So there is a piece I’m working on. 3/4 inch plywood
80mm x 300 mm rectangle with filleted corners.
5 x 39mm holes 14mm deep in the topside.
3 x 9.3mm holes in the centers of 3 of those larger holes.
If I save the CNC program and use a 1/8 flat nose endmill everything seems fine.
However, if I use a 1/4 endmill. All goes to hell.
With a 1/4 flat nose it cuts through my part to make those 3 smaller holes. And takes
longer to cut the part because its making these extra cuts. What do I do.
I literally pick the 5 larger holes one by one and choose a toolpath depth of 14mm. Toolpath: Hole with pocket strategy.
Then I chose the 3 smaller holes one by one and use a toolpath depth of 19.56mm Toolpath: Hole with pocket strategy.
Then Chose the outside of the part, cut at 19.56mm with three tabs. Toolpath: Part with 3 tabs.
When I add those second holes of 19.56mm depth inside the already 14mm deep pocket, does that 19.56mm start at the work piece topside
or 14mm below the work piece topside?
the issue is the small holes inside the larger ones.
They are defined as pocket but too small for a pocket with the larger tool.
I’ll try to detect this situation in future to avoid the issue - but the solution is to simply not make the small holes a pocket.
That is essentially what the helical drill does. The pocket operation wants to cut the inner perimeter and clear the central material. I hear what you are saying, but the software does not currently like that scenario. I generally use the helical drill for any holes that are less than or equal to 2x the bit diameter.
So… An all new issue. Everything still applies from above. I finally cut the part out. However on the parts tops edge there’s an issue. The first pass of cutting out the actual part cuts slightly into the part part of the way around it. It leaves a sort of step and its not all the way around it. Its not much, maybe a mm but its annoying and noticable. Any ideas?