Torque and RPM...


Is it best to use a small drive pinion on the rack with higher motor rpm or larger pinion with lower motor rpm??


A 20t pinion will move 62.83mm/rev and at 3:1 reduction I will need 429.73 motor rpm for 9000mm/min travel.


A 32t pinion will move 100.53mm/rev and at 3:1 reduction I will need 301.58 motor rpm for the same speed.


I am fairly certain a larger pinion meshes better than a smaller one, but what size would be best considering my 3.1Nm motors.


My existing table is belt drive but works out at 100mm/rev travel and 300 motor rpm for 9000mm/min speed. When i did my high speed test it was running at 450 motor rpm so I know they can reach at least that.


I have a heavier gantry on the bigger machine, but also twice the motor power as i'm using two slaved motors.


Any views guys?