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06-11-2013 #11
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06-11-2013 #12
Thank you Jonathan, that is excellent information, just what I need! Will take me a little time to fully digest but will be worth it.
I didn't consider the flat spot at all. Wouldn't have been a disaster, but wouldn't have been correct either!
I asume if I use an insert v bit (such as CNC V Groove Miter Fold & Signmaking Insert Router Bit by Amana Tool) then I could just use Z=d/(2*tan(a/2)) as there would be no flat spot?
The radiused tip/ballnose cutter was also a great thought. I was only considering supporting v cutters but I think you have changed my mind.
Thanks!
(haven't seen "LetMeGoogleThatForYou" before! Almost spat coffee on my keyboard when I clicked it!)Last edited by cncJim; 06-11-2013 at 12:18 PM.
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06-11-2013 #13
There's always going to be a flat of some sort, but for the tool you linked to I expect it would be neglegible. You might as well use the formula with the flat in your program, and just set f to 0 if the flat is insignificant as that results in the same formula as for without a flat.
If you've got the tool to hand, then one way to measure the flat is to spin it round and move the Z-axis down until it just touches. Retract the Z-axis and measure the diameter of the circle left - that's your f.
It's temping to link people to that quite often
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06-11-2013 #14
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