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   rec.crafts.metalworking      Metal working and metallurgy      215,319 messages   

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   Message 214,944 of 215,319   
   Snag to Bob La Londe   
   Re: Odd readings was : Electronics quest   
   28 Oct 25 19:45:24   
   
   From: Snag_one@msn.com   
      
   On 10/28/2025 6:55 PM, Bob La Londe wrote:   
   > On 10/28/2025 3:23 PM, Snag wrote:   
   >> On 10/28/2025 5:09 PM, Snag wrote:   
   >>> On 10/27/2025 3:50 PM, Snag wrote:   
   >>>>    I got the new pot installed in the foot pedal to my TIG machine   
   >>>> today . Same 47k ohm rating as the original . But there's something   
   >>>> weird going on , I'm not getting the amperage I set the dial for ,   
   >>>> it's lower than the setting . Not an earth shaking problem as I have   
   >>>> never used the full amperage and I can control it now . Still , I'd   
   >>>> rather get the amperage I have it set at instead of guessing .   
   >>>   
   >>>    I checked the resistance on that new pot . And I got some odd   
   >>> readings ... I get 21k maxed out one side and 46k the other side .   
   >>> Outside terminal to outside I get the 47k plus/minus . THis may or   
   >>> may not have something to do with output not matching set point . The   
   >>> other pot measures 47k+- maxed out both ways . I'm having a hard time   
   >>> understanding the different values , AFAIK these all use a single   
   >>> wiper center contact so I should be getting the same reading from   
   >>> either side when maxed out .   
   >>   
   >>    I should note that the "other pot" mentioned above is the other new   
   >> one . The old one has readings so unstable you can't tell what they are .   
   >   
   >   
   > Has to be disconnected to get a good reading.   
   >   
   >   
   >   
      
      It was unplugged from the welder . Checked at the plug per the   
   diagram and instructions I downloaded and printed last night . I have a   
   closer match to the original part on the way thanks to David Billington .   
   --   
   Snag   
      I appreciated foreign cultures more   
   when they stayed foreign ...   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

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