mm251 stutters and pops

[tackit]

Could a mig gun cause a MM251 to weld, sputter and pop, weld, sputter and pop again? When it welds it welds good for a few inches. IT's stutters on starts too. The machine is like brand new, it's only had one 33 lb roll of solid wire through it. it's getting worse, I could deal with it before today, but today was the last draw.... it's almost 44 mag time.

[tackit]

And for you removing that feature has actually helped your arc starts or overall weldability. I love my 251 and have never had issue with starts. I just can't use factory recommendations as they are never even ball park. What kind of steel projects are you blasting with that black beauty abrasive.

Yes! Miller told me to do it.. and it helped/worked, not all 251 machines have the start up problem it seems. Right now I'm working on a brake drum forge, Im using black beauty to take rust off steel I salvaged from a 275 gallon oblong oil tank to build a wind screen around the back of the forge.

[Texas113]

mm251 stutters and pops

And for you removing that feature has actually helped your arc starts or overall weldability. I love my 251 and have never had issue with starts. I just can't use factory recommendations as they are never even ball park. What kind of steel projects are you blasting with that black beauty abrasive.

[tackit]

This technology provides a smooth, spatter-free start. No pop-gun starts or spatter to clean up. It gives a temporary burst of energy on start up to help initiate the arc.

[Texas113]

mm251 stutters and pops

Please clarify one thing for me. What exactly is hot start and its function.

[tackit]

Tex, the #8 or # 79 wire removes the hot start from the machine... It seems to me the machine is welding much better in all respects period.

I run Black beauty through the blaster. I use a 1/8 pipe for the nozzle instead of the ceramic 3/32? nozzle Texas Blasters sent me with their hose. It was to small of a hole. The black beauty would plug the hose at the tip with the valve just barely cracked. In order for the media to come out so little of it could be sent through the hose it was hopeless to get anything done.

[Texas113]

mm251 stutters and pops

What is the purpose of the #8 or #79 wire? Is it something to remove only if it stutters and pops or something that can change characteristics of a good running 251.

[Texas113]

mm251 stutters and pops

I like that blaster. What kind of abrasive you using for the stated applications.

[tackit]

Fixed stuttering and popping

If you have a 251 that stutters and pops on starts you can remove the # 8 or #79 wire (depending on your machine) from the contactor block and your problems will go away... at least mine did. My 2003 MM251 has never welded so nicely since I pulled the # 8 wire off the contactor. Thanks Miller for the Tip The #8 wire is the wire with the yellow marker on it.

http://s1298.photobucket.com/user/cy...y/MHS%20Remove

[tackit]

I would also check the ground cable. They can act that way if ur loosing good ground. I personally don't like the OEM ground clamps, I replace them with a good brass one even on a new Michine. That Michine should handle a 44 lb. spool with no problem.
I would at least ck all ground connection nuts and grind area bare to connect ground cable.
Just a thought. Greg

Greg, I pretty much did what you're suggesting. thanks

[tackit]

isnt the machine still under warranty?

No it's a 2003 model. I think it's the heavy fiber spool that's at the heart of my problems.... could be the hole in the fiber spool isn't perfectly round and it's square cornering a bit as turns too. I'll check everything out and change the liner tomorrow. Something isn't right, It welds good until the sputtering starts. Seems to sputter on starts a lot that's why I'm thinking the weight of the wire could have something to do with it .

[weldonwelding]

isnt the machine still under warranty?

[tackit]

Here's the blaster Texas, we better not use the word bo-mb, Obama's police will come and get us.





http://s1298.photobucket.com/user/cy...Sand%20Blaster

[tackit]

I too like the Bernard guns for heavy use. Tackit I am interested in seeing some pictures of your "bomb" that you currently are blasting with. HaHa blasting and bomb used in the same sentence, wonder if that puts me on the "list". Seriously I would like to see how you built your sand blaster.

Texas I can't figure out how to use Miller's picture posting software and I can't remember if I have the blaster pics on my photo bucket account, if not I'll have to find the pics and run them through photo bucket and then post the link here.

Happy to help a Texan.

[Texas113]

mm251 stutters and pops

I too like the Bernard guns for heavy use. Tackit I am interested in seeing some pictures of your "bomb" that you currently are blasting with. HaHa blasting and bomb used in the same sentence, wonder if that puts me on the "list". Seriously I would like to see how you built your sand blaster.