AU728770B2 - Abrasive cutting tool - Google Patents

Description

r- 45607DIV GEH:MN P/00/011 Regulation 3.2

AUSTRALIA

Patents Act 1990 COMPLETE SPECIFICATION FOR A STANDARD PATENT

ORIGINAL

aa.

,-'-ULTIMATE ABRASIVE SYSTEMS L L C N. TSELESIN Address for Service: '.COLLISON CO.,117 King William Street, Adelaide, S.A. 5000 Invention Title: ABRASIVE CUTTING TOOL The following statement is a full description of this invention, including the best method of performing it known to us: best method of performing it known to us: jL. t, VW la ABRASIVE CUTTING TOOL BACKGROUND OF THE INVENTION Field of the Invention This invention relates generally to cutting tools, and is more particularly concerned with cutting tools that utilize abrasive particles to effect the cutting action.

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0 Discussion of the Prior Art It is well known in the cutting art, related to such materials as concrete, 10 stone, ceramic, glass, composite materials and the like, to utilize a core such as a disk for a circular saw, a band for a band saw, a link for a chain saw, or strips ,of metal for gang saws, and to affix a plurality of cutting members to the core.

The prior art cutting members typically comprise a matrix material having a S• plurality of diamonds or other hard, abrasive particles embedded therein. It is 15 also known to make the cutting members wider than the core so the core will not bind within the kerf as the cutting progresses. Using the prior art cutting members, however, the cutting members tend to wear in such fashion that the width of the cutting members is reduced as the cutting progresses, causing the kerf to narrow, and reducing the efficiency of the cutting action.

Prior art efforts at resolving the problem with the cutting members has included variations of the cutting members so that more hard particles are in the sides of the member than in the middle so the sides will wear longer to maintain the desired kerf width. Also, various shapes and profiles of cutting members have been devised in an effort to change the wear pattern.

One of the primary difficulties with the prior art cutting members is associated with the fact that the hard particles are not uniformly distributed throughout the matrix material. As one particle is removed from the matrix material during use, support is thereby removed for adjacent particles so adjacent particles are lost without substantial participation in the cutting process. As a result, success of the abovementioned efforts of the prior art to solve the problems associated with the cutting members has been limited.

SUMMARY OF THE INVENTION The present invention provides cutting members to be mounted on a core for use as a cutting tool, the cutting members being made in accordance with the patent nos: 5,190,568; 5,049,165; 4,925,457. By using the mesh material for locating positioning and placing) and supporting the hard particles within the matrix material, there is minimum loss of hard particles during cutting action so that the hard particles are used, rather than simply lost from the cutting member. Furthermore, the cutting members are spaced along the core to provide ample channels for removal of waste and to supply and remove coolant when used. The cutting members in accordance with the present invention may comprise a plurality of shapes and locations to achieve the effect of one cutting member; therefore, the S: 20 total power for driving the cutting device is reduced, channels for providing coolant and removing coolant and debris are increased, and opportunity is provided to have a greater number of cutting members for some purposes than for others.

According to one form of the invention there is provided a cutting tool including a Socore, a working edge of said core and a plurality of cutting members structurally 25 independent of said core and shaped to be fixed to said core, each of said cutting lmembers being cut out from a sheet of an abrasive material including a sintered retaining matrix material having a plurality of abrasive particles embedded therein, said particles being orderly distributed in a non-random pattern in the matrix material by means of a mesh material, and each of said cutting members being fixed to and arranged along said working edge of said core for engaging a Tworkpiece and cutting a kerf therein having a bottom and opposed sides, said core having first and second sides extending perpendicular to and on either side of said edge, each of said cutting members having at least a portion extending beyond at least one of said first and second sides of said core in a direction normal thereto and being fixed to said core so that the members engage opposed sides of the kerf and act as gauge keeping members, said cutting members further including a stock removal portion for engaging the bottom of said kerf, said cutting members being fixed to said core so that the stock removal portion of said members having a width extending along the working edge of said core, the effective total width of said stock removal 1 0 portions of the cutting members being substantially equal to the width of said kerf.

