Tapered lands

[Anonymous]

Hi All,

Hope all is good with yous . I am having a bit of trouble figuring out how to complete some tapered lands on a face and also in the bore within Fusion 360. I think I may have tackled the face by using a coil of which I can use the milling cam to complete in straight line movements. The only thing is that the sample part I have looks as if it has been done on a lathe. I would find it interesting to see what your take on this would be.

I have a number of small parts of which we are trying to tackle. Not sure if you guys can take a look at the attached drawing and advise if what I need to do is achievable on a Doosan Puma 2600 with the turning function on Fusion.

What I am particularly interested in is the tapered lands on both the face x 6 and also x 3 in the bore. These are typically C/W or C/C/W rotation to suit pump and the tapers are there to create pressure wedges in the oil to produce lift in high speed machinery. The white metal lined one runs at around 28K revs.

This would mean on the face there would be 6 x movements in the z axis per revolution and in the bore 3 x movements in the x axis per revolution. (Not sure if this is possible on a Fanuc machine)

I hope that this can be done as it would save a load of secondary milling work.

[TrippyLighting]

I am not a machining/CAM expert But I'd have a hard time imagining that those are created on a lathe. @seth.madore may be able to direct this part of the question to the right folks/forum.

In terms of modeling I'd try a sweep with twist. It offers better control than the coil function, although that would also work. 

[davebYYPCU]

Modelling them, split face, draft, and circular pattern

Cam likely to be rotary table, with horizontal axis grinder.....

Might help...

[seth.madore]

Thanks for the tag Peter. I was going to reply yesterday, but got pulled away on some shop crisis or two.

Machining this, I'd likely go with a Parallel toolpath and decent size ball endmill. A fine stepover would get you something approximating a turned finish. You'd want to make some patch surfaces that extend beyond the lands so your tool can safely traverse perpendicular to the land without leaving trail marks