278 but :from another point, the desired distancetwvay. Theolfset plugs are then inserted in the cylinder'with their center line shifted nearer the scored L side of the cylinder and thecenter of the cutter bar will necessarily be equallyshifted so that the material within the circle 288 will be removed, by the rotating blade-252. The location of the cutteribar in the cylinder is determined by the plugs 275 and not by the

permanent guides

281 and 282 which simply hold the bar in the position which has been previously determined for it by the plugs 275. While one embodiment only of my invention has rbeen shownf and describedfI am not to be limited thereby since it is obvious that others could be made without departingvfrom theI spirit and scope of my invention as set forth in t-he following claims.

Having fully describedI my invention, I claim 1. In a machine of the class described, a driving and `feeding shaft, means for rotating said shaft and with reference `tolwhich said shaft is axially slidable, one endy of said shaft being externally threaded, i split nutI mechanism comprising plates on each side of the shaft, springs'A normally separating said plates, an internallythreaded semi-circular boss and a pin projecting from each plate,a guide plate through whichasaid bosses and pinsextendand an oscillatablefcover. plate which bears against said pins and. when oscillated in one direction movesfsaidy plates towardA each other' toengage the shaft and impart a feeding movement thereto.

2. In a machine of the class described, a driving and feedingshaftpmeans for rotat- ,ing said shaft fand withfreferenee to which said shaft is axially slidablc, one end of said shaft being externally threaded, split nut mechanism comprising plates on each side of the shaft, springs normally separating said plates, an internally 4threaded semi-circular boss and a pin projecting from each plate, a stationary guide plate and an oscillatable cover plate, each plate having central openings through which said bosses and pins extend, said pins being held by said spring at all times against the edge of the opening in said cover plate and a handle for oscillating the cover plate to force said pins together and said clutch bosses into engagement with said shaft.

3. In a machine of the class described, a driving and feeding shaft, means for rotating said shaft and with reference to which said shaft is axially slidable, one end of said shaft being externally threaded, split nut mechanism comprising internally threaded clutch plates located about the shaft, springs normally holding said plates out of engagement with said shaft, a pin projecting from each clutch plate, a guide plate through which said pins extend, and an oscillatable cover plate which bears against said pins and which, when moved in one direction, moves said plates toward each other to engage the shaft and impart a feeding movement thereto.

t. In a machine of the class described, split nut mechanism comprising tWo semi-circular plates, springs normally separating said plates, a semi-circular threaded boss on each plate, a pin projecting from each plate, a guide plate having an oval opening for said bosses With diametrically opposed. pockets for said pins, and an oscillatable cover plate having a central opening into Which said pins and bosses extend With the pins always in contact with the sides of the opening, said opening being of a double cam contour so that when the cover plate is oscillated the pins are forced toward each other and the bosses are brought into operative position.

5. As an accessory of a machine of the type described a .fixture for use in finishing the crankshaft bearings of a cylinder block, a finishing bar carried thereby, plates projecting from the back of the fixture and having projecting fingers which provide notches at the ends of said plates in which notches the cam shaft of the cylinder block rests to position the finishing bar so that the crankshaft bearings finished thereby shall carry the crank shaft parallel to the cam shaft, and means for forcing and holding said fixture in such position.

6. As an accessory of a machine of the type described a fixture for use in finishing the crankshaft bearings of a cylinder block, a finishing bar carried thereby, plates projecting from the back of the .fixture and having projecting fingers which provide notches at the ends of said plates in wh ich notches the cam shaft of the cylinder block rests to position the finishing bar so that the crankshaft bearings finished thereby shall carry the crank shaft parallel to the cam shaft, means for forcing said xture into suchA posi-tion, and means for holding the fixture therein.

7. As an accessory of a machine of the type described a fixture for use in finishing the crankshaft bearings of a cylinder block, a finishing bar carried thereby, plates projecting from the back of the fixture and having projecting fingers which provide notches at the ends of said plates in Which notches the cam shaft of the cylinder block rests to position the finishing bar so that the crankshaft bearings finished thereby shally carry the crank shaft parallel to the cam shaft, means for forcing .said fixture into such position and bolts clamping the fixture so positioned to said cylinder block.

8. As an accessory of a machine of the type described a .fixture for use in finishing the crankshaft bearings of a cylinder block, a finishing bar carried thereby, and plates projecting from the back of said fixture to engage the cam shaft of the cylinder block in combination with a bed to Which the cylinder block is secured and threaded means bearing against the bed for forcing said fixture into such. position that the crankshaft bearings formed by the finishing bar Will carry the crank shaft parallel to the cam shaft.

9. As an accessory of a machine of the type described a xtnre for use in finishing the crankshaft bearings of a cylinder block, a finishing bar carried thereby, and plates projecting from the back of said fixture to engage the cam shaft of the cylinder block When the fixture is properly positioned, in combination with a bed to which the cylinder block is secured, threaded means bearing against the bed for forcing said fixture into such position that the crankshaft bearings formed by the finishing bar Will carry the crank shaft parallel to the cam shaft and means for clamping said fixture to .said cylinder block.

10. In a machine of the class described, a driving unit comprising a driving plato formed for driving connection to a crank shaft flange and. having an. axial opening, gearing for rotating said. plate, a shaft having an axially slidable non-rotating fit in said opening and having also a threaded portion, non-rotating feed nut operative to engage or disengage said threaded portion, and manually operated means for controlling the engagement or disengagement of the feed nut.

11. In a machine of the class described a driving unit comprising a rotatable sleeve provided at its outer end With means for driving connection to a crank shaft flange, gearing for driving said sleeve, a casing for said gearing and providing bearings for .said

sleeve7 an axially movable shaft extending through said sleeve and driven thereby, said shaft having a driving end which projects beyond the outer end of said sleeve and also having a threaded portion, a non-rotatable feed nut operative to engage or disengage said threaded portion, and manually operated means for controlling the engagement or disengagement of the feed nut, the latter and said manually operated means being supl0 ported by said easing.

In testimony whereof I aiX my signature.

KIRKE R. WILSON.