How should I grind Everede tool C6 inserts for threading on a 10 degree boring bar?

Sahardcore · Mar 15, 2020

I got hired to run a toolroom at a very old company that has a bunch of these Everede 10-degree lead angle boring bars with triangular prism C6 carbide inserts. What is the best way to grind a 60-degree angle and the relief angles so that the tip will be square with the work?

Everede Tool 10deg Lead Angle Boring Bars - Penn Tool Co., Inc

Everede Tool C2 & C6 Carbide Regrindable Blanks - Penn Tool Co., Inc

Limy Sami · Mar 15, 2020

Exactly as you would for a tool at 90 deg to the work, but offsetting the angles by the amount of lead, all other clearances etc etc stay the same

4GSR · Mar 16, 2020

The last one's I ground for threading, I used the boring bar to hold the insert and set the angles at 60 degrees to the axis of the boring bar. In my case, set at about 75-1/2 degrees to the axis of the boring bar for grinding an Acme threading tool. Got to be careful not to hit the boring bar with your grinding wheel!
Once that part is done, Fixture up to kiss the top of the threading insert to give you a flat neutral angle surface, this will take you a little bit to figure out and do. My setup was done on a K. O. Lee T & C grinder using the universal head. The boring bar was held in a 5C collet in the UH.

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How should I grind Everede tool C6 inserts for threading on a 10 degree boring bar?

Sahardcore

Plastic

Limy Sami

Diamond

4GSR

Diamond

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