In a preferred form of the invention each of said cutting members has a first portion extending beyond the first side of said core in a direction normal thereto and a second portion extending beyond the second side of said core for engaging the opposed sides of the kerf and acting as gauge keeping members, 1 5 said cutting members further including a stock removal portion between said first and second portions for engaging the bottom of said kerf, said stock removal portion having a width extending along the working edge of said core, the effective total width of said stock removal portion of the cutting members being substantially equal to the width of said kerf.

2 0 In a preferred form of the invention the cutting tool includes a plurality of first and l. second portions in each cutting members, wherein said plurality of first portions .define first channels therebetween, and said plurality of second portions define second channels therebetween.

In a preferred form of the invention the cutting tool includes a pair of members 25 extending generally parallel to each other which together provide said portions for each cutting members, and further including a filler between said pair of members.

In a preferred form of the invention the stock removal portion has a zig-zag configuration to provide said effective total width.

ST 3 0 In a preferred form of the invention the mesh material is incorporated in said sheet S t of abrasive material and is a part of said cutting members.

I. .6 4 In a preferred form of the invention the sheet of abrasive material is a corrugated sheet.

In another form of the invention there is provided a method for manufacturing an abrasive cutting tool from an abrasive material workblank which workblank includes a sintered retaining matrix material having a plurality of abrasive particles embedded therein that at least some of which have been orderly distributed in a non-random pattern in the matrix material by means of a mesh material, said method including the steps of providing a sheet of said abrasive material workblank, cutting out said sheet into a plurality of cutting members shaped to be fixed to a core of a cutting tool, and fixing said plurality of cutting members to said core.

In a preferred form of the invention the step of cutting out said sheet includes cutting said sheet by means of laser cutting, water jet cutting, electrical erosion cutting or 1 5 combinations thereof; In a preferred form of the invention the sheet is cut out to provide said cutting members by laser cutting.

In a preferred form of the invention the plurality of cutting members are fixed to the core by welding, laser welding, brazing, gluing, or combinations thereof.

2 0 In a preferred form of the invention the mesh material is incorporated in said abrasive material workblank and is part of said cutting members.

According to another form of the invention there is provided a cutting tool made by S• •the abovementioned method.

According to another form of the invention there is provided a cutting tool made by S 2 5 the abovementioned method.

BRIEF DESCRIPTION OF THE DRAWINGS TR These and other features and advantages of the present invention will become S apparent from consideration of the following specification when taken in S1 n C conjunction with the accompanying drawings in which: Fig.1 is a fragmentary side elevational view showing a circular saw having cutting members made in accordance with the present invention mounted thereon; Fig.2 is an enlarged cross-sectional view taken substantially along the line 2--2 in Fig.1; Fig.2A is similar to Fig.2 but showing a modified form thereof; Fig.3 is a cross-sectional view taken substantially along the line 3--3 in Fig.1; Fig.3A is similar to Fig. 3 but showing a modified form thereof; Fig.4 is an enlarged cross-sectional view taken substantially along the line 4--4 S in Fig.1; •Fig.4A is similar to Fig.4 but showing a modified form thereof; Fig.5 and 6 are cross-sectional views similar to Figs.2 and 4, but showing a ::modified form of cutting member; 15 Figs. 7--9 are similar to Figs.2--4 but show another modified form of cutting member; Figs.10--12 are similar to Figs.2--4 but showing another modified form of cutting •member; 20 Fig.13 is a top plan view showing a circular saw having a different form of 20 cutting members mounted thereon; Fig.14 is a perspective view showing a cable saw made in accordance with the present invention; S° Fig.15 is a side elevational view showing a modified form of the saw shown in Fig 14; S 25 Fig. 16 is a perspective view showing a block of contoured material as disclosed in the above identified application Serial. No. 741,678; Fig. 17 is a plan view of the block shown in Fig. 16, and illustrating shapes to be cut from the block; Figs. 17A 17B and 17C illustrate cutting members formed from pieces cut from the block shown in Fig. 17; Fig. 18 is an elevational view showing the cutting edge of a tool made in accordance with the present invention; Fig. 19 is a front elevational view of a cutting segment made in accordance with the present invention and adapted for subsequent mounting on a core; Fig. 20 is a fragmentary view showing a plurality of cutting members made in accordance with the present invention and subsequently molded into a core; Fig. 21 is a fragmentary perspective view showing a modified form of cutting I. 6 member made in accordance with the present invention; and, Figs. 22 and 23 are fragmentary views similar to Fig. 18 and showing different modifications thereof.

