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Thread: Fixing up an Idealarc 250-stuck dial

  1. #1
    Join Date
    May 2021
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    Fixing up an Idealarc 250-stuck dial

    Hi all, first post here. I do some basic fab stuff out of my garage and recently picked up a 60's Idealarc 250. I took it apart for a good cleaning since it looks like it was sitting in a barn for a while, and I'm having trouble with the amp adjustment. The 2 small gears for the dial move freely, but the shunt(rotor?) inside the reactor seems to be locked up tight. Loosening the rotor support screws and the front&back does not seem to have helped. Am I missing something here or do I just need to apply more muscle?
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  2. #2
    Join Date
    Jun 2014
    Location
    Southern Illinois
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    985
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    Re: Fixing up an Idealarc 250-stuck dial

    Well those have a close fit in the transformer core. I would suspect itís bridged over with rust. Iíve never scene that but I guess itís possible. Try soaking with PB and slightly moving it back and forth. If you get it free the next trick is setting those tension bolts on each end of the rotor. If they arenít tight enough when you strike the arc it will spin the adjustment wheel.


    Sent from my iPhone using Tapatalk
    Steve

    Miller Dialarc 250 (1990)
    Miller Maxstar 140 STR (2003)
    Lincoln SA200 Redface Pipeliner (1966)
    Lincoln MP210 (2015)
    Victor and MECO torches

  3. #3
    Join Date
    May 2007
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    Re: Fixing up an Idealarc 250-stuck dial

    power it up. then do it

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