TR razr sharpening system

Abstract

A device is disclosed for grinding reel type mower bedknives and blades of rotary type and reel type mowers. The device is capable of manually relief grinding reel blades on an intact mower, and in various stages of disassembly, to a bare reel stripped of its housing, with virtually any relief angle. The device can manually and semiautomatically spin grind a reel type mower reel while the reel is attached to the complete mower or if the reel and supporting structure are removed to a bench, with no further disassembly required. The device can manually grind the front face of a reel type mower bedknife while the bedknife remains attached to the reel housing and can grind the front and top face of a bedknife when it is removed. It can also grind rotary type blades and a variety of other straight edged tools.

Description

TECHNICAL FIELD

The Present invention relates generally to machine tools, more specifically to methods and apparatus for sharpening reel blades, bedknife blades, and rotary blades on lawn and turf mowers.

BACKGROUND OF THE INVENTION

Commercial mowers typically utilize both reel type and rotary type mowing units which must be maintained regularly to assure proper operation. Part of such maintenance involves sharpening the reels, bedknives, and rotary blades. This is a time consuming process. Prior art requires at least three separate machines to perform the needed operations. These machines are heavy, expensive, and bulky, requiring a sizable amount of shop space. One machine typically will spin grind and relief grind reels once the reel and supporting structure is removed from the mower and disassembled to some degree. One machine will grind the front and top face of a bedknife once the bedknife and supporting bedbar is removed from the reel housing. And still another machine will grind rotary blades.

There is a need in the art for a grinding machine that maintains or surpasses the quality and accuracy attained by current heavy, expensive stand alone machines that is capable of performing all the grinding needs of commercial lawn and turfgrass professionals housed in a single machine, that is lightweight and portable enough to attach directly to a reel type mower without removing the cutting unit from the complete mower if desired, providing a degree of flexibility far superior to any grinding machine prior to the present invention.

BRIEF SUMMARY OF THE INVENTION

The present invention, in one embodiment, is a device for manually relief grinding a reel blade having a radially outer edge of an elongated length and first and second faces, with the first and second faces extending generally radially from the reel axis and the second face being the one that is relief ground. The device has the flexibility to perform the operation on an intact mower, on a cutting unit that has been removed from the mower in its' intact or partially disassembled state, or directly on a bare reel void of its' housing.

The present invention, in another embodiment, spin grinds the first face, described in the previous embodiment, of all the reel blades making up the reel cylinder simultaneously either manually or semiautomatically with the flexibility to perform the operation directly on an intact mower, or with the intact cutting unit removed from the mower.

In yet another embodiment, this invention manually grinds the front face of a bedknife of a reel type mower without the need to remove the bedknife and supporting bedbar from the cutting unit housing.

In another embodiment, this invention manually grinds the front and top face of a bedknife of a reel type mower when the bedknife and supporting bedbar is removed from the cutting unit housing.

In still another embodiment, this invention manually grinds rotary type mower blades utilizing a center pivot and blade stop allowing precise symmetrical grinding at apposing ends of the blade. This same embodiment is capable of grinding any straight blade (chisel, cutting bar, etc.) found in a maintenance shop.

While multiple embodiments are disclosed, still other embodiments of the present invention will become apparent to those skilled in the art from the following detailed description, which shows and describes illustrative embodiments of the invention. As will be realized, the invention is capable of modifications in various obvious aspects, all without departing from the spirit and scope of the present invention. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not restrictive.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1. is a right front perspective view of the invention set up for semiautomatic spin grinding a reel of a reel type mower when the reel and supporting structures are removed from the mower. The reel and supporting structures have been left out for clarity.

FIG. 2. is a closeup right front perspective view of the carriage unit portion of the invention.

FIG. 3. is a closeup perspective view of the grinder bracket of the invention attached to a commercial grinder in the “reel grinding” configuration.

FIG. 4. is a perspective view of the carriage unit right side-rail bracket showing the attached drill bracket used to support a commercial drill used to spin the reel during the spin grind operation. The right carriage unit side-rail and rods are shown in phantom.

