Thanks for checking I will keep looking...? Not a typo.
Cheers
David

Use Mach3 calibration to get it spot on.

Hi All
I did further testing today. I isolated the Z axis from the machine and got a counter onto the pulses out of Mach3.
I found mach3 pulses out to be correct (No surprise.)
I then set pulses per unit to 1600 to match the stepper drivers setting. I then counted revolutions of the MotionKing stepper motor. Always about 6% revs indication more than actual moved.

On Testing I found that 1700 pulses per set into mach 3 give the correct number of turns (allowing for the 5:1 ratio on the gear box).
So my testing has shown that the Motion king driver needs 1700 X 5 pulses to drive the stepper motor with gearbox one revolution. According to the instructions with the driver and stepper motor this should need only 1600 X 5 pulses per rev.

Is anyone else using MotionKing drivers and motors?
Cheers
David

Hi
I have four 34HS9801-G5 MotionKing stepper motors
I have been trying to work out why my mech mate does not move the correct distance(accordind to theory). So I put a signal generator onto the step input and measured the time for a number of revolutions using the MotionKing driver. (tried DC supply and AC supply to MotionKing Driver, no difference)
I always needed 17/16 more pulses than theory said I needed.
I changed to a gecko drive and repeated the test with a bench power supply and wiring direct to the motor. Still needed 17/16 times more pulses than the expected 200 steps at the motor X 5 for the gear ratio.

My conclusion is that the gearbox is not exactly a 5:1 ratio.
I have not seen any other problems with the motor or drive.

Hi
Just redid calcs and set the new numbers into Mach3 put it all back together, still out by 1-2mm in 1000. ???

Did many of you guys get the exact number or does everyone set up by adjusting afterwards?

Cheers
David

Mine calculation was

200 steps * 10 microstep = 2000
2000 * 3 times belt reduction = 6000 steps per rev
travel per rev = 3.14159265 (tooth distance = Pi) * 30 tooth = 94.2477796

steps per mm = 6000 / 94.2477796 = 63.6619662

but using dial indicator and mach calibration from SETUP page for one axis it was lower than 62 steps per mm, and other greater than 64. It must be because of in precision in motor movement as I think belt gears are pretty much the same.

10 micro steps per pulse is not a practical setting, almost all the article I read says 1/8 is the highest practical setting. maybe this is the problem.

Hi Ken
10 micro steps is standard for the Geckodrives

Cheers
David

Thanks Danilo

That is very close to the variation I have found. It will be good to hear some more if they got it exact.
thanks again
David

Ooops, I don't use Gecko :p

Have got 5 tables running with 3 different motor/gearbox combinations and 2 different rack suppliers/pitches. ALL of them were set to the calc and needed no tweaking afterwards.

Thanks Gerald That is what I expected. I will keep looking.
Cheers
David

Please somebody give me an advice. If my Motors 86HS9802 is
200 steps * 10 microstep = 2000
2000 * 3 times belt reduction = 6000 steps per rev
travel per rev = 3.14159265 (tooth distance = Pi) * 30 tooth = 94.2477796

steps per mm = 6000 / 94.2477796 = 63.6619662
what "Move speed mm per minute" and what "Min freq. kHz" is ok to use thank you

These are same as mine, I use Velocity = 18000 , acceleration = 600, this works with 25khz kernel speed.

thanks Danilo ... did you cut at that speed and what materials

Those are rapid move G0 feedrates. For cutting I rarely use over 4000mm/min

Was this whole conversation, a discussion on what Mach 3 does automatically for you when you tune the motors?