Pipe Cutting Plasma CNC

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13 Nov 2024 14:12 #314375 by Aldenflorio
I’m going to build a pipe cutting plasma. To spin the pipe it will be in a lathe chuck. What kind of motor should I use to spin the lathe chuck? The pipe will be very well supported as well as the chuck. So it won’t be too heavy on the chuck itself.

I'm concerned that a stepped motor might not provide enough strength, but I need something I can control precisely.

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13 Nov 2024 14:17 #314376 by tommylight
Replied by tommylight on topic Pipe Cutting Plasma CNC
What length pipe?
What diameter pipe?
Moving torch or moving pipe?

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13 Nov 2024 14:21 #314377 by Aldenflorio
Replied by Aldenflorio on topic Pipe Cutting Plasma CNC
Pipe:
-up to 4 feet but generally no longer than 1 foot
-up to 10” possibly
-2 roller supports bearing the weight of the pipe

The torch will move on the Y axis and the Z axis. The pipe will rotate on the X axis

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13 Nov 2024 14:40 #314378 by snowgoer540
Replied by snowgoer540 on topic Pipe Cutting Plasma CNC
You should be aware that Linuxcnc is limited to 3 axis look ahead. I’m not sure what that looks like for you, sounds like maybe you’re going to lock out the X axis or the design has it centered over the chuck permanently. But if you’re planning to have XYZA, then know that motion may be jerky (running similar to 3+1), and will not be coordinated with the smooth transitions you’re probably used to seeing out of a 4/5 axis plasma cutter. This will probably be problematic for cut quality.

Of course do your own simulation/testing but wanted you to be aware of the limitations software side.

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13 Nov 2024 14:55 #314383 by Aldenflorio
Replied by Aldenflorio on topic Pipe Cutting Plasma CNC
Sorry I may have explained it weirdly. It will only be a 3 axis machine. X is the pipe rolling, y is the fixed are torch holder moving, and z is the torch probing.

the torch will be fastened to fixed arm centered on the pipe. The arm itself will move the fixed torch on the y axis with a stepper motor.

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13 Nov 2024 17:39 #314390 by tommylight
Replied by tommylight on topic Pipe Cutting Plasma CNC

Like this?
Also 3 axis only, X is rotating, made several configs for each pipe diameter/perimeter as there is no need for more than one revolition ever.
This made a huge border crossing "tent"? "Palapa"? Whatever that is called, it is all round pipes with 73 and 193mm diameters.

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13 Nov 2024 17:57 #314393 by Aldenflorio
Replied by Aldenflorio on topic Pipe Cutting Plasma CNC
Yes exactly like that! I tried looking for more information about that build specifically but couldn’t seem to find the right keyword to pull it up.

I would love more information on the design of that, the motor used, the way Linuxcnc is best incorporate to fit that, and all.

i don’t think I realized that was your video, is it?
The following user(s) said Thank You: tommylight

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13 Nov 2024 20:00 #314400 by tommylight
Replied by tommylight on topic Pipe Cutting Plasma CNC
Yes it is mine, it is the old one with my full name as channel name. Plenty of stuff there also, wanted to transfer videos to new channels but there is no easy way.
My other channels just in case:
www.youtube.com/@toma.cnc1/videos
www.youtube.com/@toma.3d/videos
www.youtube.com/@tomapc/videos

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14 Nov 2024 12:19 #314438 by Aldenflorio
Replied by Aldenflorio on topic Pipe Cutting Plasma CNC
I subscribed to them all!

I couldn’t find any video explaining the pipe cuter though. What kind of motor did you use and how did you set it up?
The following user(s) said Thank You: tommylight

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14 Nov 2024 14:31 #314450 by tommylight
Replied by tommylight on topic Pipe Cutting Plasma CNC
The motor for rotating axis?
It had a long Nema 23 with 1:15 reduction, but had an accident while being transported from the old shop to the new shop and broke the reduction, so i changed it to chain reduction of 1:7 and Nema 34 motor. Also had to reduce acceleration a bit as it was cutting 193mm diameter tube with 4mm wall and 3 meter length.
Use very low inductance motor for this as they can spin faster, you might need it for smaller diameters.

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