My homemade piston ring grinder, made from many recycled parts, the grinding wheel is a diamond flat sided wheel, she has a nip plate and a concentric cam wheel that can be positioned in several different holes in it for rings up to 100.00mm.
Here I quickly and accurately remove 3 thou from a ring, the way the table swivels and keeps the ring end square so when the ring is fitted it is paralell to both sides of the ring gap.

Showing how this unit was made to give those with the ability to have a go making something similar for themselves, see links below.

Part 2, [ Ссылка ]
Part 3, [ Ссылка ]
Part 4, [ Ссылка ]

Thanks for looking

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