Re: [CAD_CAM_EDM_DRO] how to safely stall a DC motor

Les Newell wrote:

>Hi Jon,
>
>The motor stays stalled. This provides a preload on the ratchet to help
>prevent the tool moving. As the current through the motor is limited by
>a resistor, the motor is not harmed by this treatment. On the two
>toolchangers I worked on, the motors were only slightly warm to the touch.
>
>

Interesting concept. But, if it was designed for it, it should be
fine. I suppose the
worm drive is part of the scheme, as high ratio worms strongly resist
back-driving.

Jon