15m Industrial Plasma Cutter

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29 Aug 2019 18:14 #143589 by andypugh
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29 Aug 2019 18:37 #143591 by islander261
$$ The Velox Z axis for plasma is nearly ready to go. Just add a NEMA 23 stepper some switches and a torch mount and you are ready to go.

www.veloxcncrouters.com/xz-za-series

John
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29 Aug 2019 19:04 #143592 by tommylight

I'm also wondering if I can throw together an extremely simplified version eg. no variable z axis height/magnetic breakaway or any of that. And just accept that the quality won't be fantastic, but at least it will get done.

That is a big no no, you will regret that during testing and tuning, before you make any usable cuts.
There are plenty of options, and you can build your own floating head in half a day, using drawer slides with ball bearings. Built plenty of them and they do work perfectly ( well untill some of that fine dust gets to those balls, then some major leaning is needed ) granted you turn their slots to the back side to prevent the above. Find a hydraulic repair shop, there must be one near you ( there are 2 in my town with 110000 people ), they have shafts at any diameter in 6 meter lengths, so get 1 meter of 14 or 16 or 20mm shaft at around 30 to 40 euro, should be enough for a Z axis plus floating part ( floating part needs about 1 cm of movement, just enough to trigget the floating switch or sensor ), find a shop for bearings as they must have linear bearings for round rails/shafts, get 8 of them at 5 to 7 euro a piece, and a switch, 4 aluminium plates at 10 to 15 by 4 to 6 cm with 3 holes on them, allthread or a 20 to 30 cm long M6 or M8 or M10 screw, and in a day you have a fully functional Z axis with probe.
That makes 2 options, both cheap and very quick with hand tools and a bit of persistance.
And just in case you think that drawer slides are to thin or to flimsy, get two of them and mount them at 90 degrees to each other, you will be amazed at how stiff that becomes.
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05 Sep 2019 09:50 #144226 by Jarman
Replied by Jarman on topic 15m Industrial Plasma Cutter
Hello everyone, just an update.

I'm in the process of building my z axis following a similar design to this:

www.veloxcncrouters.com/xz-za-series

My design will look a bit like this:



The idea is that the floating head is on the same set of rails as z travel, using a spring loaded system (the plate with floating head attached is only connected to the bottom 2 linear rails and can therefore slide over the top 2 rails and trigger a pnp switch).






I am now wondering about the x axis that the z axis sits on. If I want 1.25m of x axis travel how much extra space should I allow for sensors/switches etc. on either side? Do I need home/limit on both sides? And how much should the X axis overlap the Y axis on each side? Just the width of the linear rails it runs on or more?

Thanks.
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05 Sep 2019 10:31 #144228 by rodw
Replied by rodw on topic 15m Industrial Plasma Cutter
Every machine will be different depending on how you lay it out. My limit switches are within 2-3mm of the hard endstops.

A good length might be 1600mm rail with a 1400mm rack. On my Y axis, this gave me 1264mm of travel but my carriages are further apart there than on my X.
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05 Sep 2019 12:18 #144233 by andypugh
I have never even seen a plasma cutter, so take this idea as purely theoretical.

But I think this could make a good floating mount:
uk.rs-online.com/web/p/slide-unit-actuators/1244615/
The idea being that after the probe the air pressure can be increased to lock the head down to avoid false-tripping by vibration.
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05 Sep 2019 12:52 #144234 by pl7i92
Replied by pl7i92 on topic 15m Industrial Plasma Cutter
we use a SBR free float system to get Touch off and safe
i added the FC file


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05 Sep 2019 13:07 #144236 by andypugh
There are definitely cheaper ways than the pneumatic cylinder. I only really proposed that as an off-the-shelf unit to save time.
The cylinders also have provision for mounting solid state switches in a range of styles and types: uk.rs-online.com/web/c/?sra=oss&r=t&searchTerm=D-M9
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06 Sep 2019 07:38 #144335 by Jarman
Replied by Jarman on topic 15m Industrial Plasma Cutter
Ok, I am thinking of using a Nema 23 for my z axis, as used in this design.

www.veloxcncrouters.com/xz-za-series

Does LinuxCNC and 7i67E interface well with hybrid steppers? Do you guys using steppers have rotary encoders?

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06 Sep 2019 07:43 #144337 by rodw
Replied by rodw on topic 15m Industrial Plasma Cutter
Yes. I think normally, the closed loop steppers are closed on the stepper driver so Mesa and Linuxcnc don't care. Wait for others to respond because I think feedback can be closed in Linuxcnc but it may not be worth the complexity.

Nema 23 is fine. I use 269 Oz/in Nema23 on mine
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