CNC Router Tips Podcast Episode 11:

How To Set Up Constant Velocity Mode in MACH3.
Q: Bill, I got a question about setting your Mach3 acceleration and Velocity setting in Mach3. Should I use Constant Velocity? I also wondered if the A axis and the Y axis settings have to be exactly the same?
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TERMS
Look ahead
Acceleration
Exact stop
Constant velocity
The lower the acceleration of the machine axis, the greater will be the radius of the rounded corner
How we do it:
In Mach3 you can set the velocity mode to either exact stop or Constant velocity. To do this go to General Configuration Logic the settings tab (page) and look for a button located above the Reset Button which says “Set Steps Per Unit”. Use this button to enter a distance to travel. Measure the actual distance traveled then enter the corrections.
Software:
If you would like to download a demo copy of Mach3, Check out this webpage. Go to http://www.themakersguide.com/machdemo