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Discussion in 'Laser Cutters' started by Metalguru, Mar 31, 2017.
A Benchtop Plasma Cutter Concept
Metalguru published a new build:
Read more about this build...
I am in the process of building a plasma cutter and I really like your concept. If you don't mind sharing your files that would be awesome!
I'll try to get them up. I've had problems with putting up large Sketchup files on this list before, I'll see how it goes.
Seems to have worked OK. Note that this is a SketchUp 2017 file, it will require 2017 to open it. Also note that there are a lot of small parts and details missing, it's just a concept. Let me know if you find any errors.
Really nice project , i was thinking to build somethink like this to complet my CNC plasma cutting table for smaller cuts .
I will start this project next week and let you now the progress of the project .
Nice idea @Metalguru this is going to be really cool to see in action.
Yeah, post the build on the builds page so we can see how it turns out!
Construction has begun ... if i have some time in the afternoon i will post some pictures .
I was thinking of putting a floating head for the torch support, but I will instead use an inductive sensor. (
to reduce the weight at the end of the arm )
Aluminium plates were cut with my other plasma cutting table .
Cutting aluminium with plasma work fine but the results are not as good as with steel .
To be continued ...
I like those custom side plates. Going to be a bit difficult to adjust your eccentrics, no?
Can't wait to see it in action...
Adjust the eccentrics is not a problem because the 2 custom plates are mount after the adjustement of the 2 carriers of the Y axis .
But if something go wrong or move , effectively , you will have to remove the 2 custom plates to re-adjust the eccentrics .
I just started a new post on the builds page .
Dragon too Plasma cutter Mods (MetalGuru idea)
Put a cutter at each end and you can cut two identical parts at once. It would help balance it, too.
Picture of the floating head at the end of the arm :
Why do you need 2 sets of carriages for the torch? Isn't that a lot of extra weight?
I use this kind of assembly to detect the sheet of steel and set the "Zero" of my Z axis .
You can see a full assembled floating head on this picture ( this is my other cutting table )
When the torch is on the sheet of steel , the second carriage move up to the endstop .
An offset is set in Mach3 , this is how i set to 0 my z axis .
The extra weight is not really big .
Another way to do this could be using an omic torch sensor on the torch itself ( i will explore this solution .. )
Ah, I see. Seems a bit complicated, you could just use an inductive proximity sensor or even just a microswitch to detect the material to be cut...
To keep a precise "zeroing" of the Z axis , the touching point must be as close as possible of the torch .
On my last try with an inductive sensor or with a simple endstop , the life expectancy of the sensor was very limited .
This is why i use this kind of solution .
Extra weight is around 200g .
The wiring is now finished (as expected , it was not really easy .. but it's done .. )
So, I'm not clear on how this works. It looks like there is a microswitch on your outside carriage, do you lower the inside carriage down until the torch contacts the work, and lifts the second floating carriage until the microswitch contacts? Then lift the inside carrage a fixed amount to set the torch height?
Why would the sensor life of an inductive sensor be limited? Does the electrical field from the torch affect it? Spatter? Wear and tear from contacting the table?
Some photos with the torch attached might be helpful. A video of it in action would be even better...
How do you wire the plasma cutter to the cnc. Meaning from my tinyg to the switch on my hypertherm 30. I have looked everywhere and can't seem to find any information.
Use the Spindle control output, and wire it to a 5v relay module. Wire the relay NO contacts across the contacts on your plasma cutter that normally go to the torch switch. Use M3 g-code to turn on, M5 to turn off.
Perfect thank you so much that's what I have been missing. I use fusion 360 so m3 and m5
G-code is built into the cutting mode so that's taken care of, but thanks again that was a big help.
What amp relay is needed?
Should just need a small relay, probably way less than 1A. You could measure the current on your normal torch switch by just shorting a current meter across the connector pins and see how much current is drawn.
very nice project you have from this and detailed drawings and electronics assembly thank you