DETAILED DESCRIPTION OF THE EMBODIMENTS Referring now more particularly to the drawings, and to those embodiments of the invention here presented by way of illustration, it should be understood that the hard-particle-containing material utilized in the present invention is a material such as that disclosed in U.S. Patents Nos. 4,925,457, 10 5,092,910 and 5,049,165. The material may be made in accordance with the .teachings in U.S. Patent No. 5,203,880 and, the material may conform to that disclosed and claimed in Patent No. 5,190,568. The present invention relates o to novel tools utilizing the material disclosed in these applications and patents,and such material will be referred to as mesh material regardless of whether the mesh is an integral part of the composite abrasive material or was removed. However, it should be understood that the present invention may utilise practically any composite abrasive materials (made by mixing, coating and/or agglomeration of abrasive particles with retaining media, sintering, impregnating, curing, gluing, plating, brazing, fusing, depositing, implantation 20 etc., or by an combination of these and other techniques). The success in the utilization of this material is directly associated with concentration, uniformity of 0 •distribution of abrasive particles in the matrix material, and with the degree of retention of the abrasive particles in the matrix material. The higher the degree of concentration, uniformity and retention, the more successful will be the utilization of the composite materials in the present invention.

Fig.1 of the drawings shows a circular saw including a core 25 having a plurality of cutting members fixed to its periphery. Those skilled in the art will understand that it is well known in the art to fix cutting members to the periphery of a core 25; but, the cutting members themselves are unique in the present invention. The readily recognized difference is that the cutting members comprise different profiles which are distributed along the periphery, and the other difference is that the cutting members comprise the above discussed mesh material.

6a From Fig. 1 it will be seen that there are three different profiles of cutting member, the profiles being designated at 26, 28 and 29 which are shown respectively in Figs. 2, 3 and 4. It will be noticed that there are two successive members 28, and this will be discussed further below.

The cutting member 26 is secured to one side of the 000e

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core 25, and is substantially aligned with the peripheral edge 30 of the core 25. As a result, the member 26 will cut only the side of the kerf, acting as a gauge keeping member. The cutting member 29 is secured to the opposite side of the core 25, and is essentially the mirror image of member 26. Thus, the member 29 cuts only the opposite side of the kerf.

The cutting member 28 is mounted on the peripheral edge 30 of the core 25, and is used for stock removal, 10 acting at the bottom of the kerf. It will be noticed that the member 28 has a width equal to the sum of the widths of the member 26, the core 25 and the member 29.

The cutting member 28 will cut material to provide a kerf; and, as the core 25 moves into the kerf, the S" 15 members 26 and 29 act as gauge keeping members to maintain the kerf width and assist in protecting the ends 31 and 32 of the stock removal member 28.

Since the cutting member 28 is used for stock S* removal, one might place more of the members 28 on the 20 core 25 than the members 26 and 29. Thus, as is shown in Fig. 1, there is a member 26, followed by two of the *members 28, then one member 29, and the sequence will be repeated throughout the periphery of the core 25. A variation of this design is shown in Figs. 2A, 3A, and 4A. The cutting member 28' has a width approximately equal to the width of the core 25 and the cutting members 26' and 29' cover sides of cutting member 28'.

This design provides extra protection against side wearing tool. It should be noticed that members 26, 26' and 29, 29' may have different abrasive particles and concentrations from members 28 and 28'. In most cases, members 26, 29, 26' and 29' will include smaller abrasive particles than members 28 and 28'. This provides smoother surfaces of the cut workpiece.

Though the core 25 shown in Fig. 1 is circular, it should be understood that, using other cores, the use 8 and function of the cutting members 26, 28 and 29 will be the same. Thus, one might place the cutting members along the working edge of a band saw, along the edges of chain saw links, along the edges of gang saws, or even along the working edges of a hole saw, the working edges of a drill or a drill bit. References herein to a core are to be understood in this broad sense.

