WO2002009902A1

WO2002009902A1 - Saw blade for a coping apparatus

Info

Publication number: WO2002009902A1
Application number: PCT/US2001/023700
Authority: WO
Inventors: Martin Scott; William C. Shaw
Original assignee: Shaw Millwork Inc
Current assignee: Shaw Millwork Inc
Priority date: 2000-07-31
Filing date: 2001-07-30
Publication date: 2002-02-07
Anticipated expiration: 2003-01-31
Also published as: AU2001283009A1

Abstract

A saw blade (12) has teeth (150) with three cutting edges and a width greater than the width of the saw blade (12).

Description

SAW BLADE FOR A COPING APPARATUS

BACKGROUND OF THE INVENTION

This application is a continuation-in-part of U.S. Patent No. 6,095,726, which is hereby incorporated by reference herein in its entirety.

1. Field of the Invention

This invention relates broadly to a saw blade for cutting wood. More particularly, the present invention relates to a saw blade adapted to cut laterally from either side and useful in a coping apparatus which accurately copes molding by using a stylus to follow a template and directs the saw blade to cope a piece of molding by movement of the stylus along the template.

2. State of the Art

Molding is often provided to the walls of a room to provide an attractive border to the room. Molding along the wall adjacent the floor is called baseboard molding. Molding along a central portion of the wall is called chair rail molding, often used to prevent the back of a chair from scraping and scarring the wall. The molding provided around a ceiling is referred to as crown molding and is often applied between the wall and ceiling at an angle such that the profile, or contoured pattern, of the face side of the molding is directed into the room. Coping is the process whereby the end of one piece of molding is shaped to seat flushly against the face of another piece to ensure that the two pieces of molding fit together properly (thereby having an attractive appearance) when joined at an inside corner.

In general, coping requires the laborious process of first forming a traced outline of a negative image of the profile of the molding, and then using a hand-held coping saw to cut about the end grain of the molding along the traced outline so that the end of the molding has the negative profile of the molding. With respect to crown molding, the coping process is further complicated by the respective angle relative to the wall and ceiling at which two pieces of corner molding are applied to the wall and ceiling. Because most walls do not intersect at exactly ninety degrees due to imperfections in the wall construction or warping of wood, it is desirable to 'undercut' the molding; that is, remove excess wood from the rear of the molding along the traced outline, to provide a back clearance. The undercut compensates for the likelihood that the wall corners are not true, and permits the coped piece of molding to meet the face of the other piece of corner molding so that the coped end can seat flush against the face side of the adjoining piece of molding without interference from the back of the molding.

The procedure of coping molding is an exacting process, requiring a high degree of care and the skills of an experienced carpenter. Moreover, the process is time consuming. As each corner requires a piece of molding to have a negative image of the profile of the molding cut into its end and checked for fit, and, quite often, modified one or more times, coping creates high demands on skilled labor resources.

U.S. Patent No. 5,363,732 to Heasley discloses a coping apparatus which is designed to replace the hand cut method of coping and which purports to simplify and expedite the coping of molding. The device includes a circular saw blade having teeth set to one side driven by a motor and mounted on a movable mount, a pin-like stylus also coupled to the mount, a vertical clamp which holds a piece of molding by placing pressure on the face of the molding, and a support for holding a relatively flat template. A piece of molding is placed in the vertical clamp with the end to be coped facing the saw blade, and the stylus is moved about a template held in the support. The stylus is moved in one direction along the template and causes a corresponding movement of the saw blade through the wood. The saw blade may also be tilted, ostensibly to cut crown molding. The Heasley device is beset by a number of serious drawbacks which prevent its operation as described. First, while the Heasley device requires the use of templates, the Heasley device does not enable the construction of a template. It will be appreciated that a template which simply has the profile of the molding will not correctly guide the saw blade, as the saw blade is round and will cut the molding at an offset related to the height of the molding. However, the height of the molding varies across its face. Only where the molding is relatively minimal in thickness, e.g., at its edges, will the Heasley device accurately reproduce the profile of the face of the molding on the coped end. Otherwise, the Heasley device provides no means of compensating for the offset, and as a result, the device will not produce the desired profile off a template. Second, the round saw blade of the Heasley device which cuts from one side is ill-equipped to cope left and right inside corners of the molding profile as can be done by a standard hand coping saw. Third, the clamp provided by Heasley to secure molding being coped will deform the face of the molding. Fourth, contrary to Heasley' s description of his coping device, it has been found that the Heasley device is not able to cope crown moldings with the use of template.

