ML7R/Bearing ‘Rumble’

[Martin KyteParticipant @martinkyte99762]

Absolutely.

[AjohnwParticipant @ajohnw51620]

Interesting link Michael. It shows how a bed can be reground without removing a lot of material but slideway grinding people seem to be reluctant to do it that way. One variation due to errors in the table on the grinder is to stand the bed on parallels where the feet will be when it's turned over and then grind the feet.

My father told me his approach. He measured the bed and told them if they did it their usual way he simply wouldn't pay them. He had machines reconditioned regularly and reckoned that the reconditioners often wrecked them. I'd assume in respect to high precision machines where bed wear of even a few thou counts. It wouldn't matter on a lot of general lathe work.

There usual comment doesn't make much sense either if people think about. We remove 0.030 and then add stick on and things come back to where they were – only if they set up rather precisely before they do it.

Out of interest on my ML7 the biggest problem in respect to apparent bed wear was the saddle particularly where it ran against the side of rails – gib strip too. Even so if that was fixed even a near thou variation in the width of the rails interfered with adjustment.

I did manage to get some slideway people to regrind the cross slide lightly but had to point out that I wouldn't be happy if it turned concave by more that a thou or so.

Some people that worked on my Raglan made an interesting observation about fitting the saddle. Don't use shims. Measure carefully and we will grind up spacers for you. They reckoned that was the best way to do it and realised why i wanted a high precision lathe – no cylindrical grinder available. Trying to get the equivalent of perfect DSG at home in other words. I still keep trying.

John

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