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Any Mathmatitions On Line (lathe change wheels)

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doubleboost:
Hi
I have borrowed a 63 tooth change wheel to use as a conversion (metric to imperial)
This works very well
I want to make my own but can only get 64 teeth with my deviding head
As the 63 is half of a 127 (should be 63 1/2 )
How much difference would a 64 make
John

shipto:
Could you rig something to use the cog you have borrowed to do a straight copy?
I also could use a 63 probably the same as yours since I believe you also own a Harrison so if you figure it out I would be interested. Also I would be interested to compare the tooth counts for the gears you have now.

mattinker:

--- Quote from: doubleboost on August 30, 2015, 05:23:53 AM ---Hi
I have borrowed a 63 tooth change wheel to use as a conversion (metric to imperial)
This works very well
I want to make my own but can only get 64 teeth with my deviding head
As the 63 is half of a 127 (should be 63 1/2 )
How much difference would a 64 make
John

--- End quote ---
Can't you make an adapter for the Sparey dividing head?

Regards, Matthew

Will_D:
John,

What is your proposed gear train?

And what is your leadscrew pitch?

trapper:
How many holes do you have in your available dividing plates? As the difference you were asking 360degree divided by 63=5.714 Your thinking of cutting the nearest to that you can get with your available tooling 64teeth so 360 divided by 64=5.625 a difference of .089 of a degree.Which is less than 1/10th of a degree -so your pitch on your 64 teeth would be 1/10th of a degree closer than they should be ,not much,but be easier and more precise with the correct plate-take it you are going to do this on a mill.

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