Thread Cutting on the Lathe, Part Two - Grinding the Tool

Thread Cutting on the Lathe, Part Two - Grinding the Tool - Printable Version

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Thread Cutting on the Lathe, Part Two - Grinding the Tool - TomG - 07-28-2013

This episode applies concepts covered in the first video to grinding a tool.

Tom

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - b4dyc - 07-29-2013

Excellent stuff! Applaud

Thanks for these videos Smile

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - TomG - 07-29-2013

Thanks Andy, hopefully they help out.

Although you are no doubt waiting for the metric version. Drool

Tom

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - f350ca - 07-29-2013

Great video Tom. You've inspired me to pay attention to the clearance angles and flat , rather than my usual that looks good enough. With a calibrated eye ball of course.

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - TomG - 07-29-2013

Thanks Greg.

Clearance angles on a V thread normally are good enough, but the flat requires close attention.

Tom

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - DaveH - 08-02-2013

That was very nicely shown - excellent video Thumbsup

DaveH

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - PixMan - 08-03-2013

Tom,

I SO much prefer your videos over the BoobleCain ones. I find that guy to be so annoying, and often WRONG.

Now a question: A 1/32" flat on the tip of the tool would be for a 4 TPI thread. Is that what you are making for a thread with that tool?

The formula for the flat at the root of an ANSI "UN" thread is .125 x P, or at least that what I've always used.

Here's an online calculator which seems to use a tolerance on that root flat of external threads, showing .1875 x P to (my recommendation of) .125 x P.

http://theoreticalmachinist.com/Threads_UnifiedImperial.aspx

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - TomG - 08-03-2013

Hey Ken,

The flat should have been 1/8 pitch not 1/4 pitch. I thought it looked a bit large when I made the tool. Now how to edit the video...

Thanks for catching the error.

Tom

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - TomG - 08-04-2013

The new video is up and as an added bonus it's now available in HD. The mistake is corrected, now if I could just do something about the narrator.

Tom

RE: Thread Cutting on the Lathe, Part Two - Grinding the Tool - dallen - 08-04-2013

why is it that the inserts that I have, have no flat on the point.

DA