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#7786 - 03/25/12 07:18 AM A quick jig for sharpening chipper blades.
Lu47Dan Online   content
MBN Old hand
Registered: 02/14/10
Posts: 1014
Loc: N/W Pa. ****
Since I have the surface grinder working now, I can sharpen my own blades for my chipper shredder. But to sharpen them I heeded to build a jig to hold the blade at a 45angle while it is being sharpened.

The blade is 4.250" long and approximately 1.250" wide. The three countersunk holes are for 1/4" - 20TPI countersunk socket head capscrews. The capscrews are then secured with a nylock nuts on the inside of the chipper wheel.

The edge was pretty much blasted away from years of use. I am going to make four new blades to have on hand so I can just change the blade when it gets dull. Then I can sharpen three of them at once instead of having to sharpen it every time.

The angle of the blade is 45 an easy angle to duplicate. The blades thickness is a little less then 0.250"

I dug out a piece of angle to use as the jig. I cleaned up the cut ends and then ground the surface I wanted to use to mount the blade on. I then set it up in my mill and located the one corner, and started to drill the matching bolt pattern into the jig. Once I had drilled the holes I tapped then to 1/4 - 20, and the jig was ready for the blade.

I then mounted the blade using three socket head capscrews, and placed the jig on the magnetic chuck. I blocked the jig on both ends with my 1-2-3 blocks, to prevent it from get thrown across the shop by the grinding wheel.
I then rough ground the blade to hog off the worn surface. After dressing the wheel again I sparked off and then took another 0.001 off of the edge in several steps and sparked out.

The finished face of the blade.
I did clean up the back of the blade to help remove the dings in the edge, I took about 0.003" off that surface and it made a great difference in the quality of the edge.
I have to make a decision on what material to make the blades from, I need to study up on them determine what grade of tool steel would be the best for these.
Dan.
_________________________
Tools are to Men as Shoes are to Women, you can never have too many!
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#7788 - 03/25/12 07:45 PM Re: A quick jig for sharpening chipper blades. [Re: Lu47Dan]
bigdodge Offline
MBN member
Registered: 04/04/11
Posts: 200
Loc: Marion IN
All I no is the one time I changed the ones on a chopper at work is. Them thangs are supper sharp. Just make shure to keep an eye on your fingers while handling them
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#7805 - 03/27/12 06:18 PM Re: A quick jig for sharpening chipper blades. [Re: bigdodge]
Lu47Dan Online   content
MBN Old hand
Registered: 02/14/10
Posts: 1014
Loc: N/W Pa. ****
Update.
After installing the blade and assembling the chipper/shredder I had to wait a couple of days to test it as the weather was not the best.
I spent yesterday thinning and trimming my Rose of Sharon hedge/privacy screen to narrow it down so I can mow up closer to it.
The resulting pile was pretty big. grin
I set everything up and the started chipping up the brush pile, it took about 2-1/2 hours to chip it all up. A lot less time then I had figured on. grin
The sharpened blade slowly drew the branch into the chipper, but not with enough force to make it dangerous. I can stop the feed without any problem. I am happy with the chippers performance now.
Dan.
_________________________
Tools are to Men as Shoes are to Women, you can never have too many!
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