2D adaptive toolpath problem with tapered mill tool

[jari.peltola]

I'm using a small tapered mill tool to cut 2D adaptive toolpath. 2D adaptive does not cut to the pocket edges if my stock offset in Z-direction is greater than zero (naturally it gets faced off first). Result is same if I had "radial stock to leave" in the tool path. If I set stock and model tops to same height there is no problem. Also if I change the tool taper to a very small value (0.1 degr) the problem goes away.

It looks like that 2D adaptive is calculated as the pocket outer edge would be on the stock top. And because the tool is tapered the actual pocket (on the model top level, or little below) is leaved smaller than it should. If I increase the Z-stock-offset then the pocket gets even smaller.

I am doing a small logo carving toolpath, my carving tool tip width is 0.2mm and taper 15 degrees. The pocket depth (of the logo) is 0.1mm.

This is very easy to reproduce:
- Draw a small circle (eg. 13mm or 1/2inch), extrude it to a shallow pocket (eg. 1.5mm or 1/16inch).
- Create a tapered mill tool (e.g 15 degr)
- Create 2D adaptive toolpath to cut the pocket (no Z-offset on the stock)
- Simulate and everything is fine so far
- Next add Z-offset to the stock (e.g 3mm or 1/8inch) and create a face toolpath for it
- Simulate, now the cut pocket (2D adaptive) diameter is smaller

Br. Jari

[HughesTooling]

Export the f3d file with the setup and ops and attach here.

Mark

[jari.peltola]

Ok. In the attched file there is a simple test part with shallow circular pocket on the top side.

There are two CAM setups:

- Setup1_noFacing, which has no extra material on top and no facing, 2DAdaptive works fine

- Setup2_facing_first, which has 3mm extra stock on top which is first faced before 2DAdaptive, now the circle is not machined to the circle edge but is left smaller than in the first case.

Jari

[HughesTooling]

@seth.madore  Any ideas on this? I've played around setting the top and bottom height in different ways but the toolpath always seems to offset from stock top.

Mark

[seth.madore]

This is an interesting issue. I'm going to log it as a defect. I'll circle back once I have more info

This is logged as CAM-15656

[jari.peltola]

Any new info about this defect?

F360 seems still to behave the same way.

Br. Jari