Curved keyway pocket in round part

[drussell]

I have a problem determining how to create this pocket in a round part. Thekey to this pocket is that the center of pattern is perpendicular to the centeraxis like a mill will cut using a rotational axis. I have tried doing it withmultiple planes but that is a lot of work and did not work. The closest I havecome is 3D sketch with spines and sweep but is still looses the perpendicularaspect of the pocket.

Any Ideas would greatly help.

Thanks

Don

[JD Mather]

Sweep with Guide Surface to keep perpendicular.

If you can't figure it out - zip and attach what you have completed so far.

[drussell]

I have not been able to make the sweep and maintain the curved radiuses that the tool would produce. So I have done it with extrusions and sweeps. However the last sweep is will not work. It indicates it can not trim and discard faces.

It seems like there should be an easier way.

 

Don

FG5564.ipt

[kencaz]

Try using the Emboss feature to wrap the sketch around the cylinder. then Engrave.

 

 

KC

[JD Mather]

I haven't had time to do the example, but if you use this emboss method and then put in an assembly with a pin - do they intersect?

As I recall the emboss gets smaller going towards the center - and therefore doesn't work.

 

Sweep with Guide Surface and a couple of fillet is the solution AFAIK in 2010 or later.

In versions before sweep with guide surface see this tutorial http://home.pct.edu/~jmather/content/DSG322/Inventor%20Tutorials/Inventor%2011%20Tutorial%2011.pdf

[drussell]

I tried the emboss earlier because I thought it would work but I found that the angle of the walls were incorrect. So if it does taper that would make sense.

 

I am using version 2012 and it does have the sweep with guide surface and I used it for the first cut however the second cut, which already has the sketch and path ready in the model, has problems trimming faces. As a side note the only reason I am using multiple cuts is to keep the tool radiuses.

 

Don