CNC Sewing machine question

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13 Jan 2020 07:52 #154741 by ahmetbm
Replied by ahmetbm on topic CNC Sewing machine question
When thread is broken, the operator will replace it, but how can we resume to sewing? We should go back a few steps, i can not figure out how to go back while the needle is designed as an axis?

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13 Jan 2020 10:13 #154746 by andypugh
Have you seen this:

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13 Jan 2020 10:23 #154749 by rodw
Replied by rodw on topic CNC Sewing machine question
For the record, this feature is now part of V 2.9 thanks to PhillC
The following user(s) said Thank You: Shu

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13 Jan 2020 10:32 - 13 Jan 2020 13:49 #154750 by ahmetbm
Replied by ahmetbm on topic CNC Sewing machine question
I have seen this video but when going back the needle motor rotates backward which i do not want it to happen.
Should we change needle to spindle mode or is there any way to make zero needle position without rotation?
Last edit: 13 Jan 2020 13:49 by ahmetbm.

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15 Jan 2020 00:23 #154864 by andypugh
You are asking questions that only you can answer. It all depends on how the machine is configured and controlled. Does it even exist yet?

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15 Jan 2020 06:35 #154892 by ahmetbm
Replied by ahmetbm on topic CNC Sewing machine question
Ofcourse. I am building a prototype, i am able to sew and cut fabric with co2 laser, but i have faced a problem that i did not think on at the begining. I designed the needle as an axis which made it easy to manage the sewing steps. However when it comes to moving backward or forward, it rotates the needle. So i am confused to change back the needle to spindle.

Since i am new on linuxcnc, your advices are welcome.


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15 Jan 2020 10:05 #154903 by andypugh
In the case where the thread is broken, does it matter if the needle axis moves?

The other option would be for the thread-break detection to report the G-code line where the thread broke (this is fairly easy if it also monitors motion.program-line)
You could then possibly use the run-from-line feature.

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15 Jan 2020 13:04 #154915 by ahmetbm
Replied by ahmetbm on topic CNC Sewing machine question

andypugh wrote: In the case where the thread is broken, does it matter if the needle axis moves?

The other option would be for the thread-break detection to report the G-code line where the thread broke (this is fairly easy if it also monitors motion.program-line)
You could then possibly use the run-from-line feature.


I re-checked but unfortunately, i can not move backward needle axis. I must find a way to move back all axes without rotating needle motors. This is the point where i stuck.
I will use a thread sensor to detect the break. I can pause machine when thread broke signal is arrived. However i can not figure out how to go back and use start from here?

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15 Jan 2020 13:25 #154916 by andypugh
restart could, in theory, be handled by your GUI.
If it knows where the break happened, c.auto(linuxcnc.AUTO_RUN, line-number)

linuxcnc.org/docs/2.8/html/config/python..._linuxcnc_command_tt

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15 Jan 2020 13:27 #154917 by andypugh
(I would anticipate the machine remembering exactly where the break happened, and moving the workpiece to there before restarting.)

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