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Discussion Starter · #1 ·
How are they in comparison to premier? I know they are half the cost, and they utilize your stock alt. but was wondering if they suck.
 

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Email Rockbuggy on the forum, he just installed one in his rig, and he used it the other night to weld a fence up.. I was there, seemed to perform GREAT! Ask him for more details though.
Scott <IMG SRC="smilies/grinpimp.gif" border="0"><><
 

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I don't know specifically about Mobi weld, but I have a Jeff Fretwell "option #2" home brew welder and I can compare it to the claims made by some of the other companies.

Some of their claims are hype; some are not:
High frequency DC! They are all high frequency DC, even stock alternators and it doesn't really matter.
Hand wound stator, 12 gauge! My stock Ford 90A alternator has 12 gauge wire in its stator, but it is probably not hand wound.
110 V DC outlet. The stock Ford alternator will easily put out 110 V DC to run brush type power tools. The big difference is on the commercial products the 110 V is regulated; I have to regulate mine by regulating the engine speed.
Runs 1/8 inch rod. My 90A alternator will light and burn 1/8 rod at an engine speed of about 2,500. It easily runs 3/32 rod at 1500 RPM.
Only draws 4-7 A from your battery while welding! The stock Ford 90A alternator only draws 7A at full field.
This is not hype: Cost difference -
Commercial welder $500-1000
Home brew $50 including cables. (I'm not using the 110V regulator)
http://www.pirate4x4.com/tech/on-boardwelder/index.html
 

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Interesting....

For some reason I keep wanting to run a small lawnmower engine in the bed of my next rig with a 12 volt alternator and a converted alternator/welder or maybe a generator...

I think it would be cool <IMG SRC="smilies/glasses.gif" border="0">
 

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Discussion Starter · #6 ·
Originally posted by Pin Head:
<STRONG>I don't know specifically about Mobi weld, but I have a Jeff Fretwell "option #2" home brew welder and I can compare it to the claims made by some of the other companies.

Some of their claims are hype; some are not:
High frequency DC! They are all high frequency DC, even stock alternators and it doesn't really matter.
Hand wound stator, 12 gauge! My stock Ford 90A alternator has 12 gauge wire in its stator, but it is probably not hand wound.
110 V DC outlet. The stock Ford alternator will easily put out 110 V DC to run brush type power tools. The big difference is on the commercial products the 110 V is regulated; I have to regulate mine by regulating the engine speed.
Runs 1/8 inch rod. My 90A alternator will light and burn 1/8 rod at an engine speed of about 2,500. It easily runs 3/32 rod at 1500 RPM.
Only draws 4-7 A from your battery while welding! The stock Ford 90A alternator only draws 7A at full field.
This is not hype: Cost difference -
Commercial welder $500-1000
Home brew $50 including cables. (I'm not using the 110V regulator)
http://www.pirate4x4.com/tech/on-boardwelder/index.html</STRONG>
And how may i ask did you make this?
 

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"And how may i ask did you make this?"

It is pretty much exactly like the "option two" described in Jeff Fretwell's tech write up on the link above. I had an extra pully on my York compressor, so I mounted a 1982 Lincoln 90A large case alternator on top of the York. I ran an on/off switch from the battery + to the field terminal. The welding leads attach to the B+ and case of the alternator. I didn't wire up the 110 V DC outlet box, because I don't think I would use it, but I was screwing around with it and I noticed it will run my 4.5 inch angle grinder. I don't plan on leaving it mounted on the engine but only mount it when I need it. I would like to put in a cable throttle so that I don't have to jam a screwdriver into the throttle linkage to rev up the engine. So far, I have $15 and 3 hours of labor in it because I am using the leads from my buzz box right now.

It even makes the high pitched "whistle" while welding that one of the manufacturer is so proud of.
 

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I run the same type setup and it works very well. I did install a 110V outlet for the heck of it. Tested it but have yet to really use it.

I use a 140A alternator and get about 32 volts per 1000 rpm. but the 90-100A alternator would would fine as well just need a little more engine speed.

Jay
 
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