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Is there a way to mask silver solder

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terry callaghan08/04/2019 13:31:40
141 forum posts
9 photos

hi out there is there a way to mask silver solder. I need to solder a bearing in place And to aline it I need to use a dumb axle. Is there a way to mask the axle from the solder. I don’t wish to end up with one solid lump. Thanks, michael

Brian Sweeting08/04/2019 13:46:49
345 forum posts
1 photos

Try Tippex.

Paul Kemp08/04/2019 13:48:54
259 forum posts
9 photos

Michael / (Terry?),

Tippex works quite well on exposed surfaces. Not sure how effective it would be on a shaft / hole though. Better approach might be to make the bush with an undersized bore and then line ream it in situ.

Paul.

not done it yet08/04/2019 13:49:33
2808 forum posts
11 photos

Carbon black? Or loctite it in position instead?

JasonB08/04/2019 16:23:54
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Moderator
15167 forum posts
1548 photos

Tippex works for me though it must be the solvent based one. Pic below shows two shafts being used to keep things in place during soldering and you cab see the white tippex on the shafts

here two pins set into a piece of flat bar which hold the two bosses in position, all coated in tippex

Part came off the jig no problem

Dave Halford08/04/2019 16:39:08
373 forum posts
3 photos

Rust can work or a nice coat of black scale on the dumb axle

Tim Stevens08/04/2019 17:15:48
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1010 forum posts

The trade method used to be to rely on jeweller's rouge, just mixed with water and painted on. If Tippex is Titanium Dioxide there is not much difference, I suppose.

I don't think carbon-black would suit as it is readily oxidised in a flame to a gas.

Tim

norman royds 208/04/2019 18:59:37
38 forum posts

nicrobraz I have a bottle the label is very faded all I can make out green stop off type 11 wall colmonoy ltd but had quick look on inteweb and the company is still going regard norm

Martin Evans 617/04/2019 22:31:59
22 forum posts

NIcrobraz stop offs, manufactured by Wall Colmonoy, come in three flavours - white, red and green.

From memory, White stop off is Titanium Oxide based, Red is Calcium Carbonate based - can't recall what is used in green stop off. I could be wrong - it was a long time ago.

Stop offs came as a paint-on liquid and also as wax sticks.

I used to be the technical sales rep for Colmonoy forty years ago; The UK factory (they are an American company with head office in Detroit) is just two miles from me in Pontardawe and they are going strong.

Martin.

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