[ATM] Re: ATM Digest, Vol 15, Issue 9

["Tom and Beth" <tomandbeth@theriver.com>]

Don,

  As one of those who seems to break taps, is there a summary of
recommended hole size/drill bit to taps? Maybe something I could print
out and keep in the case with the taps. I'm gathering from your other posts 
that different materials will also affect hole size.

Thanks
Tom...all thumbs
Tucson, AZ
 Date: Fri, 04 Mar 2005 13:21:40 -0800
> From: "Don Clement" <clement.focuser@verizon.net>
> Subject: Re: [ATM] Cutting thread in aluminium
> To: <atm@atmlist.net>
> Message-ID: <000801c52100$28b47980$6401a8c0@hugo>
> Content-Type: text/plain; charset=iso-8859-1
>
> I have found that a better way to tap aluminum is to use a forming or roll
> tap. This type of tap does not cut, but  forms (forges) the threads. There
> are no chips developed using a forming tap so forming taps are especially
> well suited for blind holes. Because threads are formed (forged) rather 
> than
> cut, the threads are much stronger. See. http://www.balax.com/forming.html
> Caution: tap drill size is a larger diameter for a roll tap than for a
> cutting tap.
>
>
>
> Don Clement
>
> Running Springs, California
>

_______________________________________________
ATM mailing list http://www.atmlist.net/