Thanks for the replies guys. That stuff was really informative. I Plugged around a bit with the formulas somewhat and it seems to be based on the weight to be lifted against gravity, friction, etc, as per the formulas, something relatively low in terms of torque might cut it, as little as 50ozin maybe, 10lbs @ .005 rotation and a .4 efficiency on an acme ball screw results in somethng like ~.12Nm required, or roughly 16oz in. Now ofcourse this means I need enough torque to be able to accelerate to the 2000steps per second. This may seem low to others but please remember that this is more of a pick and place machine then anything like machining. I dont need to force a tool into a chunk of metal.
So, Microstepping might be nice, and I do plan on using it if I get a capable controller. Question, is microstepping as effective in preventing resonance and stalling problems on a 1.8 degree motor as something with bigger steps, such as a 7.5 degree motor. 1.8 degrees seems very standard but I could go for larger steps if there arent any side effects that I dont know about.  |