Laser head with 10 laser diodes

Gus71
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17 May 2022 04:36 #243129 by Gus71

Laser head with 10 laser diodes was created by Gus71

Hi...
I need help:
-I have an axis driven by a stepper motor
-This axis has a head with 10 laser diodes that I want to turn on and off independently
-I have expanded the digital outputs and would like to switch them while the axis is moving
Grid mode:
- E.g:
- G90
- G0 x10 M64 (P1...P10) ; Laser ON
- G0 x20 M65 (P1...
P10) ; Laser OFF
- G0 x30

The problem is the axis stops at the M command!

Question:
1) How to solve the problem?
2) Is it even possible?

Thanks in advance...

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andypugh
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17 May 2022 10:27 #243136 by andypugh

Replied by andypugh on topic Laser head with 10 laser diodes

Try M62 / M63 instead.

(I don't guarantee that it will work, but it might)

Also try using G1 with a high feed rate rather than G0.

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Gus71
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17 May 2022 12:16 #243142 by Gus71

Replied by Gus71 on topic Laser head with 10 laser diodes

Thanks for the info, but I've already tried... unfortunately it doesn't work either...

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andypugh
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17 May 2022 12:29 #243146 by andypugh

Replied by andypugh on topic Laser head with 10 laser diodes

Which LinuxCNC version?

It might be worth experimenting with G61 / G64 etc:
linuxcnc.org/docs/stable/html/user/user-...#_trajectory_control

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Gus71
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17 May 2022 12:31 #243148 by Gus71

Replied by Gus71 on topic Laser head with 10 laser diodes

LinuxCNC2.8.2 / Debian10.10

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andypugh
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17 May 2022 12:51 #243151 by andypugh

Replied by andypugh on topic Laser head with 10 laser diodes

Gus71 wrote:
LinuxCNC2.8.2 / Debian10.10

You have the latest trajectory planner, then.

Have you checked the G64 / G61 settings?

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Gus71
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17 May 2022 13:29 #243156 by Gus71

Replied by Gus71 on topic Laser head with 10 laser diodes

That works: many many thanks

How did you know?

F1000

M62 P1 ; (laser ON)
G1X10
M63 P1 ; (laser off)
G1X20

..etc...
G30

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Gus71
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17 May 2022 13:38 #243160 by Gus71

Replied by Gus71 on topic Laser head with 10 laser diodes

how can I check the G64 / G61 settings?

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andypugh
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17 May 2022 14:16 #243162 by andypugh

Replied by andypugh on topic Laser head with 10 laser diodes

Gus71 wrote:
how can I check the G64 / G61 settings?

Most of the GUIs report it in a Status window. It's on the MDI tab in Axis, for example. (Active G-codes)

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Todd Zuercher
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17 May 2022 18:12 #243185 by Todd Zuercher

Replied by Todd Zuercher on topic Laser head with 10 laser diodes

It is best never to assume the status of important g-codes like G64. Best practice is to always explicitly set them at the beginning of every g-code file. (This is what is called having a good "Preamble" for your g-code.) Usually it is simple to set up your CAM software or post processor so that they will all ways be inserted at the start of each file. Then you never have to worry about them again.

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