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.

The New Hotness

  • Rectifier Mounting Screw Tweakage

    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…