option 3) differentiate the output from above with ddt and feed it to
the needle spindle as a velocity command. might be slightly less
accurate than 2 but you won't need to do silly hacks to prevent
counter overflow.
3A) differentiate the X and Y positions _before_ the hypot, then send
Dave Engvall wrote:
Think long arm sewing machine for quilting. The rotational axes are the
needle and the bobbin. The tracking give constant stitch length.
Two are X and Y and the other pair need to track (rotationally) with in
a few degrees or better. Rotational speeds are from zero to
Hi Ben,
Thanks for the ideas, option 3 makes the most sense to me and I guess
the best approach is to rig up a couple of servo motors and start
experimenting.
Dave
On Aug 24, 2007, at 3:38 AM, ben lipkowitz wrote:
Dave Engvall wrote:
Think long arm sewing machine for quilting. The
Hi all,
I have an application that needs (eventually) 4 axes.
Two are X and Y and the other pair need to track (rotationally) with
in a few degrees or better.
Rotational speeds are from zero to 1800 rpm for one axis and either
1:1 or 2:1 for the other.
The speed of rotation and the