FIG. 5. is a perspective view of the carriage unit right side-rail bracket with attached drill bracket and drill (shown in phantom).

FIG. 6. is a perspective view of the carriage unit, the carriage unit frame, and the carriage unit side rail brackets used to attach the invention to the underside of the reel housing (shown in phantom) of a reel type mower.

FIG. 7. is a perspective view of the carriage unit with attached grinder bracket, the carriage unit frame, and the carriage unit side-rail brackets configured with an additional set of brackets (in phantom) used to support a barren reel for relief grinding. The base stand used to support the carriage unit frame is not shown.

FIG. 8. is a perspective view of a portion of the invention showing the orientation of the relief grind bracket used to trap a reel blade during relief grinding.

FIG. 9. is a front right perspective view of the base stand used to support the carriage unit frame (shown in phantom), or the reel housing whenever the invention is not used directly on the intact mower.

FIG. 10. is a perspective view of FIG. 9 with the additional attachment of the bedknife/rotary blade bar (shown in phantom).

FIG. 11. is a perspective view of FIG. 10 with the additional attachment of the bedbar brackets (shown in phantom).

FIG. 12. is a perspective view of FIG. 11 showing the attachment of a bedknife (in phantom) and the right bedknife bracket and finger (shown in phantom).

FIG. 13. is a perspective view of FIG. 12 showing the attachment of the commercial grinder (shown in phantom) orientated to allow bedknife front face grinding.

FIG. 14. is a perspective view of FIG. 10 showing the attachment and orientation of a rotary mower blade and grinder in phantom.

FIG. 15. is a partial perspective view of the left side of the carriage unit showing caliper bracket attachment and orientation to allow micro-adjustment of the invention to a reel of a reel type mower.

FIG. 16. is a closeup perspective view of the right side of the grinder bracket and right bedknife bracket and finger attached to the carriage unit showing the relationship between the bedknife finger and a reel blade when grinding the front face of a bedknife within its' reel housing.

FIG. 17. is a closeup perspective view of the left side of the carriage unit showing the relationship between the left bedknife bracket finger and a reel blade when grinding the front face of a bedknife when it remains attached to the reel housing and also showing the left bedknife bracket finger location (in phantom) when relief grinding a reel blade.

FIG. 18. is a perspective view of the grinder bracket of FIG. 3 attached to a commercial grinder in the “rotary blade” position.

FIG. 19. is a front left closeup perspective view of the bedbar and carriage unit showing the configuration and orientation of the caliper bracket and bedknife during the micro-adjusting phase of grinding the top face of a bedknife.

FIG. 20. is a front left closeup perspective view of the bedbar and carriage unit showing the configuration and orientation of the caliper bracket and bedknife during the micro-adjusting phase of grinding the front face of a bedknife when it is removed from the reel housing.

FIG. 21. is a front perspective view of a reel within its support housing sitting on the base stand with the carriage unit attached in a three point configuration.

FIG. 22. is a closeup front partial perspective view of the components making up the rear attachment of the carriage unit stabilizer bar to the base stand when using a three point attachment configuration.

FIG. 23. is a perspective view of the reel clamp used when attaching the carriage unit to a fully assembled reel-type mower in a three point attachment configuration. A reel roller is shown in phantom.

FIG. 24. is a perspective view of the reel clamp of FIG. 23 from a different angle.

DETAILED DESCRIPTION

Referring to the drawings, wherein like reference numerals designate like or corresponding elements throughout the views, the assembly and modes of action will be thoroughly explained.

