4/5 axis machining inside a tapered cylinder - Tool will not stay perpendicular to wall

[dillmanb]

Hello,

i am trying to machine the inside of a tapered cylinder using milling toolpasses. The part has veins as shown in the picture.

I want to create a toolpath where the mill is always perpendicular or mostly perpendicular to the wall (+- 10°). Currently I am using a Multi Axis Finishing pass. When I adjust the settings for tilt or lead angle, fusion is not able to produce a toolpath anymore. Using Multi Axis Finishing, Fusion always tilts the tool the deeper the machine moves in the taper. The yellow lines in the screenshow correspond to the tilt of the tool. As the tool starts on the top, it is almost perpendicular to the part, but gets steeper the further it moves inside.

My machine has 5 axis, four of them are on the head, meaning the head does the X/Y/C/B movement. The table is the Z-Axis.  There is plenty of clearance for the head and tool.

How can I create toolpasses where the machine does not tilt the tool to such extreme angles?

[craig.chester]

I figure that I may be misunderstanding something fundamental here.... I assume that wall is close 360 degrees, rather than the sectional view showing only half the cone.

If the tool-axis was perpendicular to the inside of the cone, The machine would be crashing into the other side of the cone? That is unless the head of the machine can get inside that cone?

Fusion assumes the tool length is infinite, hence why it tilts more towards the bottom in order to avoid crashing into the opposite wall.

Is this a milling application?

[dillmanb]

Hello Craig,

yes the part is a full 360 degree cone, i just showed the section view to make it easier to understand the part.

No, the head is thin enough to have plenty of clearance (100+ mm) to all sides of the part even if its all the way down in the part.

Yes this is a milling application. I know the part looks like it is meant to be manufactured on a lathe but milling is the only option here.

Why would fusion assume an infinite tool length? I specified the tool as an endmill with defined lengths?