Best Stainless Steel Cut at 800 mm / min ?
03 May 2024 13:46 #299630
by tommylight
Replied by tommylight on topic Best Stainless Steel Cut at 800 mm / min ?
What nozzle size?
what pressure?
what torch?
Why THC off?
-
Unless you have a really flat bed and heat treated metal plates, you must have THC on or the cut quality will vary a lot or be useless.
With normal nozzles, +-0.5mm is the difference between a good and a very bad cut, fine cut ones maybe +-1mm.
And, as a general rule when cutting stainless, more speed and more power = less charring , up to a certain point.
All this is generalized, there are to many variables to account for, so nothing can replace testing, lots and lots of testing and varying just one of the variables at a time.
I make a 100x10mm rectangle and do about 50 to 70 cuts of the same thing while changing gradually THC voltage, air pressure, feed rate, all for the same cut current. Repeat all this for every material, but i limit the current settings to 40-45 and 60A as that is what i have now.
Did all that last two days since i got a new plasma source, cheap china one. Found out it cuts best with 4bar at 45A i had it set at 5.5bar initially!
Pressure must be measured and set ONLY while the air is ON.
what pressure?
what torch?
Why THC off?
-
Unless you have a really flat bed and heat treated metal plates, you must have THC on or the cut quality will vary a lot or be useless.
With normal nozzles, +-0.5mm is the difference between a good and a very bad cut, fine cut ones maybe +-1mm.
And, as a general rule when cutting stainless, more speed and more power = less charring , up to a certain point.
All this is generalized, there are to many variables to account for, so nothing can replace testing, lots and lots of testing and varying just one of the variables at a time.
I make a 100x10mm rectangle and do about 50 to 70 cuts of the same thing while changing gradually THC voltage, air pressure, feed rate, all for the same cut current. Repeat all this for every material, but i limit the current settings to 40-45 and 60A as that is what i have now.
Did all that last two days since i got a new plasma source, cheap china one. Found out it cuts best with 4bar at 45A i had it set at 5.5bar initially!
Pressure must be measured and set ONLY while the air is ON.
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03 May 2024 14:29 #299635
by tommylight
Replied by tommylight on topic Best Stainless Steel Cut at 800 mm / min ?
Are you in the business of selling car tires? That is the only thing in use that has metric and imperial measures for the same thing, so you have everything in metric except pressure
Mine says pressure =5kg
no cm2 behind it so that is 5bar, but after testing 4 proved much better at 45A.
30mm square is no good for testing cut parameters, 100-150mm should be minimum. 30mm is not enough to get to cut speed if acceleration is low-ish.
That is the only thing in use that has metric and imperial measures for the same thing, so you have everything in metric except pressure Mine says pressure =5kg
no cm2 behind it so that is 5bar, but after testing 4 proved much better at 45A.
30mm square is no good for testing cut parameters, 100-150mm should be minimum. 30mm is not enough to get to cut speed if acceleration is low-ish.
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