Greetings, Jan! Your questions were:
- How do I keep my coil from unwinding when I take it off the
mandrel? - I'm going to cut the coil in a JR, is it ok to tape it
first to keep it from uncoiling? - Is it better to use dead soft
or half hard wire? etc.
The wire you are using, is it half-hard? The springy quality of
half-hard will explain any unwinding. Start with dead soft. It will
work-harden in the course of unfurling, measuring, and coiling.
I have had a coil collapse in the cutting phase. A lack of internal
coil support, ie, and expendable dowel, was the cause. Your coil
holder may be an older model with a shallow vee-trench, making
support highly necessary, especially where wire is fine and coil ID
is relatively large (my other problem).
Please no taping. Rather, lube the positioned and clamped coil.
Lubing the cutter blade causes the lube to sling off with centrifugal
force. Merry-go-round action!
To achieve your omelette, break many brass and copper eggs.
Indian Jewelers Supply Company