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 Posted: Tue Mar 13th, 2018 03:30 am
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Tristan Crider
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*arcing*  (Tried to fix spelling error) I'm getting arcing at the power terminals..  Am I missing a piece here? These are new insulators and only the plug is wired up! Any suggestions? .

Last edited on Tue Mar 13th, 2018 02:51 pm by Tristan Crider

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 Posted: Tue Mar 13th, 2018 12:29 pm
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Kim Frank
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Are you using the mica washers as insulation between the terminal plate and the terminals nuts?

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 Posted: Tue Mar 13th, 2018 01:54 pm
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Tristan Crider
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I used what was left of those for the terminals on the back of the motor. I assumed plastic would be enough since it's not a conductor. hammer:  Also the arch happens without nut attached.. Through the end of the threads and onto the plate.

Last edited on Tue Mar 13th, 2018 02:46 pm by Tristan Crider

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 Posted: Tue Mar 13th, 2018 03:08 pm
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David Allen
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That's strange!

Just an observation, looking at the tips of the screws. It looks like maybe they are bottoming out against something? I see shiny brass there. Could they be going in too far and touching something?

Also, is there any sort of paint or coating on the terminal insulator? Could this coating be conductive?

Another question, have you used an ohm meter to see what sort of resistance is existing between the terminals?


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 Posted: Tue Mar 13th, 2018 04:06 pm
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Tristan Crider
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Strange indeed.. Setting the multi meter to kΩ I get 0.52 when I touch the top of the brass to the bottom of the plates and there should be nothing since it's insulated by plastic....  There is no paint on the insulator and they are new. I don't think it's bottoming out on anything and I even tried electrical insulating varnish on the square brass shaft because I thought maybe the arcing was inside somewhere.. I'm about to make a whole new plate out of plastic or wood.. I really don't know what to try.

Last edited on Tue Mar 13th, 2018 04:08 pm by Tristan Crider

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 Posted: Tue Mar 13th, 2018 06:50 pm
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Tristan Crider
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 I made a new terminal base plate out of hard plastic and installed everything as before and it works fine.. For some reason the brass was shorting out through the plastic insulator. For anyone else who is having this problem in the future or rebuilding a cake I would suggest trying the derlin insulators first. Maybe they would be better? WHo knows. Thanks for the help!

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 Posted: Tue Mar 13th, 2018 07:04 pm
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David Allen
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Tristan Crider wrote:  I made a new terminal base plate out of hard plastic and installed everything as before and it works fine.. For some reason the brass was shorting out through the plastic insulator. For anyone else who is having this problem in the future or rebuilding a cake I would suggest trying the derlin insulators first. Maybe they would be better? WHo knows. Thanks for the help!


That's crazy, but strange things happen sometimes.  I have had a plastic terminal board become conductive before and create spectacular fireworks. Somehow the chemistry can change.

Anyway happy for you that it's working now!

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