Fw: [ATM] Cutting thread in aluminium

["Don Clement" <clement.focuser@verizon.net>]

> Hello Goran, (I posted this to the list becuase I was unable to send
direct.)


> Almost any industrial supply house will stock cold forming taps. Try
> http://www.mcmaster.com/ and search for cold forming taps or roll taps.
They
> may not specifically state the brand name Balax. I mentioned thread
forming
> taps because I routinely tap many blind 4-40 holes in 6061-T6 aluminum
(each
> of my focusers has 144 blind tapped 4-40 holes) and get excellent results
using
> cold forming taps with very little  tap breakage. The  formed threads are
> much stronger than cut threads in aluminum. Screws don't strip out as
easily with the
> formed threads from roll taps.
>
> Don Clement
>
>
>
>
> > Any post order place where you can buy this type of taps in small
> > quantities?
> > Goran
> >
> > Don Clement wrote:
> > > 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.

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