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Re: Gears
A speed 900 is rather powerfull. So module 1. (module=size of teeth)
The axle is 5mm, meaning Z12 (12 teeth) as a minimum.
Smaller as that and the inner diameter of the gear gets too small .
Formula for this. Module*Z-(2,5*module)= 1*12-(2.5*1)= 9.5mm
Mechanical guideline, single stage, max ratio 8 to 1. (wormgears are an exception)
Max size for the wheel-gear is 12*8= Z96. But that's a problem in itself.
Because a gear has an outer diameter module*z+(2*module).In this case 96+(2*1)=98mm.
The wheels can't have any wear and tear. Or you're driving on the gears.
Therefor, 12 to 90 is the practical maximum to be used. Means gearratio 7.5-1
Then the rest of the calculations.
RPM of a speed 900 @12V 6600 rpm 100mm wheels.
6600/7.5 * (diameter in meter*pi)*60/1000= 16.57 km/h theoretical.
A speed 900 is rather powerfull. So module 1. (module=size of teeth)
The axle is 5mm, meaning Z12 (12 teeth) as a minimum.
Smaller as that and the inner diameter of the gear gets too small .
Formula for this. Module*Z-(2,5*module)= 1*12-(2.5*1)= 9.5mm
Mechanical guideline, single stage, max ratio 8 to 1. (wormgears are an exception)
Max size for the wheel-gear is 12*8= Z96. But that's a problem in itself.
Because a gear has an outer diameter module*z+(2*module).In this case 96+(2*1)=98mm.
The wheels can't have any wear and tear. Or you're driving on the gears.
Therefor, 12 to 90 is the practical maximum to be used. Means gearratio 7.5-1
Then the rest of the calculations.
RPM of a speed 900 @12V 6600 rpm 100mm wheels.
6600/7.5 * (diameter in meter*pi)*60/1000= 16.57 km/h theoretical.
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