Bruce - do you remember what sort of sensor was used to provide the
electronic feedback from the vacuum stack?

Hul


Bruce L. Bergman wrote:
On Thu, 13 Aug 2009 08:36:39 +0100, "N_Cook"
wrote:
Unfortunately the UTS of such wire is about 5 ounces, before any work/age
hardening or imperfections, so any more path resistance more than the
minimum will cause a break. The felt slip clutch for back tension at about 2
ounces was too high, wide brroke after 1000 turns, and I had to reduce it
to about 1 ounce.

If you were going to do this a lot, you might have to build an
unspooler to handle the wire - same thing they used on old computer
mainframe tape drives, a vacuum stack to pull a slack loop off the
reel and a motor drive with electronic feedback from a slack stack box
to control the wire reel. The straightener would not be pulling
straight off the reel, just from the slack box.

But that would be as you build a production machine to wind the
coils in bulk, thousands a day. For one or two a year it would be
nuts to spend that kind of money and wastye that kind of effort.

-- Bruce --