Originally Posted by Perp  Massajamesb, for the Gear and rack you recomended above, at what gantry weight/servo power/speed does the chance of striping teeth start to be a concern? or is this ever an issue at all? I am looking around 100 lbs gantry with Tom C's 850 oz servos(dual drive) and around 10:1 reduction for a plasma table I am building.
Thanks
Doug |
Perp, I weighed my gantry (roughly), and altogether, gantry, carriage, torch, Z axis, motors, motor mounts yadda yadda, everything mounted on that axis, comes out to right around 80 pounds.
The thing to remember is that your spur gear doesn't really see that weight directly, as the weight of the gantry is actually on your bearings. What the spur gear "sees" is the force needed to move the gantry forward/backward, and then come to a sudden stop when neccesary.
This is not enough force to strip the spur gears that most of us are using, as long as your gantry is able to move smoothly.