DM542A, Nema23, DB25-1205, Longsmotor

Thomas wrote: 2.) The stepper motors are hot after a few minutes. I can touch them only quickly, so i think they have around 140° / 60° F / C.

60°C is acceptable for a stepper motor.

www.longs-motor.com/product/nav_12_26.aspx

Quotes a temperature rise of 80°C and a max ambient of 50°C, which means (I think) that the motor is safe to 130°C.

@Rick G: thank you, I changed the settings of "Step Time / Space" to 5000 ns and "Direction Hold / Setup" to 10000 ns. Also I changed the DIP switches of the DM542A to 1 ON and 2-3 OFF (2.69 A/RMS; 3.76 A/Peak).

@andypugh: thank you too, then I'm reassured.

The weekend is coming, the cnc router works with a acceptable noise and the dust extraction is ready. Time to use the cnc router and work with it

Also look at Dip SW4 which controls "Stand still current setting"
Which allows for automatically reducing the current and as a result the heat while the motor is not moving.

Rick G