Advice please

[m_c]

Ok I'm getting 1 revolution on the small pinion attached to motor. @ 16mm movement with 100spr

So that tells us the microsteps are correct, as with those settings and distance, the controller is sending 1600 steps.

Are you sure the 18:90 gearing is correct for the pulleys?
And everything is moving smoothly and not stalling?

[D-man]

So that tells us the microsteps are correct, as with those settings and distance, the controller is sending 1600 steps.

Are you sure the 18:90 gearing is correct for the pulleys?
And everything is moving smoothly and not stalling?

Yeah everything runs lovely, i will count them again to make sure 2 mins

[D-man]

So that tells us the microsteps are correct, as with those settings and distance, the controller is sending 1600 steps.

Are you sure the 18:90 gearing is correct for the pulleys?
And everything is moving smoothly and not stalling?

Yep, defiantly 18 teeth on motor side and 90 teeth on large pulley to pinion


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[m_c]

Yep, defiantly 18 teeth on motor side and 90 teeth on large pulley to pinion

In that case it is definitely a 5:1 ratio, so with the 100 step setting, the big pulley should turn once with a move of 80mm (16x5).

Once that's confirmed, work out the tooth pitch. Measure over as many teeth as you can, then divide your measurement by the number of teeth you've measured over, then multiply by the number of teeth on the pinion (23).
Then that will give the distance one revolution of the pinion should give.

Then divide 8000 (number of steps for one revolution), by that distance, which should give you the correct steps per mm.

[Greeny]

Deleted as no longer relevant

[D-man]

Thanks for all your help guys, ive managed to dia it in. Completely my fault i think. managed to get it within 1mm and fine tuned it with mach3 settings

[D-man]

Guys whats the best way to find out the pitch of the Z screw?

[m_c]

Measure it would be the obvious answer, but I'm going to guess it's buried out of sight.

Do you know if it's got any gearing between it and motor?

If it's all totally unknown, I'd set the steps/mm to 10 or 100. I'd probably try 10, and if you don't get much movement jogging, up it to 100, or maybe even 1000. You want to be able to jog at a reasonable speed. Too low a setting and it'll hardly move, too high and it'll be hard to control.

Then jog over a reasonable distance that you can measure accurately.
Then divide the commanded movement by the actual movement, and finally multiply the steps/mm by that figure.

So say you use 100 steps/mm. You jog 20mm, yet the machine moves 35mm. 20/35 = 0.571439 Now multiply that by 100, and your steps/mm should be 57.1439.

[D-man]

Measure it would be the obvious answer, but I'm going to guess it's buried out of sight.

Do you know if it's got any gearing between it and motor?

If it's all totally unknown, I'd set the steps/mm to 10 or 100. I'd probably try 10, and if you don't get much movement jogging, up it to 100, or maybe even 1000. You want to be able to jog at a reasonable speed. Too low a setting and it'll hardly move, too high and it'll be hard to control.

Then jog over a reasonable distance that you can measure accurately.
Then divide the commanded movement by the actual movement, and finally multiply the steps/mm by that figure.

So say you use 100 steps/mm. You jog 20mm, yet the machine moves 35mm. 20/35 = 0.571439 Now multiply that by 100, and your steps/mm should be 57.1439.

It's a tad tight but the gearing is 1/1




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