SUMMARY OF THE INVENTION

It is therefore an object of the invention to provide a device that will quickly, simply, and accurately make a template and cope molding.

It is another object of the invention to provide a coping device that can cope crown molding.

It is a further object of the invention to provide a coping device that uses templates that are easy to create in the field and which permit the accurate reproduction of a negative image of the profile in the coped end. It is also an object of the invention to provide a coping device having a saw blade that can approach and cut left and right inside corners in the end of a piece of molding.

It is an additional object of the invention to provide a coping device that guarantees proper alignment.

In accord with these objects, which will be discussed in detail below, a coping device for coping a piece of molding is provided. Generally the coping device includes a circular cutting means rotatable about an axis' for cutting into an end of the piece of molding, a template having an end provided with a coped profile, a stylus which traces the coped profile of the template and which preferably has substantially the same width and radius of curvature as the cutting means, clamping means for respectively securing the molding and the template in a fixed position, and a base having a stationary portion and a movable portion movable in X and Y directions relative to the stationary portion. The clamping means are coupled to the stationary portion, and the cutting means and the stylus are both coupled to the movable portion. Thus, the cutting means and the stylus are substantially simultaneously movable relative to the clamping means so that the molding can be coped with the cutting means as the stylus traverses the coped profile of the template.

According to a preferred aspect of the invention, while the cutting means and the stylus are tiltable to the same angle when coping, they are each independently tiltable, preferably to any angle between 0° and 60° left and right. According to yet another preferred aspect of the invention, the template is a piece of molding manually cut on the device of the invention and then used as a template. It will be appreciated that the template may later be installed as any other piece of coped molding. Moreover, it is also preferable that the clamping means comprises two clamps, one for the template and one for the molding to be cut. The two clamps are adjustably referenced relative to the stylus and the cutting means, respectively, and provide both lateral and downward clamping forces on the lateral edges of the template and the molding to hold each securely. The clamping forces are directed against the molding such that neither the template nor the molding are visibly marred by the clamps .

According to a preferred embodiment of the invention, the cutting means is a saw blade adapted to cut laterally from either side. The saw blade includes a first plurality of teeth wider than the width of the blade body, and preferably oriented at a positive hook angle. The teeth are either faceted to approximate a radius better than the edge of the blade itself, or provided with an actual radius. Where facets, rather than a true radius, are provided, each facet preferably meets an adjacent facet at an angle greater than 90°. The approximation of the radius is permissible because the saw blade cuts mostly from the side, and desirable because the edge of the blade is thereby better adapted to more closely follow the path of a stylus of a coping device, according to one preferred use of the blade. The teeth preferably have a constant width along their length radially inward of the facets. Optionally, a second plurality of strobe teeth, preferably at no hook angle, are also provided to the blade which overlap the perimeter teeth. When no strobe teeth are used, it is preferable that at least one of the first plurality of teeth be extended relative to others .

In coping a piece of molding using the apparatus of the invention, the end of a piece of molding is cut at an angle, e.g., 45° off a perpendicular from a face of the molding, such that the angled end has an edge which outlines the profile of the molding. Preferably the edge is colored to form a dark outline of the profile. The molding is then clamped in the clamp situated in front of the cutting means. If the molding is a crown molding, the cutting means is oriented to the appropriate angle relative to the ceiling angle of the molding. Next, by eye, the cutting means is moved on the movable portion of the base in the X and Y directions such that the cutting means removes the edge of the molding within the dark outline to form a coped profile. This 'manually' cut piece of molding becomes the template for the coping device. The template is next moved to and secured within the clamp situated in front of the stylus, and another piece of molding is secured in the clamp in front of the cutting means. If the molding is a crown molding, the stylus is oriented to the angle of the cutting means. Then, with the cutting means operating, the stylus is guided to trace the coped profile consequently causing the cutting means to cut the end of the molding in front of the cutting means. Other pieces of molding may be similarly coped.

