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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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6th Jun 2017, 8:52 pm | #1 |
Dekatron
Join Date: Mar 2008
Location: St. Frajou, l'Isle en Dodon, Haute Garonne, France.(Previously: Ellesmere Port, Cheshire, UK.)
Posts: 3,183
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Old Variac stiffening up
Hi,
I have a very old Variac that uses a thin walled Bakelite tube to carry the moving contact while insulating it from the frame & handle. The tube is a snug fit through the brass top plate and, after a time, becomes tight due to the tube 'swelling' a tiny amount due to Bakelite being slightly absorbent. Now, if I enlarge the hole in the top plate a bit to allow free motion once again, will the tube continue to expand and become tight once more, or will it finally reach a 'limit'? Cheers, Pete.
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6th Jun 2017, 10:58 pm | #2 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,107
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Re: Old Variac stiffening up
I think it will stabilise, but will defer to anyone who has more gen on this subject.
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