Rotary cutting square tube with PlasmaC?
10 Jan 2021 10:10 #194700
by Clive S
2000 mm/sec do you mean 2000 mm/min
I saw that post about a month ago when Tom said something about cutting square tube.
Do you think Les was talking about a 4th axes in terms of one rotating the torch as it rounds the corner?
Replied by Clive S on topic Rotary cutting square tube with PlasmaC?
here is a recent post from Les at sheetcam on rotary + square tube (4 axis recommended, you can normally get away with 3 with a rotary axis as you can repurpose one of the axis to drive the rotary motion device stepper)
forum.sheetcam.com/viewtopic.php?f=2&t=8458#p28054
THC is best left off and run blind (no height control) with the z being controlled by gcode.
just something to consider, best ask Les if you have any questions about it / his thoughts on the subject
It would be worth testing to see if the Plasmac THC can lift the torch fast enough to follow the surface. If you have a good Z axis, I think it would be able to do it without crashing. say you are cutting at 2000 mm/sec, my rough calcs says your Z would need to accelerate at 1000 mm/sec/sec to follow it. But I'm a horrible mathematician!
2000 mm/sec do you mean 2000 mm/min
I saw that post about a month ago when Tom said something about cutting square tube.
Do you think Les was talking about a 4th axes in terms of one rotating the torch as it rounds the corner?
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10 Jan 2021 14:16 #194730
by tommylight
Replied by tommylight on topic Rotary cutting square tube with PlasmaC?
Some years back had a mock up as a proof of concept, it is doable and frankly mechanics are easier than the CAD/CAM part, but i just wing it in gcode as it is much easier for me to calculate a 1000 things in my head.
The main point of failure for this type of plasma cutting/bevelling is the simple fact that when cutting a 10mm thick plate at 90 degree it has to go through 10mm of metal, but at 45 degrees it has to go through 14.1mm. That goes higher exponentially with angle.
Hence the failure rate is huge as that makes the use of high pressure/high flow rate/high current a must.
Also getting the moving parts to cut in the same spot is easy, if it wasn't for the THC that keeps moving that spot .....
It is doable, i do not care about the complications, i will build two of them, i hope they fail, i still would not care, they will work perfectly for round tube!
The main point of failure for this type of plasma cutting/bevelling is the simple fact that when cutting a 10mm thick plate at 90 degree it has to go through 10mm of metal, but at 45 degrees it has to go through 14.1mm. That goes higher exponentially with angle.
Hence the failure rate is huge as that makes the use of high pressure/high flow rate/high current a must.
Also getting the moving parts to cut in the same spot is easy, if it wasn't for the THC that keeps moving that spot .....
It is doable, i do not care about the complications, i will build two of them, i hope they fail, i still would not care, they will work perfectly for round tube!
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