Need a ME for a rack and pinion design, what should they do exactly for the job and what info do I need to provide?

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I need a ME to design a rack and pinion system where both gears are plastic (type chosen through discussion) and rather small (5mm diameter for the pinion and 6mm length for the rack). The rack is moved by a spring loaded button press and the goal is to rotate an axle the pinion is attached to for X degrees.

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I don't know what specs/requirements need to be provided to the ME for this job nor do I know what simulations I need to ask a ME to perform other than providing CAD drawings to verify the design will work (low likelyhood of physical damage from stress, durability to ensure long-lasting operation, amount of expected backlash, etc)

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