MadModder
The Shop => Tools => Topic started by: vtsteam on June 12, 2025, 02:31:21 PM
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What's inside a Harbor Freight 240 volt spot welder? Well the switch on mine was starting to act flakey, so I decided to find out.....
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End cap left, fixed handle lying on top of main body with switch wires and switch, moveable handle above that. Handle pin partly removed at front.
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End cap removed:
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The cap and back end of transformer windings
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The fixed handle and trigger wire running down channel to the switch:
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Switch with ring of paper insulator
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Switch wiring
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Switch construction
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Switch contacts
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The front arms. Upper moveable arm removed. Sits in cast aluminum retainer, attaches to brass contact shell:
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The handle pivot showing straight knurl for "press" fit (doesn't work well)
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Upper arm contact (brass right) lower arm contact (copper center) and pivot
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Upper and lower arm contacts (front view)
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Lower contact, showing insulation at bottom
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