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The rollers on brand name machines don't wear out easily, so unless they've been slipping since day one and/or you've been through a several hundred pounds they (rollers) wouldn't be the 1st thing I'd check.
I just recently had the same problem with inconsistent wire flow out of my Miller 140 AutoSet. I took it to my local Miller Service Center. The salesman I have purchased a machine from in the past told me that it was most likely the wire sleeve that tends to get a slight bend causing the wire not to flow smoothly.
Sure enough, he pulled it out of my machine and showed me the area with the slight bend. He showed me how to replace it and tested my machine. It worked fine after that. His advise, when preparing the unit for storage, was not to roll up the cable up in small loops and, when welding, not to bend or twist the cable near the gun.
In my opinion, this is another good reason to buy from your local dealers instead of over the Internet.
when welding i cant get a steady wire feed could my feed rollers need replacing or is it something else thanks
If your drive roller is double grooved, try flipping it around just for the heck of it. I have that phenomenon with my Millermatic 200. Never could feed .035 wire with that groove, have to use the .030 groove.
Try adjusting the tension knob too.
Nothing welded, Nothing gained
3 ea. Miller Dynasty350DX
ThermalArc 400 GTSW
MillerMatic200 with spoolgun
Linde UCC305 (sold 2011)
PlasmaCam CNC cutter
Fadal Toolroom CNC Mill
SiberHegner CNC Mill
2 ea. Bridgeport
LeBlond 15" Lathe
Haberle 18" Cold Saw
Doringer 14" Cold Saw
6 foot x 12 foot Mojave granite