Considering the operation of the device shown in Figs. 1--4A of the drawings, it will be understood that there will be a plurality of stock removal members 28, 28' distributed along the periphery of the core 25, the members 28, 28' being S1 0 formed of mesh material to locate or position, and/or to retain hard particles within the matrix material. The members 28, 28' may also be formed of other S. abrasive materials wherein a plurality of abrasive particles is distributed tightly and uniformly on the retaining surface. The usual depreciation of a cutting member is in rounding of the corners of the member. First, the use of the S 1 5 mesh material retards loss of hard particles at the corners; and, the gauge members 26, 26' and 29, 29' assist in maintaining the full kerf. Between each the members 26, 28 and 29, or 26', 28' and 29' there is a space which .allows easy removal of debris, and may allow for flow of coolant when used.

The cutting members 26, 28 and 29 can be placed separately on a designated S 2 0 tooth of the core Looking next at Figs. 5 and 6 of the drawings, the core is designated at S• and the cutting members are designated at 34 and 35. As in the previously described embodiment, the members 34 and 35 are distributed along the working periphery of the core 2 5 One form of prior art cutting member is arranged so that the outside edges cut first, to yield a V-shape at the bottom of the kerf. The purpose of the V-shape is to keep the cutting device running true, and straight in the kerf. The arrangement shown in Figs. 5 and 6 is similar, but the V-shape is formed by two separated pieces. The cutting member 34 is angled so the inner end 36 will act largely as a gauge keeping surface while the outer end 38 will be used for stock removal.

Similarly, the cutting member 35 is angled in the opposite direction and the inner end 39 acts largely as a gauge keeping surface while the outer end 40 will be i0 used primarily for stock removal. It should be understood that the arrangement of the cutting members *0*4 S" is not limited to a V-shape, but it an be an X-shape, L-shape etc.

The cutting members 34 and 35 will be distributed Sa• 15 along the periphery of a core 25a as shown in Fig. 1; therefore, the above discussed advantages are realized in the flow of coolant and the removal of debris.

Attention is directed to Figs. 7--9 of the drawings which show another modification of the device shown in 20 Figs. The core is designated at 25b, and the three cutting members are designated at 41, 42 and 44.

In this embodiment of the invention, the member 41 includes a portion 45 at the periphery of the core and a portion 46 at the periphery of the side of the core. Thus, the member 41 both removes stock with the portion 45 and holds the gauge with the portion 46.

The cutting member 42 is substantially at the periphery of the core 25b and is used for stock removal. The final member 44 is the opposite of the member 41 and has a portion 45' for stock removal and a portion 46' for gauge keeping.

It will thus be seen that the members shown in Figs.

7--9 provide three members for stock removal to one gauge keeping member on one side of the core, and one gauge keeping member on the other side of the core.

Additionally, since maintenance of a proper kerf with square corners is difficult, this device provides a kerf with a rounded bottom.

While the cutting member is not as efficient when the cutting edge is rounded, maintenance of the kerf is easier, so the long-term efficiency is improved.

Figs. 10--12 illustrate another variation of the arrangement shown in Figs. 7-- 9. The core is designated at 25c, and the cutting members are designated at 48, 49 and 50. Each of the members 48, 49 and 50 is semicircular, but they are oriented differently with respect to the core The member 48 is secured at one side of the core 25c, with the straight portion 10 51 of the semi circle parallel to the side of the core 25c. As a result, one end of the circumference is adjacent to the periphery 52 of the core 25c and will provide some stock removal, while the central portion of the circumference will act as a gauge keeping surface.

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The member 49 is secured to the periphery 52 of the core 25c with the straight 1 5 portion 51' of the semicircle perpendicular to the sides of the core 25c. Thus, the center portion of the semicircle will provide for stock removal while the :diametrical ends of the side 51' will provide gauge keeping.

Finally, the member 50 is similar to the member 48 but is fixed at the opposite side of the core 25c. The straight side of the semicircle is designated at 51", 0 0 20 and the function will be understood from the discussion of the member 48.

0* Fig. 13 of the drawings shows another modification in accordance with the present invention. The device shown in Fig. 13 is similar to that shown in Figs.

and 6. In Figs. 5 and 6, the cutting members 34 and 35 are placed generally tangentially to the core 25a, then angled to one side or the other of the core.

