Limit switchs
02 Jan 2020 01:40 #153762
by PCW
Replied by PCW on topic Limit switchs
Right, so following errors are pretty much expected at this point
The basic scheme of setting up and tuning analog velocity mode servos is
documented here:
gnipsel.com/linuxcnc/tuning/servo.html
The basic scheme of setting up and tuning analog velocity mode servos is
documented here:
gnipsel.com/linuxcnc/tuning/servo.html
The following user(s) said Thank You: jeffie-3
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02 Jan 2020 03:47 - 02 Jan 2020 18:52 #153768
by jeffie-3
Replied by jeffie-3 on topic Limit switchs
When moving the axes 0.100 it says on the screen 0.0834 What is a way to get that to match before I tune the servos?
Last edit: 02 Jan 2020 18:52 by jeffie-3.
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05 Jan 2020 00:20 #154053
by jeffie-3
Replied by jeffie-3 on topic Limit switchs
The servo tuning instructions say to get the encoders scaled correctly in order to proceed with tuning the servos. How do I do that?
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05 Jan 2020 01:04 #154056
by PCW
Replied by PCW on topic Limit switchs
You set the per axis ENCODER_SCALE parameters in the INI file to encoder counts per machine unit (machine units being inches or mm)
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05 Jan 2020 01:46 #154061
by jeffie-3
Replied by jeffie-3 on topic Limit switchs
When I ran the PnCConf I put in all of that. But when I move the table the numbers are wrong. I went back and double checked the encoder, the two gears and the ballscrew. Does the problem lie in tuning the servos? Or does the movement numbers have to correct before I tune the servos?
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05 Jan 2020 01:51 #154062
by tommylight
Replied by tommylight on topic Limit switchs
It has to be correct before tuning.
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05 Jan 2020 01:58 #154064
by jeffie-3
Replied by jeffie-3 on topic Limit switchs
How do I correct it?
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05 Jan 2020 02:06 #154067
by PCW
Did you command a move of 0.100" and got an actual move of 0.0834" ?
this would be expected without tuning
Normally you would check the encoder scaling and direction with the drives disabled
by using an indicator
Replied by PCW on topic Limit switchs
When moving the axes 0.100 it says on the screen 0.0834 What is a way to get that to match before I tune the servos?
Did you command a move of 0.100" and got an actual move of 0.0834" ?
this would be expected without tuning
Normally you would check the encoder scaling and direction with the drives disabled
by using an indicator
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05 Jan 2020 02:24 #154069
by jeffie-3
Replied by jeffie-3 on topic Limit switchs
How do I disable the drive? When moving the table by hand using an indicator. I move 0.100 and get 0.375 on the dro. When I use command to move the table 0.100 the dro says 0.0834 and the indicator says 0.007 of movement.
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05 Jan 2020 02:37 #154070
by PCW
Replied by PCW on topic Limit switchs
The drives should be disabled when in estop
(but the DRO should still work)
(but the DRO should still work)
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