gun power?

Yep i got the same gun i don't like the way they built it ,, anf the braid at the nipple is the wrong way to do it..

I got a gun from one of the members of the board that caswell sells i am going to give it a try this week... it is good to have a back up.. But i been using my pro gun more in the pass few months..

[Zpider]

When my cable broke off a tried some military high voltage connectors that was supposed to carry 60 kv, no luck at all, even a minor leak in the connector made the gun useless. So i dropped the iade very fast... but i agree it would be nice though..

[sdold]

I'm guessing a lot of these guns use the same power supply. Anybody know what powers the supply? 12V or so? I think it is, because the foot pedal switches 12V (it says).How about mounting the supply to the side of the gun? The power supply in mine is small, only about 3" x 1.5" x 1".

I believe there may be a Frankenstein gun coming, I'll post pictures if it appears.

I bet it'll have a removeable connector to the supply, since it'll only be 12V

It might even have a switch near the trigger that turns the HV on/off.

[seanc]

I had to take my gun apart recently to clean it (the trigger would stick open), so I decided to check the rest of the unit out while I had it on the bench. I've also gotten frustrated with the tangle of cords, and wanted to see what could be done about it.

Here's a crude schematic of the Caswell hobby gun:

Powder Gun Schematic

As you can see, AC is fed directly to the HV transformer, as well as to the DC control board. The foot switch simply activates a relay which turns on the HV, and activates the HV LED.

This wire, and the ground clip, could easily be made removeable.

I had considered plugging this unit into a variac, so that adjusting the incoming AC would result in variable output HV, but since the DC control board is also fed by this, it may either not operate at too low AC, or burn out at high AC.

The best way to make it variable would be to run a separate AC line to the HV transformer, and control that by variac. Since the HV transformer is fully encapsulated, there's no way to know what it's maximum input rating is, so there's still the chance of overloading it. But it sould work fine at reduced AC, to get lower HV for getting into tight spots.

Sean

[sdold]

Thanks Sean. I see a lot of HV supplies that run on 10-18 VDC, one of those might be the answer. I think mine might be the same as yours, because I think I saw a relay on the board.

Do you (or anyone) know if the HV output to the gun is positive or negative?

[seanc]

Do you (or anyone) know if the HV output to the gun is positive or negative?

I would suspect it's positive, since the ground wire, gun coax shield, and AC neutral all tie in to the chassis common.

[Popeye]

Usually it's a positive ground system on the DC HV side. We looked for quite a while to find a good adjustable power source, without luck.
You can find compact HVDC sources but most won't allow adjustable output and most are expensive.
The power supply's are either designed for adjustable I/O or they aren't.
I don't know for sure but it's doubtful you can vary the input power on a hobby system without cooking something..

The factory build these guns to there spec's. They are tested and it works for the factory and it is set at there levels.. If you want to adjust the power out put of the gun please look in to getting a pro gun:
http://www.caswellplating.com/powder/pro_system.html

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