The Smell of Molten Projects in the Morning

Ed Nisley's Blog: Shop notes, electronics, firmware, machinery, 3D printing, laser cuttery, and curiosities. Contents: 100% human thinking, 0% AI slop.

Rectifier Mounting Screw Tweakage

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The sewing machine motor runs from 120 V AC or DC, drawing a few amps with the rotor locked, so a hulking 300 V 10 A bridge rectifier (Motorola MDA962-4, if you’re keeping score) seems grossly overrated. On the other paw, I have one, so why not?

The mounting holes pass 6-32 machine screws, but the recesses in the top seem meant for fillister head screws that I don’t have. Fortunately, I do have a lathe:

MDA962-4 rectifier - screw head adjustment
MDA962-4 rectifier – screw head adjustment

And then they just drop into place:

MDA962-4 Bridge Rectifier - installed
MDA962-4 Bridge Rectifier – installed

You can see why recessing the screw head below the top of the rectifier is a Good Thing.

That was easy…

Comments

One response to “Rectifier Mounting Screw Tweakage”

  1. Kenmore 158: Motor Flyback Diode | The Smell of Molten Projects in the Morning Avatar
    Kenmore 158: Motor Flyback Diode | The Smell of Molten Projects in the Morning

    […] The four NTC power thermistors lie just to the right of the relay, before the bridge rectifier. […]