Drill depth vs. cut tap depth in blind hole

Proctologically ViolatedÂ©Â® · 2008-12-22T14:31:23+00:00

Awl -- Given a desired tap depth, is there a formula for the drill depth?Along those lines, here is a ditty I use for tapping.R8, R9 establish the relationship between drill and tap depths in subroutine L200, and get passed to the Z's in the drill/tap cycle, preserving the relationship. This also minimizes the error of changing one, and not changing the other.I have chosen a drill depth 50% greater than the tap depth.Normally, I would assign these numbers to V variables, and later pass those on to R variables, but with no real calculations, this isn't really necessary here.Feel free to critique the tapping code, as I have no idea why shit is the way it is, just that it works.N13L200N14#R8=.48' tap depthN15#R9=1.5*R8' drill depthN16M17N21M30N22( MAIN PROGRAMN31M6T21( #21 DRILLN32L201N33G0X0Y0Z3.H21E2M3S1500N34Z1.M8N35Z0.1N36G83G98R+0.1Z-R9F7.5Q0.45(

Dec 22, 2008 22 Replies

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BottleBob 17 years ago

Steve:

I think your spell checker turned fluted into flights. But no matter. A wood screw's flutes probably would tend to lift chips and debris - as long as it was turning clockwise viewed from the top.

A post hole auger is kinda like a large wood screw, watch the following video - the tractor not the guy in front. Now imagine if the auger was turning the opposite direction - do you think it would it work as well?

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brewertr 17 years ago

And on an auger it's flight/s not flutes.

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Tom

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BottleBob 17 years ago

Tom:

Now that's cool, I didn't know that.

But it seems the spaces between the flights are still called flutes. So an auger has flutes & flights.

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