Milling a round recess?

Andrew McLurkin

Andrew McLurkin

Joined
Aug 31, 1999
Messages
716
I hide my pivot screw under my bolsters and have tried various techniques for creating the recessed pocket for my screws. I have used drills and a bottom cutting carbide burr. I like the burr because it leaves a flat bottom, but I'm not getting the results I want. Both ends of my pivot assembly are flat: Flathead gun type screw on one side, flat ground pivot shoulder on the other side. I want to mill the pocket on each side but don't know what type of cutter to use. Any thoughts?
 
Andrew,buy some end mills and use them in your drillpress.I have found this works great.Dave
 
I could use some more help. With end mills would it be better to use center cutting or non-center cutting, 2 or 4 flute, HHS or carbide? Is there any trick to starting an end mill when plunging straight down? I plan to use my TAIG mill.

Thanks
 
Try center cutting HSS 4 flute and just plunge . If the bit skates you might try spotting the hole with a drill bit first.

A drill bit ground square will do the same job but tends to chatter a bit and requires the regular drill bit spotting the hole first.

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george
www.tichbourneknives.com
sales@tichbourneknives.com




[This message has been edited by george tichbourne (edited 12-18-2000).]
 
I would not suggest putting an end mill in a drill press. It is made and designed to be held in a collett in a bridgeport. A three jaw chuck does not hold it tight enough, and the spindle on the drill press was not made for lateral movement. Just use an oversize drill to make the recess. If the pivot is 3/16 use a 3/8 inch drill. You might have to experiment to see whick drill works out the best. You only need to remove a small amount of material, and no one is going to see the recess anyways.

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A Knife is no more than an Iron Tooth
 
use a round rotary burr file and grind the sides smooth to the same diam as the screws and then plunge with the drill press.
 
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