Hello,

Now looking at the backlash on the Y axis. I ran the G-cpde below (also attached) on my small mill. Basically it mills from x=0 to x= 10 mm line in MDF, goes up 150mm, mill a parellel line... comes back and does a line at x=10 to x=20... etc.

Issues are: at Y=0 the three lines are not completely aligned, there is a bit of "ladder" effect. Same with the lines at Y=150 mm

The distance between the lines at Y=0 and the lines at Y=150 is not truly 150mm - more like 148.5

these problems looked even worse when I tried to mill then drill a PCB

Shall I fix this by trying to removed the backlash "mechanically", or should I try to use Backlash correction in Mach3 (as suggested by Hood)?

-to check reliability, is the program attached/below the right way to go? I made a couple of circles as well - but I don't have high precision instruments to measure the distances accurately (electronic vernier calipers is all I have)

many thanks

Thomas

F100

G21

G01 Z2

G01 Z-0.5

G01 X10

G01 Z2

G01 X0

G0 Y150

G01 z-0.5

G01 X10

G01 Z3

G0 Y0

G01 Z-0.5

G01 X20

G01 Z2

G0 Y150

G0 X10

G01 z-0.5

G01 X20

G01 Z3

G0 Y0

G01 Z-0.5

G01 X30

G01 Z2

G0 Y150

G0 X20

G01 z-0.5

G01 X30

G01 Z3

G0 Y0