Spin Grinding on the Intact Mower

With regard to spin grinding a reel of a reel type mower particular attention is directed toward FIGS. 1-7, 9, 15, 21-24. When performing this operation on the intact mower, the reel stand consisting of members 1-9 of FIG. 9 is not required. By utilizing a vehicle hoist the complete mower is raised to a comfortable working height. The reel is stabilized and the carriage unit frame, shown in FIG. 6 consisting of two parallel rods 9, a left 11 and right 10 side-rail, and a main carriage unit 12, affixed with a set of carriage unit side-rail brackets 17+18, is releasably attached directly to the reel housing 16 by the front 19 and rear 20 attachment bracket of the left 18 and right 17 side-rail brackets. By using a variety of bracket extensions (not shown) connected to the front 19 and/or rear 20 attachment bracket, and pre-adjusting the width of the carriage unit frame using the rod 9 set screws 73 (FIG. 1) and rod 9 snap rings 54, a configuration for releasable four point attachment to any style reel housing 16 (FIG. 6) can be accomplished. By utilizing a stabilizer bar 103 (FIG. 21), with an adjustable center post 104 (FIG. 22), attached to the carriage unit side-rail brackets' universal rear stump 20 (FIG. 21) with a pair of stabilizer bar brackets 105 and a mower unit rear roller clamping device consisting of a two part 106,107 (FIGS. 23,24) expandable roller clamp and a slidable stabilizer bar post clamp 108, a means for releasable three point attachment to a reel housing can be accomplished.

Once the carriage unit frame with affixed side-rail brackets 17,18 (FIG. 6) is securely attached to to the reel housing 16, the caliper bracket 83 (FIG. 15) is releasably attached to the left side of the carriage unit 12 with a knob 85. The carriage unit right side-rail bracket 17 (FIG. 4) is adjusted in the horizontal and vertical plane to bring the carriage unit frame into a position parallel to the longitudinal axis of the reel in two perpendicular planes. The horizontal adjustment is accomplished by loosening the two horizontal lock knobs 51 and turning the horizontal micro-adjust knob 23 clockwise or counterclockwise until horizontal caliper 86 (FIG. 15) readings to the center post of the reel 82 at each end become equal. Likewise the vertical adjustment is accomplished by loosening the vertical lock knob 44 (FIG. 4) and turning the vertical micro-adjust knob 43 clockwise or counterclockwise until the vertical caliper 84 (FIG. 15) readings to the center post of the reel 82 at each end become equal.

The previous attachment and adjustment procedure is essentially the same whenever a reel of a reel type mower is either spun or relief ground or the bedknife ground within its' housing.

Next the grinder bracket 37 (FIG. 3) is releasably attached to a commercially available 4½″ angle grinder 25 in the “reel grinding” position and tightened so the grinder pointer 33, attached to the grinder housing with fastener 77, is aligned with a specific side-scale mark 75 on the grinder bracket 37 that will allow the grinder wheel 76 to make contact with the reel blades when the grinder bracket 37 is releasably attached to the carriage unit bracket 29 (FIG. 2), using post 36 (FIG. 3), and tightened when the carriage unit bracket pointer 34 (FIG. 2) is aligned with a specific grinder bracket 37 (FIG. 3) top scale mark 74.

As shown in FIG. 2., the grinder supporting (grinder and grinder bracket not shown) carriage unit is made up of a main unit 12 that traverses on two parallel rods 9 via linear bearings 28. The carriage unit bracket 29, that supports the grinder bracket, slides on a track inward, towards the surface to be ground, and outward, away from the surface to be ground, using a lead screw 30 controlled by an adjusting wheel 31 and locked in position using two knobs 26.

The carriage unit 12 holds the drive cup 32 that captures the bearing mounted post 71 (FIG. 1) attached to a looped chain 70 driven by a small electric motor used for traversing the carriage unit 12 to and fro automatically when the autodrive assembly 64 is employed.

If an independent reel backlapping feature is supplied with the particular mower being sharpened, the reel can be turned in the backwards rotation utilizing the mowers' own power and a separate power supply to spin the reel is not needed. If a mower backlapping feature does not exist, or the reel and supporting structures are removed from the mower for sharpening, an external power supply for spinning the reel is achieved using a commercially available reversible drill 48 (FIG. 5). The drill is fixtured with a ⅜″ drive socket 78+/−a coupler to allow the drill to be seated into the splined reel end to facilitate spinning the reel. The adjustable drill bracket 46,47 is releasably attached to the carriage unit side-rail bracket 17 or 18 via the side-rail bracket drill clamp 45 and a knob 50. The drill is adjustably positioned centered and parallel to the reel centerpost and clamped in place with knob 49.