It will be appreciated that because the stylus preferably has the same radius as the cutting means and because both the stylus and cutting means can be tilted, the stylus can accurately track the profile of the template and direct the cutting means to accurately cope the end of the molding without imparting an undesirable offset to the profile of the molding. In addition, because the cutting means is round and will cope the molding along a radiused curve, it automatically provides a desirable undercut to the coped end of the molding provided the cutting is properly vertically aligned relative to the molding. Furthermore, because the clamps are referenced relative to the cutting means and the stylus, the profile imparted to the end of the coped molding will be accurately provided; i.e., aligned along the width, to the molding. Moreover, because the cutting means can laterally cut from two directions, it can be used to cope substantially any molding profile which is otherwise copeable by hand.

Additional objects and advantages of the invention will become apparent to those skilled in the art upon reference to the detailed description taken in conjunction with the provided f gures .

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a top view of a coping device according to the invention; Figure 2 is a broken side view of the coping device of Figure 1;

Figure 3 is a broken partial front view of the coping device of Figure 1;

Figure 4 is view similar to Figure 3 with the cutting means and stylus tilted relative to vertical;

Figure 5 is a broken side view of the stylus and preferred cutting means of the coping device of the invention;

Figure 6 is a broken top view of the cutting means shown in Figure 5;

Figure 7 is a broken top view of the stylus shown in Figure 5 ;

Figure 8 is a broken front view of the coping device of Figure 1;

Figure 9 is a broken front view of the template clamp with a template provided therein.

Figures 10, 11 and 12 illustrate the method of coping baseboard molding and chair rail molding according to the invention;

Figures 13, 14, and 15 illustrate the method of coping crown molding according to the invention; and

Figure 16 is a side view of a second embodiment of the cutting means of the invention;

Figure 17 is a broken top view of the cutting means shown in Figure 16; Figure 18 is a view similar to Fig. 5 showing a second preferred cutting means of the coping device of the invention; and

Figure 19 is a broken top view of the cutting means shown in Figure 18.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

Turning now to Figures 1 and 2, a coping device 10 for coping a piece of molding generally includes a circular cutting means 12 , a power means 13 to drive the cutting means 12 , a guiding means 14 including a stylus 15, a template clamp 16, a molding clamp 18, and a base 20 having a stationary portion 22 and a movable portion 24 movable in X and Y directions relative to the stationary portion. The clamps 16 and 18 are coupled to the stationary portion 22, as described in detail below. The cutting means 12 and the guiding means 14 are coupled to the movable portion 24 such that the cutting means and the guiding means are substantially simultaneously movable relative to the clamps 16, 18, as also described in detail below. A template having a coped profile, the construction of the template being described below, is secured in the template clamp 16, while a piece of molding to be coped is secured in the molding clamp 18. As will also be described in detail below, as the stylus 15 is traversed across the coped profile of the template, the cutting means 12 copes the piece of molding in the molding clamp.

More particularly, the stationary portion 22 of the base 20, which generally comprises a preferably rectangularly shaped frame, has front and rear low friction rods 32, 34. The movable portion 24 includes front and rear elongate bearing collars 36, 38 which slidably extend over the front and rear rods 32, 34, respectively. The front and rear elongate bearing collars 36, 38 have lateral coupling portions 40, 42, and 44, 46, respectively. The movable portion 24 also includes first and second low friction rods 48, 50 extending from the front rod 32 to the rear rod 34. The front end 52, 54 of the first and second rods 48, 50 are coupled in the coupling portions 40, 42 of the front elongate bearing collar 36, and the rear end 56, 58 of the first and second rods 48, 50 are coupled in coupling portions 44, 46 of the rear elongate bearing collar 38. As a result, the first and second rods 48, 50 may be laterally slidably moved over the front and rear low friction rods 32, 34 on the front and rear bearing collars 36, 38.

To facilitate movement in a second (front-back) direction, first and second elongate bearing collars 60, 62 are provided to slidably extend over the first and second rods 48, 50, respectively. Handle 64, 66 are provided to the first and second elongate bearing collars 60, 62. The first and second elongate bearing collars 60, 62 are rigidly coupled together by a rear cross plate 68 and a front cross bar 70. Providing force to the handles 64, 66 permits the first and second elongate bearing collars 60, 62 to be moved in the X and Y directions on the front and rear rods 32, 34 and first and second rods 48, 50.

