Screw jack cast iron

Worm gear screw jacks with trapezoidal spindle

Worm gear screw jacks with trapezoidal spindle are primarily used when relatively slow axial speed is needed and/or when 
the compact design of the worm gearbox is of advantage. A standard worm gear screw jack with trapezoidal spindle ensures 
a tensile and compression force of up to 40,000 N and a linear speed of up to 2,800 mm/min.

Worm gear screw jacks with ball screw spindle
A worm gear screw jack with ball screw spindle provides advantages over the trapezoidal spindle in relation to efficiency, 
speed, precision and running time. 
By using a standard worm gear screw jack with ball screw spindle, you can achieve a linear speed of up to 25,000 mm/min. 
Since the ball screw has a very high efficiency, it will limit the accumulation of heat in the spindle and nut. That makes the 
ball screw suitable for continuous operation. 

Running-in and maintenance

Running-in: 
The lifetime of the gearbox is increased by careful running-in. The first running time should not exceed 30 minutes, and it is necessary to make time for cooling before the next start. When doing the first running-in, it is important to take the duty factor into consideration. The load of the gearbox is gradually increased from half to full output torque.

Maintenance of spindles: 
A certain time for running-in must be expected. It is recommended to protect the spindle with e.g a bellow (see illustration in the downloadable catalogue). Due to the generation of heat between spindle and nut, the gearboxes should not work continuously with heavy load. Also, it is important that spindles and nuts are kept clean and well-lubricated by using a quality spindle grease. All data are based on clean and well-lubricated spindles. With daily operations the spindle should be checked weekly and lubricated as required. With fewer running hours, monthly checks are sufficient.