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Worm drive
30 Oct 2015 06:08 #64494
by bill516
Worm drive was created by bill516
I have a worm drive gear box that I am playing with as a possible 4th axis on my machine but the stepper config has me baffled. What do I need to enter for the pulley/gear settings and the leadscrew pitch in the step config
Pulled the drive apart and the worm is a 2 start thread with a 5mm pitch, the gear is 88 tooth. Physically rotated the drive shaft 44 times and got 1 rev of the output shaft
200 step stepper with 1/8th microstep (although that is adjustable)
Bill
Pulled the drive apart and the worm is a 2 start thread with a 5mm pitch, the gear is 88 tooth. Physically rotated the drive shaft 44 times and got 1 rev of the output shaft
200 step stepper with 1/8th microstep (although that is adjustable)
Bill
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30 Oct 2015 08:21 - 30 Oct 2015 08:21 #64495
by LearningLinuxCNC
Replied by LearningLinuxCNC on topic Worm drive
Bill,
You will need to set the gear ratio as 1 : 44 if the stepper motor is direct coupled to the worm gear input shaft.
Then put the value of leadscrew pitch to be 360 degrees per revolution.
I think I would go down to a microstep of 1/2 instead of 1/8.
You will need to set the gear ratio as 1 : 44 if the stepper motor is direct coupled to the worm gear input shaft.
Then put the value of leadscrew pitch to be 360 degrees per revolution.
I think I would go down to a microstep of 1/2 instead of 1/8.
Last edit: 30 Oct 2015 08:21 by LearningLinuxCNC.
The following user(s) said Thank You: bill516
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30 Oct 2015 17:21 #64508
by bill516
Replied by bill516 on topic Worm drive
Thanks Nitro, thinking about it its logical that the pitch is 360.
Bill
Bill
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30 Oct 2015 20:29 #64516
by andypugh
Stepconf tries to be too helpful, and asks questions that can not always be answered.
Perhaps here should be a box to directly enter the step scale.
The final result of the multiple boxes in Stepconf is a single number in the INI file, the number of step pulses per machine unit.
In your case 1 degree is 44 / 360 turns per degree
If you are at 1/8 microstep then that is 200 x 8 steps per turn.
The number of steps per degree is thus 200 x 8 x 44 / 360 = 195.5555556
And that should be the number that you see in the INI file.
This also shows that you have a resolution of 1/200th of a degree but that you need 1170 Hz for 1 rpm. You might find that you can't make steps fast enough to turn at the rate you want, and that reduced microstepping will be needed.
Replied by andypugh on topic Worm drive
What do I need to enter for the pulley/gear settings and the leadscrew pitch in the step config
Stepconf tries to be too helpful, and asks questions that can not always be answered.
Perhaps here should be a box to directly enter the step scale.
The final result of the multiple boxes in Stepconf is a single number in the INI file, the number of step pulses per machine unit.
In your case 1 degree is 44 / 360 turns per degree
If you are at 1/8 microstep then that is 200 x 8 steps per turn.
The number of steps per degree is thus 200 x 8 x 44 / 360 = 195.5555556
And that should be the number that you see in the INI file.
This also shows that you have a resolution of 1/200th of a degree but that you need 1170 Hz for 1 rpm. You might find that you can't make steps fast enough to turn at the rate you want, and that reduced microstepping will be needed.
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31 Oct 2015 03:10 #64529
by bill516
Replied by bill516 on topic Worm drive
Thanks Andy it was the pitch box that threw me.
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