2 5 In Fig. 13, the cutting members 54 are placed obliquely, so the 1a 11 members 54 lie along a secant of the core 25d, and are then angled with respect to the secant. As illustrated, successive cutting members 54 can be angled in opposite directions so that the leading edge is successively on the right and left sides of the core As a result of the placement of the cutting members 54, only an edge of the members will engage the work piece to effect the cutting. As the cutting members 10 wear away, other portions of the members will contact the work piece. Thus, the cutting members 54 will work effectively until virtually the entire member has been used. All the while, only a small area of each member 54 will contact the work piece, so the power consumption is minimized, and the channels for removal of debris are kept open.

Attention in next directed to Figs. 14 and 15 of the drawings. Both these figures illustrate saws made by attaching a plurality of cutting members to a flexible 20 cable or the like.

.In Fig. 14, there is a flexible cable 55, the cable having spaced therealong a plurality of cutting members 56 and 58. All the members 56 and 58 are substantially alike, but the two groups are oriented in opposite directions. The cutting members 56 and 58 are frustoconically shaped, and the members 56 have their bases directed to the left in the drawing, while the members 58 have their bases directed to the right.

Such an arrangement will provide equal cutting regardless of the direction of motion of the cable An alternative arrangement is shown in Fig. 15. The .cable 55a has a plurality of cutting members 56a spaced therealong, all the members 56a having their bases directed to the left. The cutting action may tnerefore be somewhat different, depending on the direction .f movement of the cable From the above and foregoing description it will be understood that the cutting members 56, 58 and 56a will have at least their surfaces formed of abrasive composite materials which may comprise mesh material as discussed hereinabove. As a result, the members will cut aggressively with a minimum loss of hard particles; and, as the cutting edge is worn away, the adjacent area of the surface will come into play as the cutting edge. This process will continue until the entire cutting member has been used.

Fig. 16 of the drawings shows a piece of material as disclosed in the above 10 Patent No. 5,190, 568, the material being designated generally at 59 and o° having undulations 60. The same material 59 is shown in Fig. 17, and various Ole: ,oo shapes to be cut from the material 59 are indicated in broken lines. For example, the cutting members 41, 42 and 44 as shown in Figs. 7-9 are shown *o in Fig. 17 to illustrate one technique for producing such members. Also, the members 48 and 49 are shown, and members 26 and 28 are shown. The material 59 may be made in accordance with the technique disclosed in U.S.

00 Patent No. 5,203,880, may represent a simple arcuate) piece or a complicated contoured piece, and may be cut by a laser or the like to provide S cutting members as disclosed herein.

e 20 Fig. 17 also shows a piece 57 to be cut from the material 59, and it will be noticed that the orientation is such that the length of the piece 57 extends across the undulations, or corrugations, 60. Uses of the resulting piece 57 are shown in Figs. 17A, 17B and 17C.

In Fig. 17A, the cutting member is designated at 57a, and it will be seen that the contoured surface is oriented to be perpendicular to the kerf wall, so the contoured surface is used for stock removal at the 13 bottom of the kerf. The side of the piece 57a are of course in a zig-zag path for maintenance of the wall of the kerf.

The cutting member 57a is fixed to a core 25e by welding or by other known techniques; and as here shown a filler is used between the member 57a and the core Fig. 17B illustrates a cutting member 57b rotated 900 from the member 57a.

Thus, the zig-zag surface of the member effects stock removal at the bottom of the kerf while the contoured surfaces act as gauge keeping surfaces. The 1 0 member 57b is fixed to the core 25f by standard techniques.

S. The arrangement shown in Fig. 17C is a combination of those shown in Figs.

17A and 17B in that two pieces 57c and 57d are fixed to the core 25g. The piece 57d is fixed directly to the core 25g similarly to the piece 57b, so the contoured surfaces act as gauge keeping surfaces. However, the piece 57c is 1 5 fixed to the zig-zag surface of the piece 57d, so the contoured surface of the piece 57c engages the bottom of the kerf to effect stock removal. A filler may :be used between the piece 57c and the piece 57d as illustrated. The filler may comprise a plurality of abrasive particles.

It will be understood by those skilled in the art that an assembly such as that 20 shown in Fig. 17C can be separately assembled, and the filler may be S• sintered and/or fused, and/or brazed, then the assembly subsequently fixed to a core.