Next the auto drive assembly as shown in FIG. 1, used to automatically traverse the carriage unit to and fro during spin grinding, is releasably attached to the carriage unit side-rails 10,11. The autodrive assembly consists of a main portion 64 that supports a small electric motor housed in a protective box 66 that drives a continuously looped chain 70, between two sprockets 69, onto which a bearing mounted post is fixed 71 that mates with the drive cup 32 of the carriage unit 12 when the assembly is attached. Chain movement is started and stopped using a control switch 79. The width of the autodrive assembly is adjustable to fit various reel sizes by use of a sliding accessory portion 65 and tightening knob 67. The autodrive assembly is releasably attached to the carriage unit side-rails 10,11 via locating posts 21 and clamping knobs 68.

Spin. Grinding a Reel Removed from its Housing

Spin grinding a reel within its' support housing that has been removed from the mower unit is essentially the same as when the cutting unit remains attached to the mower with the addition of a reel stand employed to hold the reel housing in a position that allows carriage unit frame attachment. Referring to FIGS. 6,9 the reel stand is assembled with the two base parts 1,2 connected via an extension 3 and stabilized with a rear strap 6, supporting the rear clamping brackets 7,8, forming a tripod. The extension 3 is adjusted and tightened in place when the distance between the reel roller supports 4 is equal to the distance between the rear roller support points 72 (FIG. 6) of the reel rear roller. The two stand straps 5 (FIG. 9) are removed and not used. The reel and housing 16 (FIG. 6) is lifted onto the stand aligning the rear roller positions 72 onto the roller supports 4 (FIG. 9). The reel housing is positioned vertically, so the underside of the reel housing is accessible, and clamped in this position using the rear stand clamps 7,8 releasably attached to the reel housing.

If a three point carriage unit attachment configuration is employed when using the base stand, the reel clamp components 106,107,108 (FIG. 23) are replaced with the base stand three point bracket components 100,101,102 (FIG. 22).

Relief Grinding

Manually relief grinding the blades of a reel type mower involves initial setup and attachment of the carriage unit frame to the reel housing as described previously. It can be performed on the complete mower, when the cutting unit is, removed from the mower, or on a barren reel void of its' bearings. This procedure is most often performed after the reel has been spin ground returning it to a cylinder.

The autodrive assembly 64 (FIG. 1), drill 48 (FIG. 5), and drill bracket 46,47 are removed after spin grinding.

The grinder bracket 37 (FIG. 3) to grinder tightening nuts 80 and the carriage unit bracket 29 (FIG. 2) to grinder bracket 37 (FIG. 3) nut 36 is loosened and the grinder brackets' 37 top-scale 74 and side-scale 75 are aligned with their respective pointer 34 (FIG. 2), 33 (FIG. 3) positions to allow the grinder wheel 76 to make contact with the second face of a reel blade producing the desired relief angle when grinding. The relief grind bracket 53 (FIG. 8) is releasably attached to the carriage unit clamp 27 and locked in a position with the knob 59 that allows this bracket to support a reel blade 52 from beneath effectively trapping the reel blade 52 between the bracket 53 and the grinding wheel when the carriage unit traverses from one end of the reel blade to the other producing even contact of the grinder wheel on the reel blade second face its' entire length. Additional travel of the carriage unit 12 to the right side of the reel blade allows the relief grind bracket 53 to clear the reel blade 52 allowing the next blade on the reel to be manually aligned with the relief grind bracket 53 and effectively trapped between the bracket 53 and the grinder wheel as the carriage unit 12 is manually traversed to the left the length of the reel blade 52 and then traversed back to the right. This procedure is repeated until all reel blades have been relief ground. The carriage unit depth of grind adjustment wheel 31 (FIG. 1) is turned ⅛ turn counterclockwise prior to starting a new cycle thru the individual reel blades 52 (FIG. 8). These steps are repeated until only 1/32″ of spin grind remains on the reel blades' first face.

