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6" Vertex rotary table problem

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picclock:
I have a 6" rotary table which I use occasionally.
I have a real problem accurately getting the position of the centre of rotation. The MT2 centre on the table is not actually the centre of rotation. With a gauge on the inside of the taper the eccentric error is around 6 thou.

So can the MT2 taper be fixed with limited equipment ? (Mill, lathe etc) or
is there an easy way to set it up without using the MT2 centre taper? If so I can use it instead.

Best Regards

picclock

WeldingRod:
You can use an edge finder on the rim.

You could also cut a small step around the MT hole using an end mill and rotating the table to ensure it's TRUE to the axis.

Sent from my SM-G892A using Tapatalk

picclock:
@WeldingRod
Thanks for the reply. I think that the step-method will be best. I could then turn up some discs on the lathe with protruding centres which will align the parts to be machined. Certainly that should work for now.

Longer term I hoped to use an MT32 chuck to hold some parts but 6thou is just too much error. I suppose the only real fix (when I get round tuit) is to take it apart and machine/regrind the taper - toolpost grinder design anyone ?.. . been meaning to make one of those for ages .. .

Best Regards

picclock 

WeldingRod:
It would be utter insanity, but you could shim the table at the Morse angle and bore it while rotating...
I did mention insanity ;-)
Probably better to take it apart and use a lathe on it.

Sent from my SM-G892A using Tapatalk

hanermo:
Mount it on the mill, with the 7/x MT2 taper as tilt, with a grinding stone as the tool in mill.
Itīs how jig grinders work.

You are only taking off a few grams of metal.

I would expect any half decent effort to get around 0.01 mm TIR.

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