I use a similar technic to that which Peter R. uses, but instead
of drill bits as my mandril, I have an assortment of brass tubes
of various diameters to use as mandrils. I generally make these
about six inches long and cut a slot about one inch long in one
end of the tube. The tubes are placed directly into my turning
device ( I use three different ones). If, however the diameter of
the tube I need to use cannot be chucked into the device, I have
a wooden dowel turned down to fit inside the tube and also
treated to fit into the chuck.
The three devices used for turning are 1. the flexshaft
handpiece which is plugged into a speed control unit allowing a
slow speed turning, 2. a rechargeable screwdriver which has
chucking head (hardware item) attached instead of a screw bit. I
like this since it rotates slowly, and rate can be controlled
easily. or 3. An old fashion hand cranked drill held in the
After turning up a length of coil, I remove the mandril and
coil of jump rings from the chuck, and, after sliding the coil
down to the slotted end of the tube, I quickly cut thru the
rings over the slot with the separating discs. Peter, I’d like
to know where to get the .006 discs. I’ve only used the .009
ones, but would prefer the thinner ones for obvious reasons.
If some of you would try this, I think you'd be delighted with
the ease and rapidity with which you can produce jump rings.
For what it’s worth. JZD