This simple screw jack is based around a bench-mounted base incorporating a turntable fitted with a metric square pitch screw jack thread. The apparatus is stood on a firm bench and a cord is
wound around the periphery of the turntable. The free end of the cord is threaded over a pulley and then hangs vertically to accept the load hanger supplied. A set of calibrated weights is supplied which are suspended from the load hanger thus producing a known torque on the system. To adjust the experimental parameters further the calibrated weights can also be applied to the top surface of the turntable. A comprehensive instruction manual for lecturer and student, giving full details on apparatus assembly and operation as well as example results. All necessary assembly and operational tools are provided.
Experiments
- Efficiency of screw thread.
- Mechanical advantage.
- Determination of the friction loss.
- Comparison of lubricated and un-lubricated screw threads.
- Comparison of actual results with theoretical.
- Determination of velocity ratio.
Specifications
- Approximately Ø250mm turntable
- 20mm outside dia meter thread
- 5mm thread pitch
- The effort can be applied to raise or lower the load
- Set of weights
- Comprehensive instruction manual provided
