em806 Senssorless Stall Protection fault

[m_c]

How do you know how to set the speeds of each motor to get the most with out problems?

Keep increasing the settings until the motors start stalling, then reduce them to create a bit of a safety margin.

You have to find a compromise between acceleration and max velocity though. With less acceleration you can ultimately get the motors to spin faster without stalling, however if you're planning on doing things that involve lots of small moves, then sacrificing top speed for acceleration, will often result in faster machining times.