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Synchronome dial mech repair.

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Joined: 21 Apr 2015
Posts: 134
Location: near Penzance UK

PostPosted: Sun May 22, 2016 4:31 pm    Post subject: Synchronome dial mech repair.  Reply with quote

Thought I'd break the duck in this section ! Last week I scored another MK1 off eBay for a reasonable price ( I know I said I wouldn't buy any more Smile) Only problem I know of is that it has a quartz mech behind the dial - I will be collecting it next weekend. I immediately scored a pair of 'nome mechs also off ebay and they arrived yesterday. One was dirty but works ok but the other has clearly been connected to the mains. It was still inside the 2 part tin, the coil was blackened and very low resistance, the resistor was burned out and the resulting smoke had condensed on all the brass work.
I stripped it and cleaned all parts in Horolene. I stripped the burned out windings and found I had a reel of the right gauge enameled wire. I knew it would be impossible to get perfectly neat layers without a coil winding machine but I tried anyway with an electric drill held in the vice. In theory you shouldn't be able to get as many turns on with hand layering but the end result has the same resistance as a good one - and works perfectly.
If anyone ever tries this, before you start note the clearance between the coil and the ratchet wheel. Your layering will probably be a bit lumpy but make sure as best you can that lumps don't occur near the centre. Don't let go the pressure of the end until it is secured. It will unwind in a flash ! Unless you are lucky enough to have some empire cloth to finish it off with use self amalgamating tape - just two turns side by side with the overlap opposite the area which will be closest to the Ratchet wheel. Ordinary electrical tape will go nasty in time. Obviously this isn't  the only way to do it but I posted this encourage others with a duff coil.
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Joined: 24 Apr 2015
Posts: 70
Location: United Kingdom

PostPosted: Sun May 22, 2016 7:15 pm    Post subject: Reply with quote

I hate winding coils, done about half a dozen. I usually use a hand drill (manual one you know with a crank, they're quite rare nowadays.). I find that the lumpiness starts at the ends where you change direction and then slowly spreads towards the middle. Aaaaargh!

I started collecting slaves in the same way as you, buying ones that needed restoration. A couple defeated me, but did yield working movements. I have re made hands and for one had a new dial printed.

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