To use those with a TTS or other 3/4" R8 (or 4C) collet you'll need adapter
rings. Like these.
https://www.tormach.com/store/index.php?app=ecom&ns=prodshow&ref=32432
They used to have thinner ones that had to be glued on with epoxy. Looks like
they're going (or already have gone) to making only the ATC compatible TTS
tooling.
Since you have a CNC lathe it shouldn't be difficult to make your own rings,
any dimensions you need to work on the mill.
Some quick searching turned up nothing of collets with D shaped holes. Take a
standard 3/4" R8 and have a couple of holes EDM cut so you can pin a piece of
steel inside?
On Thursday, May 10, 2018, 5:26:34 AM MDT, Gene Heskett
<ghesk...@shentel.net> wrote:
Greetings;
Looking around for some more cheap metric ER-20 stuff, I stumbled over a
kit on ebay that had the TTS like adapter as part of the kit. So I
bought 2 sets of them. $40 a copy, or $79.something for 2 sets.
The adapter looked like it was the std 3/4 diameter stem. But when they
arrived, the 3/4" diameter stem had a full length flat, like it was
intended to be used in a spindle with a 3/4" bore and set screws.
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.
The url if it still exists, and if you look close, that flat on the shank
can be seen, is:
<https://rover.ebay.com/rover/0/e11400.m43.l9264/7?euid=7c62a50e819349c08674ae7428756b5f&bu=44688966138&loc=https%3A%2F%2Fwww.ebay.com%2Fsignin%2Fg%2Fv%255E1.1%2523i%255E1%2523I%255E3%2523f%255E0%2523p%255E3%2523r%255E1%2523t%255EUl4xMF83OjNDMjBBMzE5OTc4RTI1QjVBQzJBMEI0MTZERDFBNUJGXzJfMSNFXjI2MA%253D%253D&sojTags=bu=bu>
Has anyone else seen such a R8 critter, and what would it be called so it
can be found in the throngs of such stuff from the asian's?
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