Milling with low velocity

[floralisa]

Hello,

For milling tests we tried to use really slow velocity. Used Skeinforge milling and it seems that the velocity of our machine does not move slower than about 15mm/s (we did not measure it, but even if we set the velocity in Skeinforge to 08mm/s or after this 0.1mm/s (F6.0 in gcode), the machine moves with this speed ( about 15mm/s ).
Is there a feature in the marlin software to configure the low velocity? Is it a problem of acceleration?
We use gen6 electronics and printing and speed changing while printing in higher speed ranges is no problem.

thanks for your help,
regards,
floralisa

[daid]

Maybe it has to do with the "MINIMUM_PLANNER_SPEED" setting in Configuration_adv.h?

[ErikZalm]

Marlin is not optimized for very low speed. This would need some changes.
The absolute minimal microstep frequency is 120Hz.

[floralisa]

Thank you.
What is in the limiting factor? Depends this on the acceleration calculation?

[ErikZalm]

The limiting factor is the range of the integers. I optimized it for 3mm/s to 1000mm/s (for 40 and 80 microsteps/mm)
If your resolutions is higher the speed can be lower.

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