Cuts are not as designed
- tommylight
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25 Sep 2020 14:50 #183727
by tommylight
Replied by tommylight on topic Cuts are not as designed
If it is loose, tighten it.
Also check the play between pinion and gear rack.
Also check the play between pinion and gear rack.
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- Aldenflorio
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25 Sep 2020 14:52 #183729
by Aldenflorio
Replied by Aldenflorio on topic Cuts are not as designed
Ok. Once I figure it out is that something that the linuxcnc can fix or is that a hardware fix?
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25 Sep 2020 14:53 #183730
by tommylight
Replied by tommylight on topic Cuts are not as designed
Hardware.
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25 Sep 2020 14:58 #183733
by Aldenflorio
Replied by Aldenflorio on topic Cuts are not as designed
Ok. Thank you
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26 Sep 2020 14:11 #183847
by Aldenflorio
Replied by Aldenflorio on topic Cuts are not as designed
Fixed. It was as you said
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26 Sep 2020 22:06 #183892
by thefabricator03
Tom, Just curious, when does direct drive with steppers become unworkable? As in when do you need a reduction stage?
Replied by thefabricator03 on topic Cuts are not as designed
Fixed. It was as you said
Tom, Just curious, when does direct drive with steppers become unworkable? As in when do you need a reduction stage?
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26 Sep 2020 22:41 - 26 Sep 2020 22:41 #183895
by Aldenflorio
Replied by Aldenflorio on topic Cuts are not as designed
I second this question. I have also follow up questions: what is a reduction stage and what does this person mean when they say “unworkable”?
Last edit: 26 Sep 2020 22:41 by Aldenflorio.
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26 Sep 2020 22:50 - 26 Sep 2020 22:55 #183897
by thefabricator03
Replied by thefabricator03 on topic Cuts are not as designed
When I said unworkable I mean, as Tom posted in another thread that direct drive with a pinion gear will end up with around 100mm of travel per one revolution of the stepper motor which is too course.
I guess that comes down to pinion size and rack size but there must be a grey area where it works.
Also a reduction stage is where the stepper motor output is multipled by a gear ratio to give a increase in torque and decrease in travel per revolution. I have a 10:1 gearbox on my stepper motors so for one rotation of the stepper the pinion will move 1/10th of that.
I guess that comes down to pinion size and rack size but there must be a grey area where it works.
Also a reduction stage is where the stepper motor output is multipled by a gear ratio to give a increase in torque and decrease in travel per revolution. I have a 10:1 gearbox on my stepper motors so for one rotation of the stepper the pinion will move 1/10th of that.
Last edit: 26 Sep 2020 22:55 by thefabricator03.
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26 Sep 2020 23:41 #183901
by Aldenflorio
Replied by Aldenflorio on topic Cuts are not as designed
Interesting. I don’t have a gear reduction box on my motors at all and I don’t seem to have a problem. I’m not using pinion gears though. Would the point of a gear reduction be for accuracy or so the motors don’t go too fast?
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26 Sep 2020 23:47 #183902
by thefabricator03
Replied by thefabricator03 on topic Cuts are not as designed
What are the specs of your motors?
With the gearbox, usually they are used for servos since servo motors have a specific RPM the work at best. The reduction box reduces the speed of the servo to something usable and they can also be used to increase the torque of the motor.
With the gearbox, usually they are used for servos since servo motors have a specific RPM the work at best. The reduction box reduces the speed of the servo to something usable and they can also be used to increase the torque of the motor.
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