ATC module for ER20 spindles

[magicniner]

Thanks for the extra information Daz. If the motor could generate the torque it would need a very different controller, the current one is KBE thermistor type. Something that would generate stall current at low volts would be needed, and anyway as it's a PM motor it might be field limited. Also the height would severely restrict me and my table is only 125mm wide! Shame it's a very nice concept.

The whole point of an Impact Driver Mechanism is that it isn't reliant on motor torque, it releases the drive in response to pre-settable torque demand, allowing the spindle to accelerate, it then uses spindle system angular momentum against a braking mass to apply the required torque, repeatedly.