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#7786 - 03/25/12 07:18 AM A quick jig for sharpening chipper blades.
Lu47Dan Offline
MBN Old hand
Registered: 02/14/10
Posts: 1108
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 45°angle 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!
Used diesel engines are an adventure anyway you look at them!
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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 Offline
MBN Old hand
Registered: 02/14/10
Posts: 1108
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!
Used diesel engines are an adventure anyway you look at them!
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