Limit switchs

PCW
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6 years 9 months ago #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

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jeffie-3
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6 years 9 months ago #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?

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jeffie-3
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6 years 9 months ago #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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PCW
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6 years 9 months ago #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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jeffie-3
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6 years 9 months ago #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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tommylight
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6 years 9 months ago #154062 by tommylight

Replied by tommylight on topic Limit switchs

It has to be correct before tuning.

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jeffie-3
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6 years 9 months ago #154064 by jeffie-3

Replied by jeffie-3 on topic Limit switchs

How do I correct it?

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PCW
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6 years 9 months ago #154067 by PCW

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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jeffie-3
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6 years 9 months ago #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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PCW
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6 years 9 months ago #154070 by PCW

Replied by PCW on topic Limit switchs

The drives should be disabled when in estop
(but the DRO should still work)

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