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Hi everyone, thx for all the replies. I have a mobile knife sharpening business hence the high usage and so yes I do transport the unit around in my vehicle. I always keep it tied down but I don't remove the wheel during transportation. I do have a truing tool and will use that to bring it back to circular (at a big loss of about 5mm of stone though 😢) and then keep an eye on it.

As I watch the stone rotate I don't see any obvious wobble to the drive shaft but I guess a small wobble in the drive shaft could be exaggerated at the extremities of the stone. There is no vertical movement in the stone though so hopefully that also indicates that the drive shaft is straight.

Great forum. Stay well. Dozzy

I have had my tormek grinder for 8 years and have used about 5-6 stones in that time. My latest stone which is about 4 months old (now about 220mm in diameter) is starting to become non circular. This has never happened to me before on previous stones. The stone is about 5mm out of circular. It appears to have a bulge on one side so as its rotating, the stone appears to rise and fall as if it is not mounted through the centre of the stone. (Im trying to be as descriptive as possible so you can understand what I'm talking about)

I suspect it's got something to do with the rubber drive wheel although as its running I can't see any movement in the drive wheel.

Has anyone else experienced this?

Thanks. Paul