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Machine 7, high quality air-cooled  restoration and performance parts
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Old 19-01-2021, 04:28 AM   #21
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Thank you for your magnanimous reply.

The only tool manufacturers' abrasive consumables I have used that come close to Norton et al are Metabo, but they are somewhat overpriced. Norton's Norzon and Zirconium abrasives are spectacularly good, but when at Atlas Copco Tools I found it incredibly difficult to convince even huge companies to invest in these time-saving abrasives. In industry, it's the person holding the grinder who is the most expensive part of any production costs equation.
This last bit kills me in laughter. It's 100% true but companies sure don't operate as if this were the case
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Old 22-01-2021, 10:32 AM   #22
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This last bit kills me in laughter. It's 100% true but companies sure don't operate as if this were the case
Too true - even when shown the payback data for decent discs, the bean counters still insist on buying cheap.
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Old 22-01-2021, 11:05 AM   #23
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I had to look that big word up

Do you have a link to the specific products you recommend? May give them a whirl
I don't have any specific links, but it's all cheap Chinese stuff off ebay! I use a combination of 115mm cutting disc, 100mm face grinding disc, and 4mm diameter ball point burrs in a die grinder for gentler work on smaller pitted areas. When I have ground out as much as I can/dare I chemically remove all remaining rust and sometimes lead fill the area. I find that the harder a material is, the better diamond abrasives cut, and whilst it scores the sound metal quite heavily, it doesn't seem to actually remove very much.

I always use a needle scaler first to remove the flaky rust as it's considerably quicker and less damaging, plus it will show up apparently sound but very thin corroded areas by punching trough or indenting, which it will not do on full thickness material.

Diamond abrasives are cheap enough to try out these days - you might like them!

I learnt the hard way never to encapsulate rust with the magical 'turns blue' garbage - as we know, the rust is still lurking ready to burst out beneath the microns-thick passivated surface...
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Old 24-01-2021, 02:30 AM   #24
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Ah yes, there is quite the difference between a rust converter and rust remover chemical. Rust converter is ok to use on light rust but if the rust is deep the converter won't always penetrate to the bottom of the rust pocket so there will still remain rust under what you think has been treated.

Always best to remove as much rust before using either chemical process.
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