Re: 42 AWG/ 47 SWG copper magnet wire coil winding query

In article <s9s985h0b3beavdat7fde678rjp9d6sa4t@xxxxxxx>,
Bruce L. Bergman <bruceNOSPAMbergman@xxxxxxxxx> wrote:
:On Thu, 13 Aug 2009 22:57:47 +0000 (UTC), dbr@xxxxxxxx wrote:
:>Bruce L. Bergman <bruceNOSPAMbergman@xxxxxxxxx> wrote:
:
:>> 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.
:>
:>Bruce - do you remember what sort of sensor was used to provide the
:>electronic feedback from the vacuum stack?
:
: Never worked with one, but yes, I was just old enough to remember -
:they used a series of optical sensors to determine how much slack was
:in the box on either end of the tape drive. And a vacuum to suck the
:slack down into the stack box.

The only old tape drive I had a chance to examine closely had vacuum
sensors at two levels at the back of the column plus a flow sensor in
the vacuum line. Top sensor sees vacuum --> not enough tape in the
column. Bottom sensor stops seeing vacuum --> too much tape in column.
Excessive flow --> tape broken or not loaded. Pretty straightforward
and reliable. Might not work as well with wire as it does with tape
since the tape column is much, much wider than the gaps between the
tape edges and the front and back walls.

--
Bob Nichols AT comcast.net I am "RNichols42"
.

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