Why not go for a proper tool?
https://www.aliexpress.com/item/J41-Tapping-chuck-J4124-R8/32434340752.html
Cheers
Bengt
Den 2018-05-10 kl. 15:19, skrev Gene Heskett:
On Thursday 10 May 2018 08:02:57 andy pugh wrote:
On 10 May 2018 at 12:22, Gene Heskett <ghesk...@shentel.net> wrote:
This would, if a 3/4" R8 collet could be found with a D shaped bore,
be yet another way to remove one potential slip point in trying to
hold a tap for rigid tapping.
Buy a small-bore R8 collet and have it wire spark-eroded to a D-shape,
perhaps?
(You could consider plunge-eroding it yourself, I suppose)
Shirley, you jest. ;-) Yes, I could do it, but how would one go about
maintaining the concentricity in a home shop environment? Sounds fairly
impossible to me. With what I have for a psu, and the lack of suitable
pumping to keep the fluid clean enough to work well, it would take quite
some time to remove that much metal from 300 degrees of a bore. On that,
unless we can tie the feed into the achieved spark rate, and profile the
electrode movement to compensate for electrode wear... lots of ellipses
there, not to mention days of runtime. I think I'll pass.
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