To help manually align individual reel blades with the relief grind bracket during relief grinding the left bedknife bracket 87 (FIG. 17) and finger 91 is releasably attached to the left side of the carriage unit 12 and adjusted into a position 89 to give a reference point as to where the next reel blade is aligned to allow it to be trapped by the relief grind bracket during the grinding operation.

Performing the relief grind procedure on a barren reel requires the use of an additional set of brackets 38 (FIG. 7) attached to the carriage unit side-rail brackets 17,18 fixtured with a set of end bearings 39, one of which is adjustable via a lead screw 94 allowing direct reel attachment to the carriage unit.

Grinding the Front Face of a Bedknife within its' Housing

This procedure can be accomplished on the complete mower or when the cutting head has been removed from the mower. Initial attachment and adjustment of the carriage unit frame to the reel housing is the same as described earlier when spin grinding a reel on the intact mower. The only difference being changing the set angle of the grinder in both planes and attaching two brackets used to rotate the reel blades away from the grinder wheel as the length of the bedknife is ground.

Referring primarily to FIGS. 2,3,16,17 the grinder bracket 37 (FIG. 3) to grinder tightening nuts 80 and the carriage unit bracket 29 (FIG. 2) to grinder bracket nut 36 (FIG. 3) is loosened and the grinder brackets' top scale 74 and side scale 75 are aligned with their respective pointer 34,33 positions to allow the grinder wheel 76 (FIG. 16) to make contact with the front face of the bedknife at the desired front face angle when grinding commences.

In order for the carriage unit to traverse the length of the bedknife, while grinding its' front face, without the grinder wheel making contact with the reel blades a means is described for rotating the said reel blades out of the way, providing grinder wheel clearance, as the grinding wheel traverses the length of the bedknife. This is accomplished by using a set of brackets releasably attached to either side of the carriage unit. The right bedknife bracket 60 and accompanying finger 58 is attached to the carriage unit clamp 27 (FIG. 2) with a knob 59. The finger 58 (FIG. 16), by way of a slot and tightening nut 61, is aligned so its' leading edge makes contact with the underside of a reel blade 52 and thus rotates the said reel blade out of the way of the grinding wheel 76 as it traverses to the left along the front face 95 of the bedknife 57.

The left bedknife bracket 87 (FIG. 17) and accompanying finger 91 are attached to the carriage unit 12 with a knob 85. The finger 91, by way of a slot and tightening nut 90, is aligned so its' leading edge 88 makes contact with the top side of a reel blade 52 and thus rotates the said reel blade out of the way of the grinding wheel as the carriage unit 12 traverses to the right along the front face 95 of the bedknife 57.

Grinding the Front Face of a Bedknife (when Removed)

Referring primarily to FIGS. 9-13,18,20 the two main portions of the base stand 1,2 are assembled with straps 5 attached and joined together with an adjustable extension 3 that allows the carriage unit frame, consisting of the carriage unit left 11 and right 10 side-rails, carriage unit rods 9, and main carriage unit 12, to be releasably attached and secured to the stand straps 5 using the lower straps' slot 96 and a knob 51.

The bedknife/rotary blade bedbar, consisting of a bedbar 13 (FIG. 10) fixtured between, a left 15 and right 14 bedbar side-rail, is releasably attached to the carriage unit side-rails 10, 11 using the middle 97 and upper 98 protruding bolts and knobs. To this bedbar 13 (FIG. 11) is releasably attached the left 56 and right 55 bedbar brackets. These bedbar brackets house several variably sized holes used to secure the bedknife support frame 93 parallel in the vertical plane to the carriage unit frame. These bedbar brackets 55,56 are slotted to allow adjustment of the bedknife support frame 93 parallel to the carriage unit frame in the horizontal plane.

The grinder bracket 37 (FIG. 18) is releasably attached to a commercially available grinder 25 in the “rotary blade” position and secured with tightening nuts 80. The grinder bracket 37 is in turn releasably attached to the carriage unit bracket 29 (FIG. 2) using the rotary blade post 35 (FIG. 18). This configuration allows the grinder wheel 76 edge to be used during grinding procedures when the bedbar 13 (FIG. 12) is employed (the grinder wheel face is used for grinding procedures when the bedbar 13 is not employed).

