calculation for nod on milling machine

This topic has 3 replies, 2 voices, and was last updated 3 April 2018 at 21:03 by paul rayner.

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2 April 2018 at 21:08 #25921
paul rayner
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@paulrayner36054
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2 April 2018 at 21:08 #348571
paul rayner
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@paulrayner36054
Hello all

I've just got round to installing my new super major milling machine (I had it delivered last dec). A few small problems with it but I have got them all sorted apart from the nod. I've got +0.09mm on the inboard side and -0.08mm on the outside over a 100mm radius. The X axis is now bob on. Question is how do you calculate the size of the shims I need to put under the column? I know I will still have to measure it after but it would be better if I had a ball park figure to start with.

Thanks all in advance

Regards

Paul
2 April 2018 at 22:37 #348577
Clive Foster
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@clivefoster55965
Assuming you have holes in the shims for the bolts to go through.

Ratio of the shims to your measured error is the same as the ratio of the measurement diameter to the bolt spacing.

Measured 0.17 mm error in 200 mm so if bolts are 100 mm apart you need 0.085 mm / 3.3 thou of shims.

Clive

Edited By Clive Foster on 02/04/2018 22:38:06
3 April 2018 at 21:03 #348717
paul rayner
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@paulrayner36054
Thank you Clive I will go and measure my bolt spacing

regards

Paul
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calculation for nod on milling machine

calculation for nod on milling machine

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