Scale axis

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06 May 2022 14:54 #242145 by paulsao
Scale axis was created by paulsao
Greetings to all. Could someone help me calibrate my y-axis, I am performing detection and show that in a distance traveled of 10mm I have 1 tenth of an error of the real measurement, does anyone know a way to adjust it? Thank you.

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06 May 2022 14:59 - 06 May 2022 15:00 #242146 by snowgoer540
Replied by snowgoer540 on topic Scale axis

Greetings to all. Could someone help me calibrate my y-axis, I am performing detection and show that in a distance traveled of 10mm I have 1 tenth of an error of the real measurement, does anyone know a way to adjust it? Thank you.


Adjust it in the ini file, under SCALE for the axis. You have to restart between each edit of the INI file for it to take effect.

Formula is: (distance commanded / distance moved) * old step scale = new step scale

forum.linuxcnc.org/plasma-laser/45302-th...able?start=10#237678
Last edit: 06 May 2022 15:00 by snowgoer540.
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06 May 2022 19:04 #242161 by tommylight
Replied by tommylight on topic Scale axis
You can use the "calibration" from the machine menu or on the right side on one of the QtPlasmaC tabs, there should be scale also. No need to restart LinuxCNC.
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06 May 2022 19:07 #242162 by snowgoer540
Replied by snowgoer540 on topic Scale axis

You can use the "calibration" from the machine menu or on the right side on one of the QtPlasmaC tabs, there should be scale also. No need to restart LinuxCNC.


I always forget that's there :blush:, thanks Tommy
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08 May 2022 03:06 #242286 by paulsao
Replied by paulsao on topic Scale axis
Greetings. Thank you for your great help, I made the necessary calibrations and tried a commanded distance of 100mm and it's fine, the machine travels as indicated, with 500mm it's also fine, but when a command distance of 1000mm it obtained 1002mm, a difference of 2mm error, I don't know what is the problem if there are distances less than that is fine. Thank you.

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09 May 2022 23:40 #242428 by andypugh
Replied by andypugh on topic Scale axis
What are you measuring with?

What sort of axis actuators do you have?
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10 May 2022 00:04 - 10 May 2022 02:58 #242435 by paulsao
Replied by paulsao on topic Scale axis
Thanks for your answer.I am using nema 24 stepper motors without encoder.I am measuring with a tape measure. I don't know if it is better to calibrate the scale with small distances such as 10mm or with large distances such as 1000mm.
Last edit: 10 May 2022 02:58 by paulsao.

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10 May 2022 07:57 #242470 by tommylight
Replied by tommylight on topic Scale axis
Maximum distance the machine can move, that is used for scaling.
Or calculate the motor steps per turn, reduction, and the distance traveled for the pinion or belt pulley.
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10 May 2022 12:22 #242483 by paulsao
Replied by paulsao on topic Scale axis
Thank you.I do have the calculation of the pulleys and pinions, but I have a question, when the axis is squared by moving the limit switches, does that calculated scale change or does it not affect that at all? 

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10 May 2022 13:13 #242487 by paulsao
Replied by paulsao on topic Scale axis
And I also don't know why in one part of the table I have a different value of distance to another part of the table.

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