Initially the bedbar left 15 and right 14 side-rails' witness marks are set to a carriage unit side-rail scale 42 mark. This scale setting in combination with a bedbar bracket 55,56 scale setting 99, and rotation of the bedknife support frame 93, while advancing the grinder wheel toward or away from the bedknife face with the carriage unit depth of grind adjustment wheel 31, will allow the operator to fix the position of the bedknife 57 front face such that the desired front face grind angle can be achieved when the grinder wheel contacts the bedknife during grinding.

To assure complete alignment accuracy, the caliper bracket 83 (FIG. 20) is configured in such a way that, when releasably attached to the left side of the carriage unit 12, a measurement can be taken vertically with the caliper 86 to the top milled portion of the bedknife 57 on either end, and the right bedbar side-rail 14 (FIG. 12) micro-adjusted using the knob 23 until the bedknife becomes parallel to the carriage unit frame to within 0.001″.

If more than one of the same style bedknife is to be sharpened, the right bedknife bracket 60 (FIG. 13) and finger 58 can be configured and releasably attached to the carriage unit clamp 27 so the fingers' leading edge contacts the flat underside portion of the bedknife 57. Set in this manner the bracket becomes a guide to quickly and accurately attach and align a new bedknife for grinding and produce the same grind angle as the first.

Grinding the Top Face of a Bedknife

Grinding the top face 92 (FIG. 19) of a bedknife is carried out after the front face has been ground. If attached, the right bedknife bracket 60 (FIG. 13) is removed. The bedbar brackets 55,56 are loosened and moved to a pre-determined bedbar scale setting 99. By loosening the bolts connecting the bedknife housing 93 to the bedbar brackets 55,56 and rotating the bedknife 57, while simultaneously advancing the grinder wheel 76, via the adjusting wheel 31, inwards or outwards, the operator can achieve the desired top face 92 (FIG. 19) grind angle.

Once the bedknife position is fixed the caliper bracket 83 can be configured and releasably attached to the carriage unit 12 with a tightening knob 85 to allow the calipers' 86 post to make contact with the factory machined area posterior to the bedknife top face 92. The use of this caliper 86, in conjunction with the micro-adjust knob 23 (FIG. 13) located on the right bedbar side-rail 14, allows the operator to align the length of the bedknife within 0.001″ parallel to the carriage unit frame prior to grinding.

Grinding Rotary Blades

Grinding rotary mower type blades 24 (FIG. 14) requires the same setup procedures explained previously in grinding a bedknife removed from the reel housing except the bedbar brackets 55,56 (FIG. 12) are removed and a threaded post 63 (FIG. 14) with a tightening knob, affixed to a rail, is positioned in the track at the midportion of the top face of the bedbar 13. A rotary blade 24 is placed onto the centerpost 63 and positioned such that, as the grinder wheel 76 is advanced toward the rotary blade edge utilizing the carriage unit adjusting wheel 31, contact between the blade 24 edge and the grinder wheel 76 edge produces the desired grinding angle and taper during grinding. The rotary blade 24 is releasably fixed in this position with a tightening knob on the centerpost 63. A slotted blade stop is adjustably attached to the bedbar 13 at position 62 and abutted to the back edge of the rotary blade 24 and fixed in this position with a tightening knob. By loosening the centerpost 63 knob the rotary blade can be turned end for end on its' center axis, butted up to the blade stop, retightened at the centerpost 63, and be in a position that will produce a symmetrical grind to the first end.

Claims

1. A single portable device for grinding a detached rotary type mower blade and the blades and bedknife of a reel type mower, with or without removal from the complete mower and with or without disassembling the reel or bedknife from its' housing, which is capable of both single blade (relief) grinding and spin grinding of said reel and front and top face grinding of said bedknife comprising:

a. a carriage unit frame including two transverse rods and side-rails substantially parallel to one another.

b. a carriage unit supported on said guide rods of said carriage unit frame adapted for translation along said guide rods.

c. a grinder bracket supported on said carriage unit capable of supporting a commercially available angle grinder in a manner that allows grinding operations with the face or edge of the grinding wheel.

