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 troubleshoot. 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 cycles, and machine screws allow less. Within these screw jack types, there are two versions. What we call [...]