Fig. 18 of the drawings shows a cutting edge of a cutting device. The device shown in Fig. 18 may be the edge of a portion of a band saw or a gang saw, or 2 5 may represent a straightened edge of a circular saw. The gross conformation of the cutting device is not important. In Fig. 18, there is a core 61 having two undulating cutting members 62 and 64 fixed thereto. As shown in Fig. 18, the cutting members 62 and 64 include arcuate portions 65 connected by straight portions 66. The arcuate portions 65 have their ends fixed to the core 61, and 3 0 the arc extends out beyond the core itself. The straight portions 66 connect the ends of the arcuate portions, and of course provide additional abrasive material to assist in the cutting.

14 The arcuate portions 65 may be formed as discussed above, the portions being shown in Fig. 17 by way of illustration. It will therefore be understood that the edges shown in Fig. 18 will act as cutting edges, for stock removal, while the curved sides of the portions 65 will assist in gauge keeping surfaces.

It should be understood that the portion 66 may have an arcuate shape as well.

Fig. 19 illustrates a cutting member similar to that shown in Fig. 11; but, the cutting member shown in Fig. 19 is adapted to be made and mounted for ease 1 0 in subsequent securement to a core. As here illustrated, the cutting member m68 is fixed to a mounting member 69. The mounting member 69 is U-shaped to fit over a core 70, though it will be understood that numerous other shapes S.can be used. As here shown, the mounting member 69 can be easily ***:attached to the core 70 by tack welds, including welds made by laser.

*oo S 1 5 Fig. 20 shows a modification of the arrangement shown in Fig. 19. In Fig. there are cutting members 71 formed in one of the ways discussed in the above identified patent applications or patents, the members 71 being formed with anchors 72 integral therewith. The core 74 may be a resinous material, composite materials, or metal, so long as the segments 71 are not damaged 2 0 by the molding process.

Fig. 21 shows a fragmentary portion of a circular saw blade, but the conformation is not limited to circular saws. The device in Fig. 21 is formed by placing two pieces of corrugated material together, and the result is a central, discontinuous web 75 with interspersed tubular members 76. From the above 2 5 discussion, it will be realised that this configuration provides cutting along the edge 78, while the sides 79 of the tubular members 76 act as gauge keeping surfaces. Further, debris can be removed in the valleys 80 between the tubular members 76 as well as through the openings 81 in the tubular members 76. Coolants and/or lubricants can be supplied through the 3 0 openings 81 and valleys The structure illustrated in Fig. 21 is further usable as a grinding member. The sides 79 of the tubular members can act as the stock removal portion of the device, while the valleys 80 allow removal of debris. The shape of the device when used as a grinding device may be almost infinitely varied; and, whether used as a cutting or grinding device, the tubular members 76 may be generally rectangular as shown, or may be round, elliptical or polygonal.

A plurality of the structures illustrated in Fig. 21 can be put together in such a way as to provide greater thickness of the tool. In this case, honeycomb-like structures of abrasive materials are formed. This structure can be formed by direct manufacture, or by manufacturing contoured parts and subsequently assembling the parts by brazing, fusing, gluing or welding. The welding can 1 0 include laser and electron beam welding as well as the more conventional *techniques. The resulting structures can be used in grinding wheels, routers, reamers, drills and the like. A honeycomb surface may perform stock removal Soand/or gauge keeping functions. The openings 81 can be used to deliver coolants, lubricants or surface-active material, such as neutral or reducing gas 5 to the working zone. Further, the openings 81 and/or valleys 80, can be filled *with a variety of materials, including solids, porous or powdered materials, pastes and plastic materials, fabrics, advanced composite materials and the S: like, and combinations of any of such materials. The materials can function as a lubricant molybdenum disilicide, graphite, glass) as a carrier for a 20 lubricant or other medium to be delivered to the working zone, and as a reinforcement of the honeycomb structure.

Fig. 22 illustrates a variation to the arrangement shown in Fig. 18. In Fig. 22, the cutting members 82 and 84 are formed of straight segments, but the general conformation is the same as in-Fig. 18. Additionally, there is a filler 2 5 between the two cutting members 82 and 84. There may also be a filler 86 in the valleys of the cutting members, fixed to the core 88. The fillers 85 and 86 are partially broken away to show the core 88. The fillers can include abrasive particles of the same or different nature, size and concentrations as in the cutting members 82 and 84. The member 84 may have a round shape 3 0 similar to that shown in Fig. 18. The member 84 can be eliminated and the member 82 will form a contoured surface.

