Variable pitch scroll

[AndyIR]

I'm trying to draw a variable pitch scroll that will transfer product (cylindrical vials of diameter 25mm and height 50mm) to set positions to be picked and placed. The product will be fed into the scroll and will be transported between a fixed rail and the scroll. On the attached drawing you can see the 9 pitch positions where the product is required to be at (the nine 28.5mm dia dimensions).

I'm not happy with the way I've drawn it. In my head I want to use the product as a cutting piece so during manufacture the cutting piece would move 55mm in the x direction in the same time that the scroll is turned one full revolution. That would be for the first pitch position. For the 2nd pitch position the cutting piece would move 40mm in x direction for one full revolution and so on.

Would much appreciate any guidance at all with this. Sorry if the above is a bit messy, if it's sounds incomprehensible let me know and I'll attempt to reword!
Cheers

 

[handleman]

This is essentially a barrel cam. There's really no point in accurately modeling it unless you are going to RP it. Even if you created the geometry accurately, I don't think a CAM package will accurately interpret it as a 4-axis milled part. However, if you really want to see accurate geometry you will need to do a solid sweep. The sample in the help file actually illustrates exactly what you are wanting to do. The finished model will certainly look a lot different from what you've modeled here.

What you really need to manufacture it is a graph of axial displacement vs. degrees of rotation for the full length of the cam along with the cutter diameter and its distance from the axis. A cam manufacturer can take it from there.

-handleman, CSWP (The new, easy test)