Aram, The problem with the low duty cycle, low current welders, is that even when running .023 wire, they eventually overheat and shutdown.
I have a 60% duty cycle, 160 amp Mig welder and that will run.023 wire pretty much continuously if the current is set down to 75 amps or so. But perhaps for a proof of concept you can get by with a low duty cycle welder and just pause the process once in a while to allow the welder to cool down. Dave On 7/31/2014 3:29 PM, a k wrote: > hi > About powerful welding machine that have higher welding current. > i think that if main goal is to deposit as much as possible metal than it > is good. like in structural steel manufacturer but in my case people- > customers will bring caliber-micrometer- indicator - all imaginary > measuring instruments to see how close deposited part to original > print-model. i think in this case use of smaller wire will be better - > 0.022 something like that. yes it will take longer time to deposit but > accuracy of part is most important part. > maybe in the future possible to use two welders - like one for rough and > one for finish work-- heavy welder will fast deposit as much as possible > and small welder will do only external boundary to make part more accurate > -- close to the print dimensions etc. > some ideas > > aram > > > > > On Thu, Jul 31, 2014 at 8:27 AM, Dave Cole <[email protected]> wrote: > >> My phase converter is wired very close to this diagram. >> >> http://www.metalwebnews.com/howto/ph-conv/fig1.html >> >> I've made two of them using surplus 10hp 3 phase motors. For a while I >> could buy surplus 10hp motors that were new for >> about $200. That was about 14 years ago. >> >> I made one for my Dad that is wired like the one in the picture. As long >> as you hold down the start button, the additional starting caps are >> in the circuit. When you release the button the starting caps fall >> out. Those are needed just to get it spinning. >> >> Mine is a little more basic.. I throw the disconnect on and hold down a >> button which switches in the starting caps. Same idea, different manner >> to start the converter motor. >> >> The caps are adjusted to optimize phase currents in load motors. I've >> used this converter to supply power to a 3 phase transformer to increase >> the voltage to 480 volts - 3 phase to test drives. After the power is >> passed through a transformer, the currents and voltages are very well >> balanced. I used to use real starting caps but if you holld the >> button down too long the caps blow with a bang. So I now use regular >> power caps for everything. A timer could be used to switch out the >> starting caps also.. But it doesn't take much skill to start up the >> converter via a button. >> >> The biggest motor I have run off this converter is a 10hp motor on an >> air compressor. That was no problem but I turned down the max pressure >> from 175 psi to 150psi to minimize motor heating due to the unbalance in >> the motor currents. I often run a 5 hp lathe off the converter. >> >> >> Dave >> >> >> On 7/31/2014 3:55 AM, andy pugh wrote: >>> On 30 July 2014 23:04, Dave Cole <[email protected]> wrote: >>>> Phase converters are pretty easy to make if you have a spare 3 phase >>>> motor. >>> I made a partially succesful one once that also stepped-up the >>> voltage. Neutral between star-point and a phase, and then the three >>> phases from the phase ends. It needed a 1/4 hp single-phase (or a >>> rope) to spin it up, but once it was spinning it continued to spin. >>> >>> It wasn't a particularly well balanced 3-phase. >>> >> >> ------------------------------------------------------------------------------ >> Infragistics Professional >> Build stunning WinForms apps today! >> Reboot your WinForms applications with our WinForms controls. >> Build a bridge from your legacy apps to the future. >> >> http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > ------------------------------------------------------------------------------ > Infragistics Professional > Build stunning WinForms apps today! > Reboot your WinForms applications with our WinForms controls. > Build a bridge from your legacy apps to the future. > http://pubads.g.doubleclick.net/gampad/clk?id=153845071&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
