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Re: Breaking off a tap?!

To: shop-talk@autox.team.net
Subject: Re: Breaking off a tap?!
From: David Scheidt <dmschei@attglobal.net>
Date: Thu, 6 Mar 2003 22:43:08 -0500
>  > You can get away with using
>>  just a taper tap for a through hole in relatively thin material.
>
>Through holes, use a gun tap.  And don't back off.  The gun tap pushes the
>chips forward, so you you tap in one pass.

That's a spiral fluted tap, right?  They don't work as well in 
non-ductile materials, which don't form such long chips.


>One instructor I had always used a gun tap in blind holes, also.  He did
>half the hole with the gun tap (no backing off), then removed it, blew out
>the hole, and finished with a plug tap.
>
>>  Good cutting fluid is a must when tapping.
>
>Except in cast iron.  Always tap cast iron dry or the stuff can crumble on
>you.

Hmm.  Many of the cutting fluids I've used claim to be suitable for 
tapping cast iron.  I don't tap many holes in cast iron, so I don't 
have any experience.

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