gear speed ratio accuracy
gear speed ratio accuracy
(OP)
If I had a gear train with speed ratio of 300: 1
if an input speed into it is 0.3 m/s. Then the output speed should
theoretically be 1 mm/s.
Although in a gear pair each member has a whole number of teeth,
which fixes the transmission ratio in terms of integral number of
turns, the instantaneous ratio is likely to flutuate a bit. Of
course this depends on the accuracy of the teeth finish.
For example, if the teeth profile was very roughly done, then during
a portion of a teeth engaging another teeth, the speed ratio may not
stay constant.
My question: is it possible to have an accuracy of 98%-99% at all
times. so that the output speed at any instant does not deviate more
than 1 or 2% away from the theoretical value of 1mm/s.
Another way of wording it is: Are there any actuators (servo)
capable of a slow speed of 1mm/s with very good instantaneous speed
accuracy, so that at any instant, the real life speed is no more than (0.02)*(1mm/s) off the theoretical speed of 1mm/s.
Thanks.
if an input speed into it is 0.3 m/s. Then the output speed should
theoretically be 1 mm/s.
Although in a gear pair each member has a whole number of teeth,
which fixes the transmission ratio in terms of integral number of
turns, the instantaneous ratio is likely to flutuate a bit. Of
course this depends on the accuracy of the teeth finish.
For example, if the teeth profile was very roughly done, then during
a portion of a teeth engaging another teeth, the speed ratio may not
stay constant.
My question: is it possible to have an accuracy of 98%-99% at all
times. so that the output speed at any instant does not deviate more
than 1 or 2% away from the theoretical value of 1mm/s.
Another way of wording it is: Are there any actuators (servo)
capable of a slow speed of 1mm/s with very good instantaneous speed
accuracy, so that at any instant, the real life speed is no more than (0.02)*(1mm/s) off the theoretical speed of 1mm/s.
Thanks.





RE: gear speed ratio accuracy
I suggest you do a literature search on gte, gear transmission error, to find out whether that is necessary, my gut feeling is that a hypoid gear set is better than 99% already.
Cheers
Greg Locock
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips.
RE: gear speed ratio accuracy
RE: gear speed ratio accuracy
Further improvement might be gained by bedding in with a very fine abrasive and some extra pre-load, then washing clean and readjusting to slight pre-load.
Regards
eng-tips, by professional engineers for professional engineers
Please see FAQ731-376 for tips on how to make the best use of Eng-Tips Fora.
RE: gear speed ratio accuracy
http://www.exlar.com/