Show HN: I built a CNC-machine from scratch, using 40x 3D-printed parts

Re:Show HN: I built a CNC-machine from scratch, using 40x 3D... by dekhn on Wednesday November 03, 2021 @11:23PM (#29103379)

I suspect he means that you want to move quickly through aluminum, especially if you don't have active cooling. If you move slowly you can get problems like chip welding and everything goes south.

I actually didn't have enough torque to move the router through lots of material until I moved to some fairly serious stepper drivers and configured them to use max current and voltage (IE, I got a 48V, max 20A power supply). Even then, if if accidentally move the router bit while it's not spinning into the work, the motors stall well before the bit breaks (1/4" carbide end mill).

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Re:Show HN: I built a CNC-machine from scratch, using 40x 3D... by giantg2 on Wednesday November 03, 2021 @11:56PM (#29103552)

I guess if they're getting welding there's no sprayer set up. Some emulsified oil (10% Ballistol) usually works great for lube and cooling, even in small quantities.

Yeah, that makes sense. That sounds like it's really not that much torque the way you describe - just above functional minimum and no where near too much (eg people forcing it through and breaking bits).

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