@deckingman
I am using LDO-42STH48-2504AC which can be run with 2.5 A. However I run them with 0.9 A (because they are quieter), 24 V and a 20 teeth pulley.
These are able to accelerate my 1.5 kg gantry to 600 mm/s with an acceleration of 8000 mm/s2 (Y direction). At 10000 mm/s2 I am loosing steps.
Diagonal I only tried 600 mm/s with 5000 mm/s2 (which worked, by setting the speed limit high enough).

Most other steppers are not able to reach this speed due to higher inductance and resistance. Meanwhile LDO brought the 2804 which are capable of even more acceleration and speed.
https://youtu.be/szJ_krWbRaQ

@mikeabuilder
My move is long enough according to the prusa/reprap calculator. With 8000 mm/s2 the 600 mm/s are reached after about 15 mm and I am moving 266 mm.

@deckingman
Ok, thanks for the detailed explanation. That makes sense. So it means that the DWC does not show the tool head speed, but instead shows the speed of the fastest moving axis (If I move at a different angle than 45 degrees, the displayed speed is higher). So from functional point everything should be fine, only the display is not as expected (by me).

Is it possible to adapt/configure the DWC so that it shows the tool head speed? Finally that is the more interesting part during a print.

Sorry in case there is already a thread like this, but I do not know what exactly I should search for.

In my config.g I have set M203 X30000 Y30000.
In case I am at X0 Y0 and type “G1 X266 F30000” DWC will show 500mm/s for the move. Same if I type “G1 Y266 F30000”.
However if I type “G1 X266 Y266 F30000” DWC does only show about 353 mm/s as requested and top movement speed.
M201 is set to both 5000, so the speed should be reachable.
In case I Set M203 to 180000, then F30000 does result in 500 mm/s for diagonal moves too.

Is this the expected behaviour? Does M203 limit the engine RPM instead of the tool head moving speed?

Ok thank you all. Then I may just flip it by 90 degrees and mount it to the side of the PSU. Due to the PanelDue the enclosure has some space available there anyway.

In the documentation the chapter about cooling of the Duet 3 6HC does still contain „TO DO“.
I am currently using it with Nema17 motors were cooling should not be an issue. However since I start to like it more and more I am thinking about buying another bord for my CNC which uses Nema24 motors.
The 6HC bord is specified to support up to 4 A RMS and 6.3 A peak.
I am currently asking my self, at which current the drivers will need which kind of additional cooling?

Is it sufficient to blow with one 140x140 fan sideways to the 6HC bord or will there be any specific cooling required if the bord shall provide its maximum driver current on 4-5 drivers?

This is the setup I currently plan to build. I am not 100% sure if I will mount the main bord horizontal or vertical.