Tool Pack Rat
- Stone Mountain, GA USA
With a PWM controller, you would be surprised what the little SIP motor can do.
Might be interesting. I would think replacing the transistor with a adjustable voltage regulator would not be difficult.Can I post a SIP circuit board across for you to play with? It would be a fun thing to try.
I've measured volts into the welder and it's quite constant at 240V while the welder is welding. Here's the post with the measurements if you have any ideas. I'm convinced there is an electronics fault in the PCB and Weldequip has very kindly sent another PCB for me to try, though he is thinking torch liner problems due to underuse. Hopefully can try it at the weekend.What time of the day does the settings drop? if its 9am 12pm or 5 pm which is when everyone is making breakfast lunch and dinner there will be a voltage drop
Would be interesting to see how far the forum can develop the SIP welders. I'd like to do some sort of objective measurements like grey shirt guy to quantify the various improvements. Baseline ought to be with the original torch liner. Probably won't get around to doing anything until about March, but we could get a design before then. Could always send you the PCB from the SIP I have and pick up another SIP for the actual measurements.Might be interesting. I would think replacing the transistor with a adjustable voltage regulator would not be difficult.
Might be interesting. I would think replacing the transistor with a adjustable voltage regulator would not be difficult.
Would probably need a different potentiometer as it would need to go across the motor.
Or replace the pot with a pulse width modulator to switch the tranny on and off, this would increase low speed torque and reduce heat dissipation in the transistor.
Maplin do this http://www.maplin.co.uk/module.aspx?ModuleNo=30310&doy=19m12
It will only work from 6 to 15v, but I see no reason why it shouldn't be used to drive the base of a power tranny instead of a motor.
Coupled with Bump's independant PSU it could be a neat solution.
My little welder is one of the type that adjusts wire speed with voltage setting.
A lot of machines give a coarse adjustment with the voltage selector, leaving the speed knob for fine adjustment.
Malc is saying that his Portamig is one of the type that adjusts wire speed WITH the power settings. I take that to mean it is the SAME control knob for both power/wire speed -surely not?
This is how my small SiP works.
Can't speak for the Portamig, but my SIP adjusts the speed with the power knob, the speed knob itself is used to fine tune the speed.
That is right. I am only referring to and interested in the portamig here. Still awaiting weldequip`s thoughts on this though. Being able to adjust wire speed independently of the power settings is one of the key features of the portamigs i would say.