Power Switch - Nu-Mig 165

[Kernite]

Having almost mastered welding at one setting I decided to advance my skills! to see the changes at different speeds and power settings and the switch broke. No power at settings 2 and 3. 3 is the one I was using for 1-2mm sheet. I will be working on a Landrover bulkhead and reckon 4 will be a bit too powerful. Although could speed up but would definately blow some holes.

Weldequip have kindly offered to look for a replacement switch for me. My thought whilst the switch is out of the machine was that in that my work will be on thin metal and I know 3 is the best setting is there any reason why I can't hard wire the switch to the 3 terminal and have it running on just one power setting.

As as an extra question if anyone has an old Nu-mig 165 to canabalise for spares or knows a suitable replacement switch please let me know.

I know nu-Mig have bad press on this site but it meets my needs as a tool for learning so am looking for a solution other than "buy a new welder".

Many thanks for any help.

Jonathan

 

[mike 109444]

If 4 and 5 are working you could rewire switch back to frount ie 6=1, 5=2, 4=3, 3=4, 2=5, 1=6 BUT you would have to get your head round what the wires currently do and make sketches of before and after and mabe take digi photos.
Mike from not so sunny south Bristol

 

[Kernite]

Thanks Mike.
Switch now out and whilst the dial knob gets stuck at random positions I have continuity on all but switch position 3.
If the first number is the dial setting (switch position) and the second number is the position on the switch mechanism then I have
1 = 2
2 = 6
3 = 10
4 = 12
5 = 4
6 = 8

I connected the wire on 10 directly to the main supply lead but got no current which either means I have another problem elsewhere or my connection was too Heath Robinson.

Taking Mikes point I will try connecting the wires for power setting 3 and 4 to the switch mechanism sites for 1 and 2 since these have continuity and work smoothly (although earlier I was not getting power on 2) failing that I could use positions 5&6. My concern is not knowing why there are two wires to positions 4 and 8 (Green and Red). I assumed this was a simple switch mechanism but two wires for the higher power settings suggests something more than my basic knowledge.

Will wire up and have a go with switch positions 1 and 2 operating power settings 3 and 4.

 

[Kernite]

Sprecher+Schuh

Had a quick internet search on Sprecher + Schuh and pulled off a pdf of the rotary switches but unlikely to be current stock.

http://www.sprecherschuh.com/download/sscdn8500/Section_K/Section_K_v0208.pdf

 

[Kernite]

Thanks mods for moving
Sorry for posting in wrong place

 

[Kernite]

Switch in bits

Had offers of support for new switch (although not guaranteed) always the 2nd option. Sound advice from Welequip not to touch the switch but having had it stood on my desk for some time curiousity got the better of me today and its a working switch no more

Its actually a neat mechanism and if I had just looked in the first module would have sorted it as I trimmed some rough plastic and greased the ball bearings and it all now works smoothly. The problem was that I took off two modules and this pulls out one of the snail mechanism that activates the two switches on each module. I did not see the alignment so when I put it back together I did not have continuity on some terminals and on others I had continuity on two terminals which I felt was not right. I expect I have to realign the snails so they activate the switches in the right order. There are three modules and 3 snails.