Sinusoidal Cut Path on Surface of Cylinder

[sinusoid16]

Using intersection curve, I have produced a sinusoidal path on the surface of
a cylinder and using sweep cut, I was able to cut a rectangular channel
along the path.
The problem I am having is that the channel does not have a constant width
because the rectangular sketch I am using as a profile to cut with seems to
traverse and slide laterally as it follows the cut path, instead of turning to
always stay normal to the path and create equal width channel. I have tried
multiple combinations of guide curves and swept cut options with no luck.
A picture of the situation is attached.
Help is appreciated!

 

[sinusoid16]

We are performing this exact mating procedure and using the same types of mates. The problem lies in the fact that the "FACE @ BOTTOM OF CUT" is not continuous and niether is the "SIDE FACE OF CUT"

Maybe this picture will help make things easier to understand...

Notice that I can select the face at bottom of cut for one portion of the channel but I cannot select all of them in one click to make the mating happen for the entire channel.

 

[williedawg]

I played around with this for quite some time and cannot get "wrap" or some other method of placing the curve/cut on the cylindrical surface to work (except for what I've explained earlier)

And again, I'm in SW2006, so I don't have some of the newer methods.

Using "wrap", I could get the Bottom of the cut as one continuous surface and was able to Mate with the Origin of the cam-follower or "pin", but not the side surfaces to the Side Face of the "pin". I made the length of the Sketch 3*Pi (for a 3"dia cylinder) using a formula in the Dimension box, and rechecked for Tangencies, etc, but still SW made the sides in 3 pieces, which I could not find a way to make as one (??)

http://my.engineering.com/pg/file/williedawg/read/194631/wrapcut-cylinder

 

[williedawg]

try again..

 

[sinusoid16]

Thanks for playing around with this.

One of the things I have been trying is to merge the ends of the different sinusoidal equation sections but for some reason SW won't allow this and an error box appears simply saying "Cannot merge points" so that's not much help.

Anyone have more advice on why the wrap function treats these sketches like it is doing?

 

[rollupswx]

I'm in SW2006, so I don't have some of the newer methods.

http://home.pct.edu/~jmather/content/DSG322/SolidWorks Tutorials/SolidWorks Tutorial 11.pdf

 

[williedawg]

After some more tweaking and experimentation, I got those pesky transition lines out of the Wrap curve cut.

While in the Sketch, Tools>Spline>FitSpline was used to combine the segments that make up the seperate sides of what will be the Cut. Then when the Sketch was Wrapped around the cylinder, and an Assembly made, the sides were now un-interrupted and the "Pin" side Face can be Mated Tangent to one or the other sides.

This all looked nice, until I rotated the cylinder about the main Axis. The Pin wobbled from left to right as the cylinder rotated.

The only conclusion that I can come to, is that the Wrap is not the thing to use; as that even tho the Sketch was constructed of Spline and then a .500 parallel offset which was also Splined, the resultant slot doesn't allow the Pin centerline to remain vertical.
For example, if the cylinder were rotated 26deg, the top of the Pin would end up being at an angle of 2.63deg with the Top Plane, and more than 10deg at the worst.

 

[williedawg]

here is the Assembly showing that the Side surfaces are as one because of the SplinedFits in the Sketch

 

[williedawg]

here is the Assembly with the cylinder rotated to 26, and a Measureme between the top of the Pin and the Top Plane

 

[williedawg]

(hope I'm not boring everyone.....)

and here's the Assembly looking down on the Pin when the cylinder had been rotated 30deg CW which makes it evident that the top of the Pin is not lined up with the Top Plane in the Assem

 

[williedawg]

rollupswx
Thanks for the link.
The Cylindrical Cam tutorial was helpful and resulted in a "cut" that did not cause the axis of the "Pin" to deviate from vertical as was the case with the offset/Wrapped curve.

However, applying the appropiate Mates and then making the Tangent Mate between the Side Surface of the "Pin" and the SideSurface of the Cam, the Cam can only rotate 180deg; there is still the problem of the Surface not being one....even the tutorial shows these lines.