What is your plunge rate between passes?
There are several reasons for each pass being off
1. Plunge rate being too fast. Although I cut at 40"/min I plunge at 6"/min even
though my Z-axis is reinforced.
2. Your Z axis runners may not be tight against the pipe all through the plunge.
3. The bit should be sharp. Pine is a strange wood with those alternating hard
and soft bands which tend to show up any flexing in the JGRO when cutting it.
I an not sure about your TCNC settings as I use Mach3.
Jason |