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Author Topic: Plating on the rotor casing  (Read 268 times)
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« on: Aug 15, 2017, 08:33PM »

If a trombone, lets say a Bach 50 with Hagmanns, was after market silver plated and the plating covered the inside of the rotor casing, but not the rotors themselves.

Would this be a problem for a trombone? Long term or short term
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« Reply #1 on: Aug 15, 2017, 08:52PM »

Not terribly likely.  Silver plating is less than one thousandth of an inch thick.  I doubt it would affect clearance (which is usually measured in thousandths -- more than one.
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« Reply #2 on: Aug 15, 2017, 09:34PM »

Further to the above comment, traditional electroplating requires movement of the liquid between the item being plated and the sacrificial metal supply ( silver), these areas such as the insides of tubes, or the insides of rotor casings / valve chambers etc are in a stagnant area of fluid movement, we find any plating happening in these areas to be incredibly thin. It can however affect the fitment of parts.

Most plating shops will cap of areas if you ask them too, so there is no chance of plating happening, but you need to specify this as most plating shops are not musical repair shops,

I had a customer pay a plating shop 1300 Australian dollars to have his trumpet replated in silver, nothing fitted any more when he got it back, it took around 6hrs of work to get everything to fit and slide nicely again.

Steve
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« Reply #3 on: Aug 15, 2017, 10:00PM »

I didnt think the plating should be too much of a problem... So how about this theory that the extra bit of material, the silver plate, causes the rotors to wear down quicker over time similar to a lapping compound?

Im trying to put forth a case in order to attempt to save an otherwise good Bach 50A3 from possibly being turned into scrap metal
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« Reply #4 on: Aug 15, 2017, 10:02PM »

Seems more likely that the brass rotors would wear off the layer of silver plating.
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« Reply #5 on: Aug 15, 2017, 10:42PM »

I didnt think the plating should be too much of a problem... So how about this theory that the extra bit of material, the silver plate, causes the rotors to wear down quicker over time similar to a lapping compound?

Im trying to put forth a case in order to attempt to save an otherwise good Bach 50A3 from possibly being turned into scrap metal

Brass and Silver are comparable in hardness, so unlikely one would exasperate the wear of the other, on the galvanic scale, Silver gives to Brass so no long term damage on this front.

Steve
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