I can gear it down considerably with the 17 tooth gear. but gearing it to .1 degree would take up a lot of room!
Worm gears give good reduction per space requirement. A single start worm with a 30 tooth gear will get your 7.5 degree step down to 0.25 degree.
at £15 a piece.. or am I just being a cheapskate?
on the note of working out gear ratios I'm getting into a bit of a muddle...
on my motor's output shaft I have a 17 toothed gear. I'm trying to work out the number of teeth per step so... (answers rounded to 2d.p)
48/17= 2.82 - so that is the amount of teeth per step
7.5 degrees/2.82=2.65 - the angle of rotation per tooth
So I want the out put gear to turn .5 of a degree per step.
2.65/0.5=5.3 - the ratio between the angle per tooth on our small gear and the angle on the big gear.
5.3*17=90.1 - this is the ration multipled by the small gears teeth which gives us 90.1 (we will call it 90)
so I need a 90 tooth gear to achieve a 0.5 degree rotation per step? am I right or am I crazy?
CHeers