[Bob La Londe]

Adding a stepper or servo is no big deal either. I've got lots of fractional horsepower DC brush motors laying around and a few spare steppers. I am certainly curios about what you did there. Controlling the motor is of course no big deal, but I don't have a mental picture of how you are using it to secure/release your tool holders.

[SCzEngrgGroup]

Adding a stepper or servo is no big deal either. I've got lots of fractional horsepower DC brush motors laying around and a few spare steppers. I am certainly curios about what you did there. Controlling the motor is of course no big deal, but I don't have a mental picture of how you are using it to secure/release your tool holders.

Bob,

Like I said, it's effectively an electric torque wrench, turning the stock drawbar. Control current to control torque.

Regards,
Ray L.

[Bob La Londe]

Bob,

Like I said, it's effectively an electric torque wrench, turning the stock drawbar. Control current to control torque.

Regards,
Ray L.

That's what I was afraid you were saying. So, how do you go about engaging and disengaging it then? The same way as the butterfly impact? By sliding it up and down to the nut? Yuck. Also, if you are effectively just running an electric wrench how are you locking the spindle? I must be missing something there.