Surface Grinder Planer Blade Sharpening

jmhoying · Aug 3, 2016

I built this jig for sharpening my 13" bandsaw blades. Welded it up and flattened it on the mill. First set I sharpened turned out great. Just had to hone off a bit of a burr and they were ready to go. I have it set up to sharpen my 6" jointer knives also. Grinding the knives at an angle worked good to control heat.

Welding up the jib

CalG · Aug 3, 2016

Knives are best ground under flood coolant. I've burned a couple using the SG. A cup wheel is a good choice.

Tyrone Shoelaces · Aug 4, 2016

I made one at the last place I worked at. It was a piece of 2.5" square cast iron bar about 20" long. I milled a 3/8" wide slot in it at the correct angle about 1.5" deep. After that I just drilled a series of 1/4" tapped holes at 90 degrees to the slot for grub screws that trapped the blade. Easy if you have access to a milling machine.

The surface grinder I used had flood coolant.

Regards Tyrone.

inwoodcutter · Aug 4, 2016

Thanks for sharing. At some point I'll have to make a setup to grind my 16" jointer knives. I've done up to 12" knives in a "dummy" head held between centers on my Wadkin cutter grinder.

michiganbuck · Aug 4, 2016

Looks good...I have done the same and with putting a slight roundness to the wheel to give a hollow grind on the blade..That makes touch-up with a hone easy. Yse with the hollow you dont cross.

Big B · Aug 4, 2016

I planned on making a jig for grinding my planer knives but decided to check and see how much a sharpening service would charge to do the job instead. It cost me 45 cents an inch x 12.5" x 2 blades. They got the job.

The sharpening shop owner also told me that you want the grind to be going perpendicular to the length of the knife. They use a cup wheel on a special grinder.

Tyrone Shoelaces · Aug 5, 2016

michiganbuck said:
Looks good...I have done the same and with putting a slight roundness to the wheel to give a hollow grind on the blade..That makes touch-up with a hone easy. Yse with the hollow you dont cross.

Good tip regarding the hollow grind. I just used a large conventional surface grinder with the usual wheel. I had no complaints from the pattern shop guys.

Regards Tyrone.

michiganbuck · Aug 5, 2016

QT: [It cost me 45 cents an inch x 12.5" x 2 blades. They got the job.]
I was charging .30 an inch a few year back and with a small order with delivering was loosing money for gas.
Grinding on a B&S 13 grinder altered to go 31 inches. Still have the machine but not use it often.
Using a cup wheel at slight angle for the hollow.

One blade, 3o x 6 x 3/4 inch, razor shap was a bugger to hand hold, or load on and off the machine with nor cutting a finger.

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Surface Grinder Planer Blade Sharpening

jmhoying

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CalG

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Tyrone Shoelaces

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inwoodcutter

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michiganbuck

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Big B

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Tyrone Shoelaces

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michiganbuck

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