Referring to Figures 1, 2 , and 3 , the cutting means 12 and power means 13 are coupled to the rear cross plate 68, while the front cross bar 70 preferably extends under the cutting means 12 and power means 13. The power means 13 preferably includes a motor 74 which rotates a driver 76, a belt 78 rotated by the driver and which, in turn, rotates a drive shaft 80. The cutting means 12 is coupled to the drive shaft 80 such that when the drive shaft is rotated, the cutting means is rotated about its rotational axis. The motor 74, the driver 76, the belt 78, the drive shaft 80, and the cutting means 12 are preferably provided in or coupled to a protective housing 82. The housing 82 includes a window 84 through which the cutting means 12 , which will be described further below, preferably extends . The housing 82 is pivotally coupled to the rear cross plate 68 by a lug (not shown) which extends from the housing 82 through a hole (not shown) in the cross plate 68. A locking knob 85 threadably engages the lug and can lock the housing in a particular pivotal orientation, preferably permitting the housing, and therefore the cutting means, to pivot (tilt) about a pivot axis (which divides the cutting means into two semicircular portions) , preferably at any angle plus or minus 60° from the vertical. As seen in Figure 4, the cutting means 12 and the housing 82 are shown pivoted approximately 30° about the pivot axis.

Turning now to Figures 5 and 6, and according to a first embodiment of the invention, the cutting means 12 is preferably an eight to ten inch diameter saw blade having a central hole 148 through which the drive shaft 80 extends. The saw blade 12 has the ability to cut laterally from either side of the blade as it is provided with a plurality of preferably triple chip teeth 150, each of the teeth preferably being wider than the width of the blade body, and preferably all oriented at a positive hook angle, e.g., 12°. The teeth are triple chip to approximate a radius better than the edge of the rectangular or trapezoidal teeth typically found on blades intended to cut ahead of the blade, and also better than the edge of the blade itself. As such, more than three facets or an actual radius (Fig. 19) may also be provided to the teeth; however, the manufacturing costs of such teeth are higher. Where facets, rather than a true radius, are provided, each facet preferably meets an adjacent facet at an angle greater than 90°. The approximation of the radius is permissible because the saw blade cuts mostly from the side, and desirable because the edge of the blade is thereby better adapted to more closely follow the path of the stylus, as described in more detail below. The teeth 150 preferably have a constant width along their length inward of the facets; i.e., the edge of the teeth. In addition, preferably four elongate strobe teeth 152 are also equally spaced around the saw blade and overlap the cut of the triple chip teeth 150 to allow uninterrupted cutting of the molding. The strobe teeth 152 are preferably radially-oriented (i.e., no hook angle) , but may alternatively be provided with negative or positive hook angles. The strobe teeth 152 extend on both sides of the saw blade and their relatively longer teeth permit an increased cutting depth into the molding. Alternatively, referring to Figs. 18 and 19, a saw blade 12a for the apparatus does not require any strobe teeth. However, without strobe teeth, it is preferred that a plurality of the triple chip teeth 154a be extended in length, e.g., twice as long, to provide the same function as the strobe teeth of Fig. 5. Preferably, the gullet 156a in which the extended teeth 154a are provided is also extended, e.g., twice as long, as the gullet of the teeth 150a.

