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A project log for Grinder Minder

Bench Grinders are everywhere. So are fingers. May the two never meet. That's where grinder minder comes in.

Scott SwaaleyScott Swaaley 07/29/2019 at 17:380 Comments

Since our sharp left turn last month, we've been heads down working out a prototype. We took advantage of the awesome folks at MacroFab and had a PCB made. Then ... of course ... we realized the mistakes we made on layout and had to hack it a bit (well, a lot). This is how it looked going into our first test.

Big picture - this PCB contains a few parts.

  1. High-voltage high-power AC: big fat relays, big fat traces (2oz / 3mm), and lots of nothing (large spacing) to prevent arcing or shock.
  2. High-voltage high-power DC: we're testing some ideas for a high-power-density DC source (see previous post). You definitely don't want to touch this part
  3. Low voltage controls: galvanic isolation is a big deal so we've isolated all low-voltage stuffs and kept it simple. Digital controls but it's all logic - so software or firmware.

Next it's time to turn it on!

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