rscrawford wrote:Probably backlash, and only happens after a longer Z movement (where it has longer to accelerate and actually gets up to a higher speed).
Another possibility is with longer Z plunges, there is more lifting force with an upcut spiral ballnose bit, and the wood can be moving slightly upwards, giving a deeper cut at the bottom of the plunge.
The shadow is actually about 0.01 - 0.015 higher than the model specifies. The shadow is also smooth which indicates that the tool is lifting up before it get to the "cliff" as well as not fully dropping off coming off the "cliff'. And again, why only on the right hand side?
- checking the spindle/router for plumb/square
- resurfacing the spoilboard
YouTube videos are available on both topics.
Also check your material holding and material movement. When a lot of wood is removed the boards tend to cup, twist, or bow.
The stock is being clamped down on all four corners to a Blanchard ground aluminum tooling plate. The spindle trams to within .006 TIR on a 8 inch sweep last time I checked it. If the wood is moving after it is relieved then again, I'd expect the issue to seen throughout.
This occurs quite often on a number of my projects and it is always the same; just on the right hand side.