Referring back to Figures 1 and 2 , the guiding means 14 includes the stylus 15 which has a leading edge 86 that contacts a template, described below, and a shaft 88. The shaft 88 is coupled to a mount 90 which includes a block 92 having a bore 94 sized to receive the shaft 88, and a bracket 96 which is coupled directly to the second elongate bearing collar 62. The block 92 is further provided with preferably three threaded adjustment shafts 98, 100, 102, each rotated by a knob 104, 106, 108 to cause the respective shaft to enter or retract from the bore 94 and contact the shaft 88. Loosening of the individual adjustment shafts 98, 100, 102 permits fine adjustment of the shaft 88 left or right, front or back, or pivotally, and tightening of the adjustment shafts then locks the shaft 88 of the stylus 15 in position. As such, referring to Figure 5, the leading edge 86 of the stylus 15 can be forwardly aligned with the cutting edge of the cutting means 12. In addition, referring to Figure 4, the stylus 15 can be pivoted to the same degree as the cutting means 12. Moreover, referring to Figure 5, it is clearly shown that the pivot axis of the stylus 15 is in the same horizontal plane as the pivot axis of the cutting means 12. More particularly, referring to Figures 5, 6 and 7, the leading edge 86 of the stylus 15 has the same radius of curvature as the cutting means 12, with the same thickness as the cutting means, and with the same profile as the cutting means, i.e., if the cutting means is a saw blade having triple chip teeth, the leading edge 86 of the stylus 15 has a triple chip profile. Referring again to Figures 1, and 2, the template clamp 16 and the molding clamp 18 are provided on a narrow table 110 formed by two laterally extending rails 112 , 114 coupled by preferably three bars 116, 118, 120 extending between the rails. Each of the bars 116, 118, 120, is provided with a lateral throughbore 122, 124, 126. A first threaded rod 128 extends from one end of the table 110 to generally the midpoint of the table, passing through the lateral throughbore 122 in bar 116 and extending into lateral throughbore 124 in bar 118. A second threaded rod 130 extends from the other end of the table 110 to generally the midpoint of the table, passing through the lateral throughbore 126 in bar 120 and extending into lateral throughbore 124 in bar 118. Each threaded rod 128, 130 is provided with a manual rotation knob 131 for rotating the respective rod. Turning now to Figures 1 and 8, the template clamp 16 includes a fixed first clamping portion 132 fixedly coupled, preferably by welding, across rails 112 and 114 of the table 110, and a movable second clamping portion 134 provided with a lower portion 136 having a threaded lateral throughbore 138. The second threaded rod 130 is thread through the lateral throughbore 136 of the second portion 134 such that rotation of the second threaded rod causes lateral movement of the second clamping portion 134. The first and second clamping portions 132, 134 include template gripping portions 132a, 134a which are inwardly angled toward each other. Referring to Figures 8 and 9, it will be appreciated that when a template 135 is placed in the template clamp 16 and the template clamp is tightened by rotation of the second threaded rod 130, the template gripping portions 132a, 134a move toward each other and place inward pressure against the molding 135. Moreover, the angle of the template gripping portions 132a, 134a causes the template gripping portions to hold the template securely against the table 110. Referring back to Figure 8, the molding clamp 18, which is substantially similar to the template clamp 16, includes a fixed first clamping portion 140 fixedly coupled across rails 112 and 114, and a second clamping portion 142 provided with a lower portion 144 having a threaded lateral throughbore 146. The first threaded rod 128 is thread through the lateral throughbore 146 of the second clamping portion 142 such that rotation of the first threaded rod causes lateral movement of the second clamping portion 142. As with the template clamp 16, the first and second clamping portions 140, 142 of the molding clamp 18 include inwardly angled molding gripping portions 140a, 142a. The lateral distance between the fixed template gripping portion 132a and the fixed molding gripping portion 140a is substantially the same as the lateral distance between the cutting means 12 and the stylus 15. The table 110 is coupled to the front end of the stationary member 22 by brackets 160, 162 such that the plane of the table surface (i.e., the surface on which the template and molding to be coped are positioned and held when using the coping device of the invention, as described below) , lies above the plane extending through the pivot axes of both the cutting means 12 and the stylus 15 (Figure 5) .

As will now be described with reference to Figures 10 through 12, the device of the invention can be used to cope baseboard, chair rail, and crown molding. Referring to Figure 10, with respect baseboard and chair rail molding, first, an end 202 of a piece of molding 200 is cut with a conventional powered or hand saw at an angle, e.g., 45° off a perpendicular from a face 201 of the molding. This exposes the profile of the molding; i.e., the cut end 202 (shown in hatching) has an edge 204 which outlines the profile of the molding. Next, referring to Figure 11, the molding clamp 16 is opened by rotating knob 131, and the molding 200 is situated on the table 110 between the first and second clamping portions 140, 142 such that the cut end 202 is oriented toward the cutting means 12. The clamp 16 is then closed about the molding. It will be appreciated that the angled molding gripping portions 140a, 142a of the molding clamp 16 apply inward and downward pressure on the molding to hold the molding secure without marring the face of the molding and allow good reference off table 110. Then, as shown in Figure 11 (with the housing around the cutting means shown in broken lines to better view the cutting means) , the cutting means 12 is powered to rotate about its rotational axis Φ Q)

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are appropriately loosened to permit the stylus 15 to be pivoted to the angle of the angled side (i.e., the same angle at which the cutting means 12 is oriented) , and locked into that pivotal orientation. As the stylus is manually moved to trace the coped profile of template, the powered cutting means will cope the molding 310. It will be further appreciated that because the stylus 15 has been can be pivotally oriented to the same angle as the cutting means, the coping device can accurately cope crown molding.

