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Lincoln ranger 8


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  #1  
Old 02-26-2019, 09:15:30 AM
Varmint1 Varmint1 is offline
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Default Lincoln ranger 8

Picked up a ranger 8 over the weekend, have around 110-117 a/c volts at receptacle, very cold d/c at rod, can burn a 6011 on a/c with it turned all the way up to the 225 mark but still burns like itís set at 70 amps. Check slip ring resistant and getting 4.8 ohms. But when measuring from slip ring to chassis ground I get nothing but if I touch the ring while Iím taking reading i do get around 160 thousand ohms, do I have a bad rotor? Iím getting about 34 volts a/c at brush leads.
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Old 02-27-2019, 01:03:25 PM
Zephyr7 Zephyr7 is offline
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Default Re: Lincoln ranger 8

This might just be measurement error. Try two things to be sure:

1- poke the points of the probes in and twist a little, then hold while pressing them in with some force. On older gear, itís common to have an oxide layer on metal parts that is resistive and will make measurements be off, and make them inconsistent. Using a sharp probe point and some force will help to pierce the oxide layer so that you can get reliable and consistent measurements.

2- the change in your measurement when you touch the ring might be due to capacitive loading from your body on the high-impedance meter. If itís capacitive loading, youíll see the reading drift over a few tens of seconds as your body capacitance charges up (or discharges).

If you donít show a path to ground with your meter, then there shouldnít be a path to ground when you touch the ring, except for through you which shouldnít be completing a circuit in this case.

Bill
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Old 02-27-2019, 03:12:07 PM
Varmint1 Varmint1 is offline
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Default Re: Lincoln ranger 8

I’m going to do some more testing, hopefully I won’t need to have the rotor rewound. Thanks Bill for the information
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Old 02-27-2019, 09:42:35 PM
Varmint1 Varmint1 is offline
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Default Re: Lincoln ranger 8

Ok I did some thinking about the rotor, testing between rings I get 4.8 ohms, the book says to test one ring to chassis ground and I should get 500,000 ohms, I think that’s a miss print because I would get that if it’s dhorted to ground. Retested this evening, slip rings I get 4.8 ohms, calls (4-5 ohms) slip rings leads while running 35.8 vdc (37-46 vdc) check bridge rectifier 35.2 vac (36-43 vac). Little low I think is due to not at high idle. So I pulled all diodes out and wire brushed to remove any corrosion and tested, two shows open and two shows resistance both ways, my question is would it still try and weld like that?
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Old 02-28-2019, 10:41:16 AM
Zephyr7 Zephyr7 is offline
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Default Re: Lincoln ranger 8

Are those diodes in a bridge rectifier that are showing ďtwo openĒ and ďtwo both waysĒ (thatíd be shorted)? Sounds like the diodes are all bad, but the windings are ok. Thatís good! Diodes are much easier to fix

Iíd replace all the diodes. They should be fairly cheap, and itís easy to get suitable new replacements even for old stuff.

Bill
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Old 03-03-2019, 07:22:00 PM
Varmint1 Varmint1 is offline
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Default Re: Lincoln ranger 8

I’m going to replace all four diodes. Through air gas, and also I talked to Lincoln they are around 120 dollars apiece but found some on a web site for 52 dollars apiece. But for what I got this machine for I can put so money into it
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Old 03-04-2019, 01:22:21 PM
Zephyr7 Zephyr7 is offline
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Default Re: Lincoln ranger 8

They must be awfully beefy diodes if they are $52 each.

Are you quoting through welding supply places or electronics supply houses? Welding places will probably charge more. Iíd try calling galco industrial electronics and ask them. You might be able to save a lot of money that way.

Bill
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Old 03-04-2019, 02:25:57 PM
Varmint1 Varmint1 is offline
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Default Re: Lincoln ranger 8

That’s the web site I’m going to be getting them from
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Old 03-04-2019, 04:44:59 PM
Zephyr7 Zephyr7 is offline
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Default Re: Lincoln ranger 8

Quote:
Originally Posted by Varmint1 View Post
Thatís the web site Iím going to be getting them from
I guess theyíre just pricey diodes then. Gallo has always had fair prices when Iíve used them.

Bill
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