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

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.

Les

Jon Elson wrote:

>>
>>
>Yes, this should work fine. But, I think you need one more relay to turn it
>off. It doesn't really keep the motor stalled ALL the time, does it?
>Or, just
>long enough to get the tool firmly seated?
>
>Jon
>
>
>