Turning now to Figures 16 and 17, a second embodiment of a cutting means 12a for use with the coping device of the invention is shown. The cutting means 12a is a disc having abrasive surfaces 402, 404 sufficient to abrade wood. As such the cutting means 12a can be used to laterally ^vcut' wood during the coping process.

There have been described and illustrated embodiments of a coping device. While particular embodiments of the invention have been described, it is not intended that the invention be limited thereto, as it is intended that the invention be as broad in scope as the art will allow and that the specification be read likewise. Thus, while a motor has been described for rotating the cutting means, it will be appreciated that cutting means may be otherwise powered to rotate, e.g., pneumatic or manual rotation means may be employed. Furthermore while particular types of cutting means have been disclosed, it will be understood that other round cutting means, and other sizes of cutting means, e.g., a ten inch diameter saw blade, can also be used for laterally cutting wood can also be used. In addition, while clamps which apply vertical and lateral pressure are preferred for securely holding both the template and the molding to be coped, it will be appreciated that other holding means, particularly for holding the template, may be used. Also, while the device of the invention has been described as being able to cut chair rail, baseboard, and crown moldings, it will be appreciated that the device can be used to cope any copeable molding. Moreover, while it has been described that the device is used for coping moldings made of wood, it will be appreciated that the device can cope copeable molding made from synthetic materials, such as plastics and rigid foams. Furthermore, while various aspects of preferred saw blades have been described with respect to two embodiments thereof, it will be appreciated that the features of the two embodiments may be combined in any manner. It will therefore be appreciated by those skilled in the art that yet other modifications could be made to the provided invention without deviating from its spirit and scope as so claimed.

Claims

What is claimed is :

1. A saw blade, comprising : a blade body provided with a first plurality of teeth, each having at least three facets adjacent an edge of said blade, each of said facets meeting an adjacent facet at an angle greater than 90°.

2. A saw blade according to claim 1, wherein: each of said teeth of said first plurality of teeth has a width greater than a width of said blade body.

3. A saw blade according to claim 2, wherein: said blade body has first and second sides, and each of said first plurality of teeth extends on both of said first and second sides of said blade body.

4. A saw blade according to claim 2, wherein: said width of each tooth of said first plurality of teeth is substantially constant inward of an edge of said tooth.

5. A saw blade according to claim 1, wherein: each of said teeth of said first plurality of teeth is provided with a positive hook angle.

6. A saw blade according to claim 1, wherein: each of said teeth of said first plurality of teeth is a triple chip tooth.

7. A saw blade according to claim 1, wherein: at least one of said first plurality of teeth has a length different than another of said first plurality of teeth.

8. A saw blade according to claim 1, further comprising: a second plurality of teeth, each of which is longer than said first plurality to teeth.

9. A saw blade according to claim 8, wherein: said second plurality of teeth overlap the cut of the first plurality of teeth.

10. A saw blade according to claim 8, wherein: said second plurality of teeth are radially oriented.

11. A saw blade, comprising: a blade body having a first width and including a first plurality of teeth each having a width greater than said first width and an edge portion which approximates a radius better than an edge of said blade body.

12. A saw blade according to claim 11, wherein: each of said first plurality of teeth has at least three facets at an edge of said blade, each of said facets meeting an adjacent facet at an angle greater than 90°.

13. A saw blade according to claim 11, wherein: each tooth of said first plurality of teeth has width which is substantially constant inward of said edge portion of said tooth.

14. A saw blade according to claim 13, wherein: said blade body has first and second sides, and each of said first plurality of teeth extends on both of said first and second sides of said blade body.

15. A saw blade according to claim 11, wherein: each of said teeth of said first plurality of teeth is provided with a positive hook angle.

16. A saw blade according to claim 11, wherein: each of said teeth of said first plurality of teeth is a triple chip tooth.

17. A saw blade according to claim 11, wherein: at least one of said first plurality of teeth has a length different than another of said first plurality of teeth.

18. A saw blade according to claim 11, further comprising: a second plurality of teeth, each of which is longer than said first plurality to teeth.

19. A saw blade according to claim 18, wherein: said second plurality of teeth overlap the cut of the first plurality of teeth.

20. A saw blade according to claim 18, wherein: said second plurality of teeth are radially oriented.