Converting a linear displacement to rotation


Thread Starter

David Cleeren


I need to convert a linear displacement of 700mm to a rotation with an accuracy of at least 0.1mm/Revolution. The linear movement has a maximum velocity of 40 mm/s. The rotation side is linked to a encoder wich has praticaly no mechanical resistance. Who has any experience with this subject. Wich mechanical equipment is best suited? A belt, bearing or spindle construction? Are there of the shelve solutions available?

Marc Sinclair

You have a Linear displacement, a movement in a single plane, in a straight line. for example a trolley running on a track. By fixing a rack to the trolley and engaging the teeth with the teeth of a gearwheel 222mm diameter, the gearwheel will turn (providing the axis is fixed and the rack is constrained to always engage the gearwheel) one revolution for 700mm of linear travel. The encoder could then be fitted to the gearwheel axis to provide positional information. It's a common industrial practice, and an even more common homework question :)

Marc Sinclair