Bug: Cutting into models while combined4axis CNC carving

[ElDudinero]

🐞 4-Axis linked CNC: Parts of the model are sliced off

Affected Version(s)

The issue is caused by version 4.10.2

Is this a regression? (optional)

This bug is not new.

To Reproduce

Steps to reproduce the behavior:

1. load a STL which has overhanging Parts in the lateral (Y) dimension for example:
   https://www.myminifactory.com/object/3d-print-recumbent-lion-107911

2. Use the 4-Axis CNC mode with the following parameters:
   Previev only
   Straight groove-VBit (original V-shaped, cutting radius 0.3mm, Angle 20deg, shank diameter 3.175mm)
   Jogspeed 1500,
   Working speed 400mm
   Plunge 400mm
   Stepdown 10mm,
   "Umstieg" 0.12mm. (very soft pinewood so it does a clean cut.)
   Method: 4 Axis connected (since the model does have gooves)
   Alllowance 0mm (one pass)
   Jog-height: 1mm (This may - but should not cause the collision with the model)
   Locating height: 80mm

3.Generate and send G_code to SM2 350

4. Use the assistant to detrmine the startingpoint.

5. Start milling.

A clear and concise description of the problem...

1. The bit cuts deep into the model where it should not whenever there are overhanging parts.
   Thesis1: The Jog-height is calculated incorrect in relation to the models surface.
   Thesis2: The G-Code does not calculate the diameter of the bit when drilling the next slices,
   resulting in cutting off of overhanging parts of preceeding slices.
   Thesis3: Any errror in the model causes the G-Code to carve out points acually inside the model. (I checked the model though)

2. The collet can collide with the surface of the material.
   Solution: the maximal available length of the bit from tip to the shank should be measured and taken in consideration.
   Workaround: Use smalller raw material.

3. The bit may in some cases drill deeper in the material than its cutting parts length resulting in a blockade of the Z-Axis.
   Solution: The maximal length (plunge) of the bit could be entered in the Bit-configuration.
   Workaround: Enter the maximal plunge-depth according to the bits working parts length.

1. Carving without going deeper than the models surface.
2. Avoidance of collision of the collet with the surface of the raw material while plunging.
3. Plunging just as deep as the tool is able to acually carve.

🌍 Your Environment

Platform:

- Operating System: [Windows 10 x64]
- Printer: [Snapmaker 2.0 A350, Controller: V4.6.5, Firmware Snapmaker2-V1.18.2_20240116 rotary module]