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Re: end mill holder

 

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Hello:


I was told tap drills in metric are simple: screw size minus pitch, so M14 - 1mm = 13mm tap drill. 12.75 might be 100% thread, but not much stronger than 75%.


Carl.


On 9/5/2023 12:05 PM, Andrei wrote:

12.75 is the drill size for an M14 tap
From: [email protected] <[email protected]> on behalf of Bill in OKC too via groups.io <wmrmeyers@...>
Sent: Tuesday, September 5, 2023 11:56 AM
To: [email protected] <[email protected]>
Subject: Re: [Unimat] end mill holder
?
I got one with a 8mm hole, ER-11, IIRC, with the intent to thread it M12x1 for my SL/DB machines. It's here somewhere! ;) IIRC, M14x1 needs a 13mm tap drill? I have a pair of very nice tungsten carbide 11mm tap drills for my M12x1 stuff. Works nicely on hardened steel, which most of those things are. For my ER-25 Collet holder that I "made" from one of the longer shank collet chucks, that was a hard skin, but the tap had no problem once the tapping hole was drilled. Made it pretty easy.?

Bill in OKC

William R. Meyers, MSgt, USAF(Ret.)?
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