Help designing bearing influenced by spring

[Haim1404]

Yes it kinda the same.
but now I return to my original question - how to design / determine the size and shape of the Cam so it will make only 90°

 

[CWatters]

I had a play around using sketchup to try draw Baluncore's proposal...

I'm no expert on Sketchup but I was able to produce this in about 30mins using the "Curve Maker" extension from the Extension Warehouse to draw an Archimedes spiral. I'm not suggesting you use this drawing but it's one way to approach it.

The 100mm long output arm rotates through a 90 degree arc. I offset the centre of the cam by 50mm along the 45 degree diagonal. Cant really justify this layout technically other than it looks about right and I think the forces on the cam follower should be reasonably uniform with this general layout? Although perhaps not optimal.

I've not allowed for the diameter of the cam follower wheel. The spiral is also over 360 degrees not the 270 degrees as requested.

 

[Haim1404]

Well guys thanks for all your suggestions and ideas.
I will keep you updated.

 

[JBA]

During my period of being a product development engineer the company had us attend a seminar on creativity and problem solving; and, although I remember little of that seminar, one statement has always stayed with me and that statement was " When brain storming for a solution to a problem you not through until you have visualized at least eight ways to solve it, even if some of them are not practical or possible they will open up your mind to possible routes to a solution"