SIP Drive motor

  1. Mattycoops43 Member

    Messages:
    58
    Location:
    Newport, South Wales
    Hi everyone.

    It's been a long time since I have been on here, I did all the mods to my SIP topmig 130T a couple of years ago and have been using it very successfully ever since.

    Today I just finished a job and the wire stopped feeding, the drive motor has given up the ghost. I tried cleaning it out with some WD40 and it started again, but then caught fire. :D

    Is there a better alternative than a SIP spare, (assuming I can get one), It is just a standard small electric motor. I have not looked yet to see how the drive is attached? I am assuming it is interchangeable.

    Does anyone know the size of motor I need? Can I put in a motor that will run a bit faster as on high settings I am running out of wire speed.

    Thanks.

    Matt
     
  2. skotl

    skotl Forum Supporter

    Messages:
    6,060
    Location:
    Edinburgh, UK
    A long, long time ago @mike 109444 had some spare motors - dunno if he'd still have one.

    That said, it is just a ~20-24VDC motor so you should be able to swap it out as long as either the shaft or gearing matches.
     
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  3. pedrobedro

    pedrobedro Man at Matalan

    Messages:
    9,173
    Location:
    CX Derbyshire
    You can get a motor and feed combined on eBay for about £20, cheaper if you can wait for post from China. Just put mig welder wire feed motor in the search.
     
    Mattycoops43 likes this.
  4. Mattycoops43 Member

    Messages:
    58
    Location:
    Newport, South Wales
    Thanks I'll have a look. I was searching too specifically and getting nowhere. Probably a good chance to dump the rubbish roller set up which needs bracing.

    Matt
     
    Sean likes this.
  5. mike 109444

    mike 109444 Member

    Messages:
    4,007
    uk Bristol
    If you are any where near the Royal Gwent hospital next Thursday (working in there) then I can chuck a couple in the car if you want to give them a try FOC.
     
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  6. skotl

    skotl Forum Supporter

    Messages:
    6,060
    Location:
    Edinburgh, UK
    Very generous, as ever, Mike :thumbup:
     
  7. Sean Another 602 fan

    Messages:
    976
    Edinburgh
    Watch the shaft diameter id looked in to replacing the motor on mine but finding a motor with the small spindle was difficult

    Ebay £20 wire feed assembly would be my route

    (Might still do it even though ive fixed my welder problems by buying a thermal arc 181i)
     
  8. Mattycoops43 Member

    Messages:
    58
    Location:
    Newport, South Wales
    Thanks for the very kind offer!

    I already had one on order, I got the £20 gearbox and motor off ebay. Fitted it this afternoon. Bit of a job as I had to recess it down by 13mm into the welder but it's welding SO much better. Only thing I need to do now is change from a 20v PSU to a 24v as the max speed is a tad low. Ok up to setting 4 but not enough speed for 5 and 6. I think the previous motor may have been a lower voltage, which would explain it burning out (although 15yrs is not a bad stretch)

    I picked up a 2.8kva generator today for next to nothing. I am hoping it will power my 130A mig at least up to half power? Going to have a play tomorrow. At least being able to weld thin stuff in the middle of nowhere will be useful.
     
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  9. skotl

    skotl Forum Supporter

    Messages:
    6,060
    Location:
    Edinburgh, UK
    Glad to hear your welder is moving on! I found that all of the fiddling and fettling meant that I ended up knowing way more about how welders work, than I did at the start!

    As for the generator question, it's been asked many times on here; just search for "welder generator" or, more simply; "generator".
    The first point is that you need to ensure that your genny has an AVR (auto voltage regulator), which is a half-mechanical/half-electronic bit of trickery that pushes the generator's RPM to supply the required voltage. If your genny doesn't have an AVR then you shouldn't try it with a welder, or any other inductive load, otherwise you could damage the generator and/or the welder.

    Next thing is that an inductive load needs two-to-three times its stated load at startup. Assuming a 130A (at 50VDC) welder at full tilt then that's 130*50 = 6500w. Add the inductive startup requirement of 2-3 times then you're at 13KVA to 19.5KVA (I'm assuming watts == KVA, which is probably close enough for this).

    If we work backwards from your 2.8KVA generator, then that suggests a maximum supported load of 56A at 50V. Divide that by two or three and your welder might start at 28A (for 2x) or 18A (for 3x).

    Log story short; if your generator doesn't have an AVR, then don't plug a welder into it. If it does, and it's rated at 2.8kva then you shouldn't push your welder beyond 18 to 28A indicated.
     
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  10. Mattycoops43 Member

    Messages:
    58
    Location:
    Newport, South Wales
    Thanks.
    My idea was basically to try the welder on the lowest power setting, see what kind of load it is putting on the generator and try the next setting etc. It has a voltage gauge on the side and when the seller demo'd it, he plugged a kettle into it, and the voltage stayed the same but the engine note changed so I am pretty sure it is regulated.

    My thoughts are probably to leave the mig in the workshop and look at one of these small inverter arc units for mobile stuff., but again, only for thin material

    Matt
     
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  11. mike 109444

    mike 109444 Member

    Messages:
    4,007
    uk Bristol
    Good to see you got it sorted Matt.
    You might want someone watching the generator while you strike up with your mig just in case it does not like it! Or set up your mobile phone to record the display on the genny while you weld.
     
    Mattycoops43 likes this.
  12. Mattycoops43 Member

    Messages:
    58
    Location:
    Newport, South Wales
    Good call. I can rest my hand on something, and get the gap set up, then hit the trigger while watching the dial. Just like tacking without a visor! :D
     
  13. Mattycoops43 Member

    Messages:
    58
    Location:
    Newport, South Wales
    Just an update for anyone who is interested. Today I finished my mig off, I had done the drive motor, but then I fitted an adaptor of the correct 24v to power it, as it was running on 20v before.

    HUGE difference. It now welds beautifully on all power settings, I have never got it to weld properly on full power before. now the wire speed is so stable I can turn it right down so I get a beautiful stable arc, almost no spatter. Now I have a welder that is actually welding properly, I need to do some proper practising to refine my technique rather than just splatting weld on. I had a play today found the perfect horizontal weld speed would just drip off a vertical weld, but a much higher setting worked really well. Previously I have not really messed with speed setting unless I changed power, but I think I was just running it all too fast.

    Sadly a 2.8kv Generator is no match for a mig even on setting one, It would try, but the gen was pulsing up and down trying to keep up as the arc formed and exploded. No probs. The genny was a bargain and I can sell it for what I paid. Put the money towards a DC welder.
     
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  14. skotl

    skotl Forum Supporter

    Messages:
    6,060
    Location:
    Edinburgh, UK
    Good work - pleased for ya :clapping:

    It's really satisfying when something like this works out, and it makes such a difference!
     
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