Plasma Cutter & Plasma/AC-DC TIG/Stick (Inverter Design = Magic!)

[SmokinDodge]

Originally Posted by Shade Tree Welder

I can bring my 350P...

And hook a whole nother batch of freshmen with his blue machine voodoo.

It's transcending the first time you get to do pulsed spray.

Sent from my ipotato

[allessence]

Originally Posted by toprecycler

Hey, I wanted to try your 350P. Then I can see what I am missing at work. Oh wait, I probably would never talk the boss into one. I started using spray arc last year and he just asked/ told the other guy he is not sure it is worth it and we better do some tests to make sure it is as good as short circuit. :-) what do I do? The boss is always right, right?

Brian

Poke him in the eye and tell him to get out on the floor and see the difference..

do a couple of timed runs on the same part then do an acid etch test.. they really don't compare..

Spray arc is so much faster with less HAZ, better penetration, better finish..

I'll come and poke him in the eye for you..

Just so you guys know I have never poked someone in the eye because I don't like what they are saying. I just like to think about poking them in the eye while they are saying it..

[platypus20]

The Miller MM350P was probably one of the best buys, I ever made.

[MAC702]

Originally Posted by platypus20

The Miller MM350P was probably one of the best buys, I ever made.

And I'll bet Miller never tried to advertise it by telling you it was magic.

[platypus20]

Originally Posted by MAC702

And I'll bet Miller never tried to advertise it by telling you it was magic.

Bingo!

[midmosandblasting]

I wonder how the machine Pile Buck had has held up over the years ?

[DivTec]

Originally Posted by jimcolt

My responses are in red below! Jim Colt

Originally Posted by jimcolt

A large plasma chamber? Maybe you can explain? And trust me....your machine is rated (duty cycle) at 115 load volts, but you will not be cutting 3/4" steel at 115 volts....most likely with an unshielded torch your load voltage will be at least 130 to 135 volts. Your power supply will produce that voltage for a short period of time....until duty cycle is exceeded or failure occurs.

The pilot mode is simply lower power.....but the ability to switch from cutting power to pilot, then back to cutting very quickly without going through the blowback starting process. The level of electrical noise would likely be lower at pilot level. Using our technology a high frequency start torch (like the ones you use) could do the same thing.....without firing the high frequency.

I'd like to see a video of you cutting 3/4" steel....lets see the speed, then show a voltmeter showing the load voltage....the wattage would be similar to that of our 45 amp (Powermax45) plasma cutter.....which cuts 1" very well, but at about 145 load volts. Jim Colt Hypertherm

Here is a link to a youtube video of our Plasma-Tec50dv cutting 3/4 inch steel bottom plate for an excavator bucket we built in a day. It's quite a long continuous cut.

https://youtu.be/g8SBgvvz3HA

Viewing it should address your comment... "I'd like to see a video of you cutting 3/4" steel...."

This video does show the front of our 20 lb machine for a short time...
FYI: really the duty-cycle on our machines are virtually 100%... literally we have never had a thermal shutdown. I mean the MOSFET heat-sink is ambient temp. to the touch of a finger and stays that way.
It really comes down to MOSFET switching transition speed (the time it stays between on and off (heat generations zone)) and the Ron (Resistance of the MOSFET when switched on). This is another reason I've stayed with Power MOSFET's. But, I do need to check for tech. advancements of IGBT's as there are pro's & con's for both.

I suspect your Powerbax45 is producing around 700+ watts more at the cut than my Plasma-Tec50 since you state it will easily cut 1 inch... and my machine is slow at that thickness. It seams that higher cut load voltage is a benefit... but, I suspect there is a sweet-spot between output current and cut load voltage. Quite interesting.

I have measured voltage under load before and it's around 115 volts and does vary a bit. But, I can test it again.

Plasma chamber: I meant for example our PT31 torch has consumables with different sized plasma chamber in the tip... and the AG60 torch (being used in the video) has a much larger plasma chamber. None get very hot.

[jimcolt]

Originally Posted by DivTec

Here is a link to a youtube video of our Plasma-Tec50dv cutting 3/4 inch steel bottom plate for an excavator bucket we built in a day. It's quite a long continuous cut.

https://youtu.be/g8SBgvvz3HA

Viewing it should address your comment... "I'd like to see a video of you cutting 3/4" steel...." You left the part out about the load voltage when cutting 3/4" steel.......it will be much higher than 115 vdc.

This video does show the front of our 20 lb machine for a short time...
FYI: really the duty-cycle on our machines are virtually 100%...I know better than to believe your unit is 100% duty cycle when cutting 3/4" material. The readers on this forum know better as well. Can you share the design specs? ambient temperature (at rated duty cycle), amperage and load voltage (at duty cycle), etc? literally we have never had a thermal shutdown. I mean the MOSFET heat-sink is ambient temp. to the touch of a finger and stays that way. I won't argue with you....however MosFets are old technology that is used because they are low cost. They are prone to catastrophic failure under high voltage transient conditions.
It really comes down to MOSFET switching transition speed (the time it stays between on and off (heat generations zone)) and the Ron (Resistance of the MOSFET when switched on). This is another reason I've stayed with Power MOSFET's. But, I do need to check for tech. advancements of IGBT's as there are pro's & con's for both.

I suspect your Powerbax45 is producing around 700+ watts more at the cut than my Plasma-Tec50 since you state it will easily cut 1 inch... and my machine is slow at that thickness. It seams that higher cut load voltage is a benefit... but, I suspect there is a sweet-spot between output current and cut load voltage. Quite interesting.

I have measured voltage under load before and it's around 115 volts and does vary a bit. But, I can test it again.Plasma cutting load voltage is a function of nozzle orifice size and arc length. When you cut 14 gauge thickness....and have a small orifice diameter...then you could be at 115 load volts.....on 3/4" that is not possible, you should understand the process before talking about something that is not possible.

Plasma chamber: I meant for example our PT31 torch has consumables with different sized plasma chamber in the tip... and the AG60 torch (being used in the video) has a much larger plasma chamber. None get very hot.

This indicates that you do not understand the high temperature physics that occur inside a plasma torch. The size of the plenum (we do not call it a chamber) has nothing to do with the temperature of the arc...or the temperature of the torch consumables. You are using a copy of a 30 year old torch design.

[Scott V]

Originally Posted by MAC702

And I'll bet Miller never tried to advertise it by telling you it was magic.

Correct, and Lincoln did not with there more advanced pulse machine, in price range of the 350p (Rapid-arc,uphill pulse,pulse on pulse, etc..)

Mac,
it's too bad Jimmie did not have his hooked up for steel when you were out this way.. Pretty impressive..(upgrade available over the net too..) highly adaptive arc in pulse. First thing Kevin said when he used it beside his 350p..

[greywynd]

For that speed and quality of cut I'll stick to O/A.

As a multi-process machine, it looks like it does many things, but none of them really well. Which is why I'll stick to dedicated process machines.

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