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I can't use a ball screw because two or more pieces must be engaged to the cylinder cam at the same time, and each one must have different speed. If someone as an idea to met these requirimet, I have my mind open.

The screw doesn't stop (unless the machine stops). It is always rotating at constant speed. The follower returns by other way, not using the cam.

Hello everybody, I'm a R&D mechanical engineer and I must design a cylindrical cam with a variable pitch helix machined on it, in order to get a linear accelerated movement with a constant rotational speed. I'm thinking about a two meters length shaft with 150 mm of diameter. The...