Gnashing 127 teeth

[graffian]

You can use other gears, I mean less than 127T, to cut metric pitches. There are comibinations that get really close to metric pitches.

[BillTodd]

You can use other gears, I mean less than 127T, to cut metric pitches. There are comibinations that get really close to metric pitches.

Yes thanks. After several more hours of searching yesterday I found a complete solution here: (with or without the 127 tooth gear)

http://www.practicalmachinist.com/vb...d.php?t=116971

But, since I'm having to buy a complete set, I may as well get a 127 tooth.

[graffian]

If you can use a 127Tand have one thats the best solution. My ratio produced less error than the page you linked to. You never know the error might have made it closer than 127T due to leadscrew wear;-)

[Jon Lorton]

Be aware that Myford change gears are 14.5 degree pressure angle (PA) whereas the more common PA is 20 degrees. This might cause difficulties meshing with other, different PA, gears. In particular you could experience rough running (with cyclic errors in the thread cut) and rapid wear but may not be a problem so long as speed is kept low. You could also use 63 teeth as a conversion gear without much loss of accuracy. Have you tried HPC Gears of Chesterfield, Derbyshire ?

[John S]

Hardinge is also 14.5 degree PA.

That information is in the link that Bill posted

John S.

[Jon Lorton]

Thanks, I didn't know that