Hard Chroming discs

Camel, Sahara, Kanguro, Coguaro

Hard Chroming discs

Postby geoffmac » 01 Apr 2018 13:49

I have 3 Kanguro discs in various stages of decay. They need to be replaced with new (not sure that's possible) or re chromed. Does anyone know of a supplier who will re-chrome these for me?
Any help would be approciated
Geoff McGladdery
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Re: Hard Chroming discs

Postby Ming » 01 Apr 2018 15:58

http://thediscdoctor.co.uk/
https://www.ebay.co.uk/itm/Motorbike-mo ... 2701866913
Just from a quick Google - no recommendation, just an example of what's about.
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Re: Hard Chroming discs

Postby harrymuffin » 03 Apr 2018 21:19

Better off having them zinc plated, much more durable. Morn discs were only cosmetically chrome plated, like soap dishes in the bathroom and Japanese chromed bright work.
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Re: Hard Chroming discs

Postby harrymuffin » 03 Apr 2018 21:21

PS, There are a coupe of places in the West Midlands and a place in Bristol, but done properly it will be very expensive having had this type of plating done in the past.
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Re: Hard Chroming discs

Postby Butch » 06 Apr 2018 12:03

Would they be better just skimmed clean - or are they not resilient enough without the plating?
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Re: Hard Chroming discs

Postby harrymuffin » 06 Apr 2018 15:19

Original plating was for cosmetic appearances only. Chrome is porous and it is only if done properly - zinc then copper then chrome - will not rust. The zinc in sacrificial and the copper seals the surface to protect the zinc in the first place. Hard chrome plating is where the zinc/copper is done and then the chrome is deposited at anything over 0.001" and is commonly used to recover worn shafts die holds etc. I had a crankshaft big ends recovered by hard chrome plating and was not cheap even done as a foreigner. Aermacchi used to hard chrome plate the cam followers on there oushrod racing singles. Decorative plating is usually plated at less than 0.0005" and as mentioned before without the two base deposits, which is why bathroom chrome soap basket go rusty and why Japanese mudguards turn to dusty flakes when touched because the steel has reverted to ferous oxide and you then have a chrome outline which is not supported.
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Re: Hard Chroming discs

Postby norbert » 15 Apr 2018 15:27

The chrome of my discs diapeared a long time ago and they still work fine. It does not look like an exhibican bike, especially after standing in the rain. But breaking three times the rust disapears and it works :wink:

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Re: Hard Chroming discs

Postby Butch » 25 Apr 2018 13:09

Front disc on my 750 Bonneville was chromed and had worn half and half. Gave all of the impression of a warped disc presumably due to differing coefficients of friction.

Guzzi discs are plain cast iron and all the better for it.
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