Motor tuning.

[neity]

I have the keling g540 with 381 oz motors on all three axis. When i first ran through the g540 xml file in mach 3 i believe the steps was set at 200000 and it was traveling twice the diatance it should have. So i halved it and set it to 100000. Is this the correct thig to do? Also is there a way the motors should be set in tuning or is it case by case? I feel lile im missing a little accuracy

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[doorknob]

If it works, then I guess that it's OK to do it that way (I believe that Mach3 also has a mode where it calculates the proper setting based on the actual distance achieved vs. the expected distance).

If you wanted to calculate it yourself, then the G540 uses 10x microstepping and the 381 oz-in motors have 200 steps per revolution, meaning that Mach3 needs to send out 2000 step pulses to turn the motor one revolution. If you multiply that 2000 by your leadscrew's pitch (in turns per inch) you should arrive at the proper value for steps per unit (assuming you are using inches as your unit, and that you are not using any gearing or belt drive that would affect that ratio).

[neity]

Ill have to figure out the leadscrew pitch from cncfusion for the ballscrew kit.
Two other questions on this. The first is what about the acceleration and velocities? Is there a safer versus ambitious settings or guudelines for this?
Also i was told or at least under the impression that with the ballscrew conversion you dont need any assist on the z...but i feel like mine is working pretty hard going up. The lovejoy connector has lost its grip twice now on the ballscrew side and sometimes it makes unhappy noises. Cant seem to figure out why. I was thinking of reinstalling the spring assist tonight would that help me at all?

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[doorknob]

This would be a good time and place for people who have direct experience with the SX3 or equivalent to chime in...

[H500]

Are you sure the lovejoy is slipping? It can't happen unless the set screw is loose. It also wouldn't cause the motor to sound funny. The noise means that the motor has stalled.

I'm temporarily using a gear reduction on my sx3's Z axis. It gets about 70ipm with a 280 oz-in motor and a 34v power supply.

[Geekus]

Steppers = 200 steps / rotation (typical 1.8 deg per step steppers)
G540 does 10 microsteps
therefore 200 x 10 = 2000 steps per rotation
the Deluxe kit ballscrews have a 5mm pitch and there are 25.4mm/inch so:

25.4 /5 = 5.08 rotations of the ballscrew per inch

2000 steps/rev x 5.08 rev/inch = 10160 steps/inch

I am using the "zero" backlash couplings from CNCFusion and have not had any problems with them, may be worth checking out if it is the couplers causing you problems. If it helps I can send you my settings for steps per/accel and velocity (I use the deluxe kit).