wirewound resistors - how are they made? (and rheostats, same deal?)
- From: dave <tool_box@xxxxxxxxxxxxxxxxx>
- Date: Sat, 31 May 2008 12:24:43 -0400
I guess nichrome wire wound around a ceramic core, then coated with (maybe?) epoxy. my biggest question: I assumed the resistance wire was originally UNcoated, bare wire, wrapped with each turn touching the next.
BUT
if it IS bare wire, then the makers either must keep each turn from touching the next turn over (with a very small clearance), *OR* the wire is coated -prior- to the winding process. otherwise, the 'resistance per turn' wouldn't be controllable - right? I mean like if one turn, near the middle of a wirewound resistor, was 'shorted' to the next winding mid-turn...
like in these things:
http://machines.scienceontheweb.net/shocker/photos/photo23.html
wirewound03.jpg
thanks for info, guys :-)
bubba here is kind of contemplating making a rheostat...this recipe calls for a 6 ohm, 11.1 amp type (see bottom right of page 2)
http://www.countryplans.com/vintage_farm//metalshop/AutoArcWelder.pdf
AutoArcWelder.pdf (application/pdf Object)
of course, i have this ol' powerstat, but it's a 5 amp model
http://machines.scienceontheweb.net/shocker/photos/photo16.html
powerstat07.jpg
.
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