invalid exclude of pocket

[tcurdt]

If a tool is too big for a pocket operation, the operation is skipped.

But here the tool is 3.175mm and the hole to pocket is 3.3mm.

Yet, the operation is excluded. IMO that's a bug.

bug.kmz.zip

[stewartoallen]

this hole is highly faceted. the poly offsetting library concludes that it's zero in size when offset. reducing the tool diameter to 3.165 from 3.175 succeeds. I am making changes to allow offset polys close to 0 to work.

[tcurdt]

While any improvement is of course great, I think just reporting on the problem would go a long way.

As discussed on the chat, I can confirm a higher resolution includes the hole in the op, but it seems the offset is too small to spiral into.

[tcurdt]

I tried a bit more.

Even with much higher resolution the current dev version still fails to pocket a 3.2mm pocket with a 3.175mm endmill.

[stewartoallen]

in the clipper library, when the poly is offset inward, close points are collapsed. this may be tunable to some degree. but this outcome is not entirely surprising.

[tcurdt]

So IIUC it's the algo from clipper that optimizes away some points to calculate the area.
And the optimization leads to a simplification that leads to a smaller area and hence gets excluded.
Did I understand that correctly?

Any other strategy that could work?

[stewartoallen]

essentially. the right fix is updating the drill op. trace will have the same problems.