d. a means for said grinder bracket of said carriage unit to be slidably adjusted, inward or outward, to control the depth of grind.

e. a means by use of an adjustable set of carriage unit side-rail brackets releasably attached to said carriage unit side-rails that releasably attach the said carriage unit frame to the reel support structures in a position that, when traversing the said carriage unit across the said guide rods, the said carriage unit maintains a distance parallel to the longitudinal axis of the reel in two perpendicular planes.

f. a means by use of accessory brackets attached to said carriage unit side-rail brackets that allow the said carriage unit frame to attach to a variety of reel mower housing styles in either a four point or three point attachment configuration.

g. a means by use of an adjustable reel roller clamp to allow a three point carriage unit attachment configuration.

h. a means by use of brackets attached to said carriage unit side-rail brackets, fixtured with centering bearings that allow the said carriage unit frame to be releasably attached directly to a barren reel in a position that allows relief grinding.

i. a means by use of accessory brackets attached to the said carriage unit side-rail brackets that allow releasable attachment of a drill supporting bracket capable of positioning a commercially available variable speed reversible drill in a manner that it may be used as a source of power to spin a reel of a reel type mower during spin grinding.

j. two releasable clamping means attached to said carriage unit used for attaching accessory brackets.

k. an accessory bracket releasably attached to the first said clamping means of said carriage unit configured to support the back side of a reel blade effectively trapping the blade between said bracket and the grinder wheel during relief grinding.

l. an accessory bracket releasably attached to second said clamping means of said carriage unit configured to be used as a visual aid when aligning individual blades of a reel during relief grinding.

m. an accessory bracket releasably attached to the second said clamping means of said carriage unit supporting a set of calipers configured to a certain that the said carriage unit frame, when in use, is aligned parallel to the reel axis or surface being ground in two perpendicular planes.

n. a set of accessory brackets releasably attached to the first and second said clamping means of said carriage unit configured so that, during the operation of grinding the front face of a bedknife within its' reel housing, the brackets make contact with the reel blades and rotate them away from the grinding wheel as it traverses the length of the bedknife during grinding.

o. a means by use of a base stand to support and position a reel housing for said carriage unit side-rail bracket attachment when the reel and supporting housing are removed from the mower. This said base stand provides an adjustable means to support reels of variable widths and accessory brackets to provide one point of fixation during three point carriage unit attachment. It also provides a means by use of a pair of removable straps that allow releasable attachment of the said carriage unit frame, void of said carriage unit side-rail brackets, directly to the said base stand when employing the bedbar during rotary blade and bedknife grinding.

p. a said bedbar, comprised of two parallel bedbar rails supporting a connecting bar or table, with a means that allows said bedbar rails to be releasably attached to said carriage unit frame releasably attached to said base stand, creating a work surface parallel in two perpendicular planes to the longitudinal travel of the said carriage unit when traversed on the said guide rods.

q. a means by use of a set of bedbar brackets releasably attached to said bedbar that releasably attach to the ends of a bedknife that can be manipulated and fixed in a manner that aligns the said bedknife in multiple positions, parallel in two perpendicular planes to the said carriage unit, to facilitate front and top face bedknife grinding, when said carriage unit is traversed on said guide rods.

r. a means by use of a sliding bedbar bracket that releasably attaches to a channel in the mid-portion of said bedbar supporting a post and clamping means to releasably attach a rotary type blade to said bedbar in a manner that aligns the rotary blades' edge parallel in two perpendicular planes to the said carriage unit when traversed on said guide rods and in a position where the attached grinder wheel of said carriage unit will produce the desired grind angle and taper.

s. a means by use of a blade stop releasably attached to the said bedbar during rotary blade grinding that will allow the said rotary blade to be flipped precisely end for end achieving the same grind angle and taper at each end.

t. a means for automatic translation of said carriage unit on said guide rods in both directions using a small electric motor, sprockets, and a looped chain bearing a post, supported on an adjustable bracket with a means for clamping said bracket to said carriage unit side-rails creating a union between said chain post and a post capturing cup fixed to said carriage unit.