I posted this on the yahoo group but figured I would try here as well.
I need some help. I built a JGRO wood router and am playing around with it
using Mach3 Mill. I am having a problem where the stepper motors are having a
slight hesitation between each line of g-code. It does not matter if it is a
circle or a straight line. If I write code for two straight lines connected to
each other I get a slight pause inbetween each line when I run the code. I have
tried it both with CV on and with exact stop on. It didn't make a difference.
I have backlash set to zero so I know it isn't a compensation issue. It is
almost like the computer takes a break from sending the pulses to the parallel
port each time the screen updates to the next line of code. The final dimensons
come out ok so I know it isn't actually loosing steps, it just makes the machine
run very jerky. I don't know if it matters but here are the details of my
setup.
Probotix bi-polar drivers with the non-isolated breakout board
256 oz/in powermax II bi-polar motors
1/2-10 acme threaded rod with dumpster anti-backlash nuts and lovejoy's
motor tuning 2000, 70ipm, accel 4, pulse width 2 - no microstepping
The program was drawn in autocad and cut2d was used as the cam program
Cutting at 35ipm and .200 depth per cut in mdf
Everything seems find with the setup except for the pauses between lines of
code. The machine jogs, rapids, and moves using MDI with no problems.
Any suggestions?
Keith