gear ratio

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11 Dec 2010 22:23 - 11 Dec 2010 22:25 #5977 by billykid
gear ratio was created by billykid
hello, somebody can tell me the best gear ratio with DC servo motors ih closed loop?
I now have on the motor pulley 20, 28 on the ballscrew 5mm pitch.
almost 3.2 mm per motor revolution.
I would like if possible to increase the gear ratio to improve accuracy
without encountering other problems even in small fast movements
Regards
Mauro
Last edit: 11 Dec 2010 22:25 by billykid.

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13 Dec 2010 20:08 #6007 by grd246507
Replied by grd246507 on topic gear ratio
Hi

Both my cnc mills have a 2:1 ratio, 2.5mm per motor rev with 5mm pitch ballscrews, I find this still gives a fair rapid speed and the movements
on small moves are much smoother because the servo has more of a chance to make a full movement to complete its commanded move overcoming stiction of the motor better and not as jerky as 1:1 that I have seen and used on some machines.

Hope this helps

Regards Gary

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15 Dec 2010 21:25 #6064 by billykid
Replied by billykid on topic gear ratio
Thanks Gary

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15 Dec 2010 22:50 #6067 by andypugh
Replied by andypugh on topic gear ratio
The best ratio depends on a whole lot of other factors, such as the torque/speed characteristic of the motor and the required cutting force.
You probably want the highest ratio which will give acceptable rapid speed, though that is not a trivial calculation.

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