On Fri, 25 Jun 2010 04:10:24 +0000, DoN. Nichols wrote:
On 2010-06-25, Searcher7 wrote:
[re large black ring on an unusual 5C collet closer]
But how does one keep it from turning under cutting forces?

Pray that the anti-rotation pin works? Look for a place where
the small pin slides into to prevent it from turning? Add provisions
for clamping the ring to the sleeve which holds the body? Run your
lathe spindle in reverse? (I think that is not an option on your lathe
anyway.)
....

Reverse rotation is a standard feature on Sieg 7x10/12/14 minilathes.
In first picture* at http://www.mini-lathe.com/Features/features.htm
three controls are visible above the words "Mini Lathe" -- a bat-handle
3-position toggle switch for motor Forward/Off/Reverse, a Power On/Off
rocker switch, and the speed pot. The 4th and 6th pictures**, about
halfway thru the file, show the Forward/Neutral/Reverse gear lever that
controls leadscrew rotation relative to spindle rotation. (The next
picture after that shows the bolt holes in the nose of the spindle and
the thru-spindle hole.)

* Also http://www.mini-lathe.com/Mini_lathe/features/Controls_y.jpg,
the 4th-from-last picture, has a clearer view of the switches and pot.
Boxed RPM numbers apply when High/Low lever is in Low.

** http://www.mini-lathe.com/Mini_lathe/features/Levers_y.jpg

--
jiw