Screw jacks are just one member of the linear motion family, more suitable for relatively low duty cycles. A customer had a noise and wear problem we had to trouble shoot. It highlighted what not to do. There are two common types of screw jacks. Ball screw jacks have recirculating balls in the threads that reduce friction, and machine, or acme thread, screwjacks have a sliding action similar to a nut and bolt. Ball screws allow more duty cycle, machine screws allow less. Within these screw jack types there are two versions. What we call our standing version has the screw itself traveling through the body of the jack, without rotation. Our rotating version has a spinning spindle, or screw, that drives a nut along its length. A user customer of ours had a European designed machine with one o

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