SOHC.co.uk Forums > CB750

Zinc Plating on Sandcast Site

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AshimotoK0:
Bryan   - Re Rim - Its one of those elusive k0/Sandcast parts - like the front hub which is 4mm wider than all later ones. Bet steff knows about it though,.

Cheers

Ash

steff750:
 ;) hi Ash yeah i have had a few sets of rounded rims,i think i still got one set here somewhere ;D i have not got round to chroming them,I'm afraid of the prices,( a rear mudguard cost me

AshimotoK0:
Hi Steff,

I already have both DID made rims new from Silvers before prices went up but they have the DID verbage on them and made in Indonesia.

OK it's not a Sandcast but Sandcast's don't have the same magic with me as other folk. We never had them over here so they could never have been the bikes we ogled at as a schoolboy (Well I was a schoolboy then). But mine is supposedly from the first elusive batch of UK bikes made in Oct '69 so I don't mind spending that little extra on it. I am not in it for the money. It's just my hobby restoring it to as near original condition as I can afford. (and one day riding it at last).

Cheers!!

Ash

UK Pete:
Hi Ash, thanks i can see the pictures now, the parts you have plated look real good, just out of interest did you use and airator, and a heater in your plating tank?
As for your rim it seems that very few people seem bothered about the rounded rims,
I recently bought a new old stock rear rim for the cb750, it is not the indonesia DID rim , it is original honda did rim , silvers had a few for sale so i took the oppotunity,
Pete

AshimotoK0:
Hi Pete,

I used a rotating contraption to rotate the part whilst plating. I used a brass slip-ring and carbon brush and holder off a washing machine to conduct the current during rotation. I used a lab power supply in constant current mode to control the plating current. I used the plating solution at 23 deg C I also wrote an Excel spreadsheet to work out the surface areas to get the correct current and used 100mA/sq inch

Best regards,

Ash

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