CNC Plasma Table Project/upgrades

[Hood]

It was 2.6kw and price in US $ as below

 

[sako243]

would you reccomend any plug and play nema 34 servos and drives that take step and dir?

I'll dig out the link I used for the guillotine backgauge. That was a Chinese servo and driver from Aliexpress for under £300. It took step and dir inputs albeit I used them differentially for robustness.

 

[sako243]

Was this setup I think, at least that driver

HLTNC 1.8KW 220V AC 3000Rpm 6Nm Nema42 Servo Motor Kit 110ST M06030 With Hybrid Servo Drive T3DF L30F For CNC Engraver Router - AliExpress 1420

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

 

[Erie Fred]

Ah that is a bit better
Biggest drawback to steppers is slow acceleration, if you have 90 degree corners you will get rounding unless you slow things down, complex shapes likewise.

Your supposed to slow down the corners for the plasma no ?

 

[Hood]

Your supposed to slow down the corners for the plasma no ?

If your plasma can't keep up, I don't bother, no need.

 

[Erie Fred]

If your plasma can't keep up, I don't bother, no need.

What do you mean ?
You would rather a laser ?
IIRC OP doesn't have a laser.

 

[Munkul]

He means he has enough acceleration on his table with his expensive servos, and a powerful enough plasma unit, that he doesn't need to slow down for corners.
The rest of us all have slow stepper motors and probably plasma arcs that trail too much to make sharp corners.
The quality that Hood gets off his table rivals laser, at least it rivals the laser we have at work

 

[Hood]

Yes, as @Munkul says the acceleration of my axes are good enough that I get no corner rounding, at least on the stuff I do and the speeds I cut.

 

[Hood]

...
The quality that Hood gets off his table rivals laser, at least it rivals the laser we have at work

I am impressed with the quality I get from the Jasic, wouldn't say it is near laser quality but it is good.

 

[Erie Fred]

...and yet I get along just fine with that same controller and steppers....

How thick of material are you zipping around on ?

 

[Hood]

...and yet I get along just fine with that same controller and steppers....

How thick of material are you zipping around on ?

My normal is 4-20mm alu, 3-16mm stainless and steel 3-30mm

 

[Erie Fred]

My normal is 4-20mm alu, 3-16mm stainless and steel 3-30mm

30 mm what plasma supply ?

 

[Munkul]

I am impressed with the quality I get from the Jasic, wouldn't say it is near laser quality but it is good.

On thinner stuff the laser shines, but on 12mm upwards, our laser makes any sort of job between ok and awful. 20mm in particular is terrible, always has been.
You don’t get the tapered kerf with laser, but sometimes the striations are random and so deep that it might as well be taper. Plus, sometimes you get tapered holes anyways, if you go too small with diameter/thickness ratio.

Oxygen laser is very finnicky, it's a balancing act between oxygen pressure, nozzle size, power level and focal height.
You’re talking 0.1bar making a huge difference in cut quality. Meaning day to day, sometimes the cut quality varies. Even plate to plate it varies.
Nitrogen cutting is far easier to get right.

Interestingly enough, was talking to a steel sales guy about our problem, he often quotes for profiles and subs it out to suppliers, he said he always goes HD plasma for 20mm instead of laser as no-one around here can give as good an edge quality on laser.

If anyone can do it. it would be a company I use sometimes, who have 2 almost new Trumpf machines... but they're probably £1m+ machines each....!

 

[Hood]

30 mm what plasma supply ?

Jasic 80Amp, been looking for pics but can't find any, only one I can find is the one below and it is either 20mm or 25mm.

 

[Hood]

Just looked back at the 3D model and it was 20mm.
Cut at 80Amps (I always do) and 400mm/min

 

[Hood]

....
You don’t get the tapered kerf with laser, but sometimes the striations are random and so deep that it might as well be taper. Plus, sometimes you get tapered holes anyways, if you go too small with diameter/thickness ratio.
....

This was showing that there was minimal bevel on the above 20mm part.

And even on the scrap side it was minimal.

 

[Erie Fred]

and no corner slow down ?
Your part has an interior cut out with what looks like 4 corners, but you designed the part with some larger
radius so to preclude corner slow down.
Which I do as well, however Hypertherm shows corner slow down for more accuracy.

also there is a big difference from 20 to 30mm when it comes to plasma.

 

[Munkul]

This was showing that there was minimal bevel on the above 20mm part.

View attachment 465690

And even on the scrap side it was minimal.

View attachment 465691

You're somehow getting HD plasma quality on that 20mm that's good enough to meet any thermal cutting spec. Its a million miles better than our laser.

 

[Hood]

and no corner slow down ?
Your part has an interior cut out with what looks like 4 corners, but you designed the part with some larger
radius so to preclude corner slow down.
Which I do as well, however Hypertherm shows corner slow down for more accuracy.

also there is a big difference from 20 to 30mm when it comes to plasma.

Yes, 50% more Also a lot slower, 80mm/min and edge start, max pierce I do is 20mm although I have done 25mm

 

[Hood]

You're somehow getting HD plasma quality on that 20mm that's good enough to meet any thermal cutting spec. Its a million miles better than our laser.

The Jasic is impressive.