Hacking a SX2 Mini mill

SX2/CN2 tachometer kit in action
SX2/CN2 tachometer kit in action

I picked up a SX2 Mini mill recently via Little Machine Shop (They call it the HiTorque Mini Mill 3900). When I received it, I noticed there was a port for a digital tachometer readout on the side of it. I though this might be useful, but felt 125$+ for it was a little excessive for what it was. Atop of this, they were out of stock.

I ended up reverse engineering the protocol, building some less expensive kits, and documented how exactly I figured out the protocol. Along the way, I also discovered how to make the mill run in reverse!

If you wondered how a reverse-engineering problem like this is approached or what tools are used, this could be an interesting read:




Holy smokes, that was a quick comment!

It should be fixed now. Thanks for catching that.

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