Gallery, Projects and General > The Design Shop
Microwave owen transformer spot welder?
PekkaNF:
--- Quote from: philf on December 26, 2015, 12:54:25 PM ---Pekka,
I can't picture exactly what you're trying to do but why can't you connect the cable directly to one end of your 20mm copper electrode holder?
:beer:
Phil.
--- End quote ---
That was my original plan, but then I need to mill a lug where the connector fits. This prevents me from using both ends of the bar 90 and 45 degree angles.
But it would work and is plan "B".
Pekka
PekkaNF:
Made almost full recovery...just before starting a new workweek.
I ordered some electronics stuff. I think thyristors will be fine....just about...ordered some spares and then one size bigger, takes more current, but gate current is higher too. have to check if the opto will trigger it. it looks like it does. Ages when I measured voltage/current with scopes.
Now the happy situation is that electrical components will come in a week or two and in meantime I can start to play with the mechanical part, which I think will be more straightforward!
Oh, and I got a piece of copper tube ID 20 mm and outside 22 mm, tried and it is a nice sliding fit. About 66m2 of cross section area if I need to go that way.
Pekka
PekkaNF:
Got electrical board ready and tested on open secondary. Seems to work.
Has been too cold to work on mechanics.
A little progress.
Pekka
PekkaNF:
And the electrical parts looks pretty much like this.
Just wonder how to measure thysristors on the circuit. Have to take oscilloscope out of the shelf and power it up.
* Osciloscope does not syncronize...No trigger function works....old philips 10MHz unit.
Any ideas for a new scope. I don't need it that often, but when I do, I really need it.
Pekka
PK:
Really silly good bench DSO's are quite cheap if you avoid the premium brands. Check out the Rigol range.
If you are doing mostly power electronics, then an isolated scope is just the ducks nuts (as we say in my country). We recently bought one of these: http://siglent.com/ENs/pdxx.aspx?id=93&T=2&tid=2
As a scope, well it's OK, low res screen and a slow UI. But I can poke probes into a live panel with a reasonable chance of survival, which I quite enjoy.
Nb, the non isolated variants are dirt cheap, but then you have a non isolated, slightly crappy scope! You're better off with a bench scope.
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