counter boring for bearings?

K

Kody23

Joined
May 6, 2012
Messages
56
What's the best way to make sure you get the bearing pocket the same depth on both sides of the blade? The first time I tried it I just guessed how far to go and got it to about 2-3 thousands off on either side, which threw the blade off center. Any suggestions on a better way of doing this?
 
What are you using to do the counter bore? If a mill you can set the quill stop or better setup a dial indicator so that you can measure the downward movement. You could also use a depth gauge and redo the shallow side to match.
 
The drill press should have a stop for the quill but it don't matter that much. run the quill down until it stops or if you have an adjustable stop set it somewhere. set up just like you were going to drill the pockets. adjust the table so that with the quill down against what ever stop you use, the liner material is just barely touching the liner. now put a shim under the liner the same thickness as you want the depth of the bearing pocket clamp everything down and drill the bearing pocket and then without moving anything change bits and drill the pivot hole.
 
So I followed your advice bill and got them dead on perfect even. The sad thing is my blade is still off center. :thumbdn:
 
Glad the pockets turned out, too bad about the blade. My guess is that your pivot hole is not perpendicular to the rotation axis of the blade. make sure your drills quill is as close to a perfect 90 degree angle to you table as possible. be sure to check at least 4 points around the table. you can check it with a piece of bent wire.
 
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