I have a 10K spindle
in my 9” Workshop headstock.
I do use 6K/3C/3AT
collets.
I do not have a speed
closer. I do have 3 handwheel closers.
The 3C and the 3AT
have essentially the same threads but the 3AT is shorter, a bit larger in
diameter and has a different taper than the 3C.
I have two POT collets
for 3C.
I see no reason you
could not make a tube for the 3C to fit your speed closer.
You would need a taper
adapter sleeve for your lathe, to take 3C if you do not have one and a Nose
piece if you do not have one
Now a once in a
lifetime offer.
I have a brand new 6K
pot collet. Never used. It’s a big one, 4-1/2 OD.
I will probably never
use it. I have had it since about the time SB had their going out of business
sale.
I would be willing to
part with it. I am getting old and need to start clearing stuff out.
Not inexpensive but if
you are interested contact me off line.
I also have 3 6K SOFT
steel collets; a 1/8 a ½, and a 9/16” (9/16 could be 35/64. All are
unmarked.
They say Modern, 6K,
soft.
I think you could just
turn a shallow 1” ring in them. The OD seems to be 1-3/16 (1.178), the
key is 0.080 deep.
The ring might break
through the key.
Perhaps one of these
would do better; I would guess the 9/16 one could work.
These would be cheaper.
For my
decoder ring project, I think I want to use a pot collet (why are
they called that?) to clean up the back sides after parting. But I don't
want to chase down and pay for a 6K one.
In the mailing list archives, I find claims that the 10K spindle can
take a 3C collet, although you need a different closer because of
non-matching threads. (Online I've found claims that the collets are
totally different, but I guess I can trust the SB mailing list over some
guy on PM.)
However, I have the speed closer and I'd prefer not to give that up. Is
there an easy way to non-destructively modify that to be both 3C and 6K?
Can just the tube be replaced? This would be especially nice if I do a
mini-run of ~5 pairs of rings, which would be 30 pieces of similar
diameters. Wouldn't have to crank the handwheel all those times for each
piece...
