Gallery, Projects and General > How do I??
Any Mathmatitions On Line (lathe change wheels)
vtsteam:
Well if you're comparing to a 127, 63 is half a tooth off, and 64 is a half a tooth off, both in opposite directions. So the amount of error is the same, just depends on whether you want the pitch slightly long or slightly short.
I'm not a mathematician, so apologies if this is simplistic and inaccurate.
Swarfing:
John can't you just strap the change wheel to the back of the dividing head, rig up a locking pin against the teeth and grind a form cutter to suite the teeth? no maths and an exact copy?
vtsteam:
127 by the way is half of 254, which is the usual approximation of the number of mm in ten inches. That's how it converts the pitches.
63 and 64 are both as close as each other to half of 127 (63.5). I don't think there's much to choose between them, unless there's some other reason one is better.
127 would be better than either, but then you get into a pretty big gear to fit the trains of some lathes. That's why they go to approximately half that.
chipenter:
Can you not use the 63 gear to make a 63 ring for the divideng head ,
trapper:
The easiest way would to borrow the apropiate plate. Formula : 40/n -40/63 so a plate such as a 126hole plate would be ideal but any plate divisable by a number that can go into 63 would cut 63 teeth.Its approx 5/8turn of the crank
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