Re: [CAD_CAM_EDM_DRO] Which Mode is Better TORQUE or VELOCITY?????????

Babar wrote:

>Hi All,
>
>I am using a Servo dynamics DC servo Drive, I am a bit
>confused about the mode of operation, there are two
>modes i.e Torque and Velocity, Can you people guide me
>which mode is better and what are the advantages and
>disadvantages of using each mode on a closed loop CNC
>
>

Does your machine have a DC tachometer to measure linear
velocity of the axes? If so, you really want to use them and
set the drive for velocity mode. This allows the machine (drive
to motor to axis) to move at the commanded velocity even between
the points where the CNC control measured position and calculates
a new velocity for the next servo cycle. It means the servo amp
is taking care of small, fast fluctuations in the movement due to
irregularities in the motor and vibration of the cutting tool hitting
the workpiece.

Torque mode is what you will HAVE to use if your machine does not
have a tachometer to measure speed. Velocity mode requires a
speed measurement so it can compare actual velocity to commanded
velocity.

Jon