- Thread starter HughF
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Chris Stevens
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They are very nice old machines, and I tend to use mine much more than Kemppi MLS. Pulse on start feature is a bit strange at first though, but guess it does have a purpose (but I dont have a clue as to what it might be!).
HughF
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Nope, straight argon. These GP2's always start with a pulsed HF on AC, Chris's is the same. They start super crisp on DC though. Also doesn't help that I had an unknown 1/8th tungsten which didn't have the best grind on it.
Richard.
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Strange. Mine just strikes up on the money. That flicker on the start would do my nut.
The pulse on section that thick is un needed I think.
I can see that the mix would be handy giving you that dc punch for penetration. Sounds a very silky smooth wave mind. Shame you don't have filter camera lenses. Would be lovely to see its stability although my highly trained ears could tell that is a very stable arc.
The pulse on section that thick is un needed I think.
I can see that the mix would be handy giving you that dc punch for penetration. Sounds a very silky smooth wave mind. Shame you don't have filter camera lenses. Would be lovely to see its stability although my highly trained ears could tell that is a very stable arc.
HughF
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That is just the way the GP2's are setup, I think it could be to do with minimising HF interference when these are interfaced to robotic cells (which a lot of them end up on, they have a robot interface terminal block inside them). I didn't have this set on pulse, the noise change is due to the mixed tig switching between DCEN and AC.
I will get a lens taped over the front of the camera and try my best to get some arc shots. I'm using Mobius action cameras which are tiny (pack of tictac's size) so might even be able to mount one onto my wrist/arm/hand/finger etc...
I will get a lens taped over the front of the camera and try my best to get some arc shots. I'm using Mobius action cameras which are tiny (pack of tictac's size) so might even be able to mount one onto my wrist/arm/hand/finger etc...
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Chris Stevens
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Had to send pedal back to Cowlins as they had fitted wrong value pot to foot-pedal, and also a wiring problem. Yours looks like its had a lot less of a hard life than mine though, so its probably going to work a bit better. Seen the GP4 SMP are advertising on Ebay? Looks like very little use at all, but not sure they are going to get £2k for it?
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Chris Stevens
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Mixed does seem to speed things up on thicker material, and so much easier to set machine to that mode than on my Kemppi.
HughF
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It would easily do 10mm from cold, a lot more with preheat. I never maxed out the pedal on that job. Had the old man watching the ammeter on the front of the machine and apparently we were around 250-275 most of the time and that felt about right. I quite often do aluminium engine mounts/bellhousings/thick stuff so when I was looking to replace the R-Tech I decided it was a 300A machine I wanted. Buy first, worry about powering it later - which is pretty much what happened.
The best way I can describe the GP2 is like a better, lighter, more compact, more efficient syncrowave 300.
The RPC does a superb job, but an inverter is actually a really easy load compared with motors.
The best way I can describe the GP2 is like a better, lighter, more compact, more efficient syncrowave 300.
The RPC does a superb job, but an inverter is actually a really easy load compared with motors.
HughF
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The pot in my pedal died the other day, it developed a duff spot at about 1/3 travel. I managed to find a suitable replacement in Farnell and was back up and running a day later. They are 5k 2w linear if you ever need to do it again. Needs a 2" shaft though.
I have seen the GP4, personally I don't see the attraction. Apparently they have frequency adjustment (but I can't see where on the front panel) but they are 25% larger than the GP2 and don't have the current control on a pendant which is a nice benefit of the GP2.
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Chris Stevens
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Part number of pot you used would be useful. Is yours a Linemaster pedal? Emailed SSC about pedal for MLS yesterday, and seems very reasonable at $276
Richard.
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It certainly doesn't sound anything like the syncrowave to me but that's not to say it doesn't weld like one. I'm also listening to it through the phone. Perhaps they sound more identical in the flesh.
Frequency adjustment is a nice thing to have but more often than not its needed to make unstable characteristics of inferior units bearable when narrowing the arc. A unit like that doesn't have it because it isn't essential and a focused arc can be generated on tungsten prep and accurate balling with the balance alone.
Frequency adjustment is a nice thing to have but more often than not its needed to make unstable characteristics of inferior units bearable when narrowing the arc. A unit like that doesn't have it because it isn't essential and a focused arc can be generated on tungsten prep and accurate balling with the balance alone.
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Chris Stevens
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They weld very much like a Syncro, but in mixed setting dont sound much like one. I would guess Hitachi probably designed the machines with Miller performance in mind, but with extra features, and far smaller and lighter?
