Turning

Subject:
By pulling with the drawbar
Response To:
How... ()

Raymond in Trenton NJ
Gary,

The drawbar pulls the collet into the taper. As it does that, the taper in the spindle squeezes the cut ends of the collet against your stock. The clamping force is phenomenal with a little pressure. You really don't have to crank the drawbar, bring it up snug plus a little. You can feel when the collet seats and also clamps your stock. Using drawbars are actually simpler to use than they appear.

Collets are ground to an 'exact' size then slotted. In use there is a diameter range where they can work. You don't have to be dead-nuts at 0.375" for a 3/8" collet to hold. I try to turn as close as I can to the nominal size, but I've had the collet 'shave' a bit as I pushed the tenon into it.

Just my experience and 2 cents.
Raymond

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