Fig. 23 illustrates a cutting member that can be thought of as a variation of the device shown in Fig. 18, or the device shown in Fig. 22. In Fig. 23, the individual shapes to form the cutting member are as shown at 65 in Fig. 17; 16 however, the pieces are substantially centered on the core. The core in Fig.

23 is designated at 90, and the cutting members are designated at 91, 92 and 94.

Whereas the pieces 65 in Fig. 18 have their ends on the core and the arcuate portions extending beyond the sides of the core, the pieces 91, 92 and 94 are substantially centered on the core 90, with the ends at one side of the core and the arcuate portion at the other side of the core 90. Further, successive pieces o •o •o/ o/ 17 are reversed with respect to the immediately preceding piece. Thus, the members 91 and 92 have their ends at one side of the core 90, while the member 94 has its ends at the opposite side of the core 90. It should be understood that the ends of members 94 can be positioned within members 91 and 92.

It will therefore be understood that the arrangement shown in Fig 23 provides, effectively, a zig-zag **pattern on the stock removal surface of the cutting 10 member, though the zig-zag pattern is discontinuous.

While the specific features are different, the general operation is substantially the same as for the devices shown in Figs. 18 and 22. In all cases, there is a zig-zag pattern for stock removal and a contoured 15 surface for gauge keeping.

S*0 It will therefore be seen that the present invention provides cutting members that provide efficient cutting, and maintain kerf width while making minimum power demands. The cutting members are designed to be long lasting for full use of the diamonds or other hard particles utilized in the cutting members.

It will of course be understood by those skilled in the art that the particular embodiments of the invention here presented are by way of illustration only, and are meant to be in no way restrictive; therefore, numerous changes and modifications may be made, and the full use of equivalents resorted to, without departing from the spirit or scope of the invention as outlined in the appended claims.

Claims (6)

1. A cutting tool including a core, a working edge of said core and a plurality of cutting members structurally independent of said core and shaped to be fixed to said core, each of said cutting members being cut out from a sheet of an abrasive material including a sintered retaining matrix material having a plurality of abrasive particles embedded therein, said particles being orderly distributed in a non- random pattern in the matrix material by means of a mesh material, and each of said cutting members being fixed to and arranged along said working edge of said core for engaging a workpiece and cutting a kerf therein having a bottom and opposed sides, said core having first and second sides extending perpendicular to and on either side of said edge, each of said cutting members having at least a portion extending beyond at least one of said first and second sides of said core in a direction normal thereto and being fixed to said core so that the members engage opposed sides of the kerf and act as gauge keeping members, said cutting members further including a stock removal portion for engaging the bottom of said kerf, said cutting members being fixed to said core so that the stock removal portion of said members has a width extending along the working edge of said core, the effective total width of said stock removal portions of the cutting 20 members being substantially equal to the width of said kerf.

2. The cutting tool of claim 1, wherein each of said cutting members has a first portion extending beyond the first side of said core in a direction normal thereto and a second portion extending beyond the second side of said core for engaging the opposed sides of the kerf and acting as gauge keeping members, said cutting 25 members further including a stock removal portion between said first and second portions for engaging the bottom of said kerf, said stock removal portion having a width extending along the working edge of said core, the effective total width of said stock removal portion of the cutting members being substantially equal to the width of said kerf.

3. The cutting tool of claim 2, including a plurality of first and second portions in each cutting member, wherein said plurality of first portions define first channels therebetween, and said plurality of second portions define second channels X therebetween. 19

4. The cutting tool of claim 1, including a pair of members extending generally parallel to each other which together provide said portions for each cutting member, and further including a filler between said pair of members.

5. The cutting tool of claim 1, wherein said stock removal portion has a zig- zag configuration to provide said effective total width.

6. The cutting tool of claim 1, wherein the mesh material is incorporated in said sheet of abrasive material and is a part of said cutting members. Dated this 20 th day of October 2000 ULTIMATE ABRASIVE SYSTEMS, L.L.C. By their Patent Attorneys COLLISON CO **a *o S