Centroid Community CNC Support Forum

Hi everyone,

Today, my TMC AC servo motors arrived, and I started setting them up.
I configured them to run at **4000 steps per revolution**, which was straightforward.

I'm aiming for a **G0 speed of 8000 mm/min**, but unfortunately, **Centroit Acron only allows me to set 1200 mm/min**.

Here are the details of my setup:
- **Ballscrew pitch**: 5 mm/rev
- **Steps per revolution**: 4000
- **Controller setting**: 400,000 steps/sec

Based on my calculations:
- 1200 mm/min = **20 mm/sec**
- 20 mm/sec / **5 mm per rev** = **4 rev/sec**
- **4 * 4000 steps = 16,000 steps/sec**

This is far below the 400,000 steps/sec limit, so I don't understand why I can't set a higher speed.

Does anyone have an idea what I might be doing wrong?

Thanks in advance!

Hello there,
To help us get a little more info on your system please post a fresh report.zip and any schematics or manuals you're using.

I think the settings regarding steps/revs and the overall turn ratio are fine. When I move the axis by 5mm, the drive completes one full revolution.

Would you be able to try this on our newest version of CNC12? v5.30
In 5.26 there was a bug where for metric systems the axis max rate was being calculated for imperial units:
viewtopic.php?f=60&t=11141&p=97639&hili ... .26#p97639

Yes this is solved in 5.30

I recommend anyway to start with the latest version software.

Uwe

quick update – the issue was actually caused by the software version!
now everything is working perfectly.

Thanks a lot for your help !