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Toot

Written by Koz Ross on 2025-01-10 at 20:22

I've been investigating (slowly, with a lot of help from @jookia and @amd ) a #DIY #CNC build. In the process, I have learned a lot of things, and felt like sharing some of what I've learned.

One example is from this video: https://www.youtube.com/watch?v=clgpZJFoqIQ

The tl;dws are:

1. Stepper motors (closed or open loop) never hit their holding torque at any rotation.

2. Servos have less peak torque, but hold it at any rotation speed they're rated for.

Conclusion for me: servos and gearing are best here.

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Descendants

Written by Koz Ross on 2025-01-10 at 20:25

The servos in the video are still available (the link in the video description is dead): https://www.aliexpress.com/item/1005008294907182.html

They also come in a range of torques and prices, but the prices don't differ by much. While their voltage range would suggest 32 or 36V power, as the video shows (and Stepperonline themselves claim) 48V is fine, and probably preferred.

Gearboxes are still a matter of research for me.

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Written by amd on 2025-01-10 at 20:32

@koz @jookia

closed loop is a big win for servos on a cnc too. I wouldn’t want to be losing steps when you’re doing a subtractive process.

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