Silly Question on A and B Axis and Steppers
28 Apr 2020 09:34 #165937
by Cutter07
Silly Question on A and B Axis and Steppers was created by Cutter07
Sorry newbie alert.
Is it possible to home a stepper in the A and B axis if you don't have a switch, or index similar to what you would in an X Y and Z axis?
I have the homing for the X Axis down fine, I just could not work out how to home the A and B Axis given I don't have a limit switch for them, or more to the point I can't.
Cheers
Is it possible to home a stepper in the A and B axis if you don't have a switch, or index similar to what you would in an X Y and Z axis?
I have the homing for the X Axis down fine, I just could not work out how to home the A and B Axis given I don't have a limit switch for them, or more to the point I can't.
Cheers
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28 Apr 2020 10:14 #165942
by tommylight
Replied by tommylight on topic Silly Question on A and B Axis and Steppers
It would help if you upload the hal and ini files.
At any rate, the same homing settings for A should be used for B, from your description.
At any rate, the same homing settings for A should be used for B, from your description.
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28 Apr 2020 10:32 #165945
by Cutter07
Replied by Cutter07 on topic Silly Question on A and B Axis and Steppers
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28 Apr 2020 10:36 #165947
by tommylight
Replied by tommylight on topic Silly Question on A and B Axis and Steppers
That all looks fine, and you have it set for immediate homing, so it will home at any position it is when you press home.
I am guessing the issue is that the B axis has to be at some specific angle, not just anywhere ?
I do not think that is possible without some kind of position feedback, so a switch must be used, or you can jog it to where it should be and home there, but that will not be precise.
I am guessing the issue is that the B axis has to be at some specific angle, not just anywhere ?
I do not think that is possible without some kind of position feedback, so a switch must be used, or you can jog it to where it should be and home there, but that will not be precise.
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30 Apr 2020 04:23 #166186
by Cutter07
Replied by Cutter07 on topic Silly Question on A and B Axis and Steppers
Yeah I was think that I may need a switch, but given that its being used for angular motion this is not possible. Its not the end of the world, I can jog it to the position I need it and re home the three axis.
This is a prototype machine I am making, with steppers just for cost purposes. When I change to servos motors this should not be an issue, is that write? Servo's (with and index or encoder) know where there are?
This is a prototype machine I am making, with steppers just for cost purposes. When I change to servos motors this should not be an issue, is that write? Servo's (with and index or encoder) know where there are?
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30 Apr 2020 07:03 #166192
by tommylight
And it should be possible to add a sensor or switch, there is always a moving and a stationary part of an axis, sensor on the stationary part.
And you probably can home an angular axis with servos, but only if they do have absolute encoders, for anything else you do need a sensor.
Replied by tommylight on topic Silly Question on A and B Axis and Steppers
No need to rehome 3 axis, you can unhome only the axis you need from the machine menu, unhome, choose axis to unhome.Yeah I was think that I may need a switch, but given that its being used for angular motion this is not possible. Its not the end of the world, I can jog it to the position I need it and re home the three axis.
This is a prototype machine I am making, with steppers just for cost purposes. When I change to servos motors this should not be an issue, is that write? Servo's (with and index or encoder) know where there are?
And it should be possible to add a sensor or switch, there is always a moving and a stationary part of an axis, sensor on the stationary part.
And you probably can home an angular axis with servos, but only if they do have absolute encoders, for anything else you do need a sensor.
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