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Thread: Tig pedal for a poor man
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23rd Dec 2019, 07:24 PM #31
Pin 5 is connected to pin 3 on the MAX pot. This wire is soldered together with the red wire which connects to pin 1 of the MIN pot.
I have a feeling it's some kind of voltage divider... but I haven't given it the hours of research it'd deserve to get a definitive answer- I can't brain I have the dumb.
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23rd Dec 2019, 09:15 PM #32Diamond Member
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I fired up RustyCAD and came up with this schematic.
IMG_2932.jpg
It's 3 voltage dividers, with power and ground coming from 4 & 5, but it's ambiguous as to which is which, as it could work either way.
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24th Dec 2019, 06:49 AM #33
I need to get my hands on a copy of this RustyCAD. You are pretty good at the electrickery. Cheers
So I guess the next step is to probe machine pins 4 and 5 for power and ground, and identify the initial supply voltage, then it would be possible to work out the output voltage back to the machine for the purpose of amperage control. Although it's a Chinese foot pedal, I hope they stick to the convention that black wires are ground.
Might try zap myself with this after xmas.
Other possibilities might be the 'remote control' style rotary dial like the pipeline stick welding fellas use (my TIG also does MMA)
Then there is a whole world of cool applications with tig buttons, up/down switches, and the whole array of gear available as bolt-ons to reputable torches (CK / Binzel).
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24th Dec 2019, 04:44 PM #34Golden Member
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I wish my machine was a 3 wire potentiometer as that makes total sense to me. 2 pins has risk as I don’t want to be randomly testing stuff and fry the machine
I’m hoping when I get my torch here it will reveal all.
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27th Dec 2019, 10:04 AM #35Golden Member
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How does the 5 seconds thing work to activate remote control?
Whenever I do that it tried to start an arc (hf start) but even after holding it for longer than 5 seconds I don’t get it to activate remote control.
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28th Dec 2019, 07:11 PM #36Philomath in training
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May be of interest -
https://www.youtube.com/watch?v=-P6w-tj8_Tk
(and the first one - https://www.youtube.com/watch?v=nzKuQQKcclM)
Michael
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4th May 2020, 07:49 PM #37Golden Member
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- Sep 2009
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- Sydney
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Welding up some parts for my bandsaw this weekend and I decided to use the larger torch I bought, mainly because it has a button integrated in to the torch. A bit big (26) but easy to use. Plugged it all in, attached the gas hose and control cable.
Noticed when I turned on the welder that the light for the remote control was lit. That’s odd, I couldn’t get that to work last time! Interesting.
So I pushed and held the button and could get the torch to toggle between remote and panel. Interesting!
I then played with the amperage control and low and behold the amps on the welder changed. Admittedly way too fast, but I know why as I haven’t replaced the 10k pot for a 1k yet.
I wonder if I CAN get the foot control to work?
I stripped the control on the torch and couldn’t see anything complicated. Just a simple switch and potentiometer. Metered the cables from the torch to the connector. Again nothing complicated. So I rechecked all my wiring from the foot control I have to the measurements and locations of items I took.
Turned out I had followed the wiring from the manufacturer but actually looking at the torch this wasn’t correct. I was about to pull the trigger on the $250 pedal earlier but it’s now gone up to $450
An hour with the foot pedal, rewired the 3 potentiometer wires and what do you know, I got the pedal working. Again the amperage control is non existent because the pots in the foot control are 10k too, but I could get it to go from 0 to 20 to max on the foot control. I could also get it to turn on/off the remote setting.
Very pleased. Just need to replace the 10k pots for 1k and I’m in business.
The foot control is also junk, so I think I’ll rebuild it at some point like This Old Tony.
Cannot wait to get it done and finally have a go at welding with a pedal.
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4th May 2020, 08:50 PM #38
I had a used Kemppi R11F pedal floating about. These are a great pedal, smooth, adjustable spring tension, adjustable stop, ergonomic...
I ended up modding it with additional pots to make it work with my machine.
Once you know what the schematic of your particular machine is, any old pedal can work.
Pots can be changed, plugs can be switched, new wire harnesses can be added.
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4th May 2020, 08:52 PM #39Golden Member
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Yeah now I have the general wiring sorted I’m going to strip the cheap pedal and use the parts in a sturdier constructed DIY offering. Seems like mass is pretty important to stop it moving around, so I’ll likely build up a new frame for the existing parts, but likely after I replace the pots and have a play.
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