Other manufacturer's linear ball screws and ball screw nuts are available on request these include, Rexroth / Star / Korta / Warner / Rockford.
Most ball screw products are available 'off the shelf' and end journals can be machined in our workshop. End support bearings and bearing units are also available.
In a service or breakdown situation some ball screws and ball screw nuts(depending on degree of damage) can be refurbished in our workshop. This allows the machine to continue operating until a new ball screw is purchased.
Ball screws are used in a wide variety of applications, ranging from low accuracy transport grade to extemely high accuracy precision grade screws. The principal features distinguishing different ranges are:
1. Lead accuracy - the degree to which rotational movements of the shaft are translated into exactly proportional linear movement of the run. Available lead accuracies are designated T7 and T10 in accordance wtih ISO3408, DIN69051 and JISI1192.
2. Axial play and preload - the degree to which a ball nut may be moved in the direction of the axis of the screw without any rotation of either screw or nut. Preload may be regarded as negative axial play, although in practice it is measured as drag torque - the torque required to rotate one memeber relative to the other in the absence of any other applied load.
3. Life/load relationship - this is defined by reference to the Basic Dynamic Load Rating, which is the average axial load over the ball screw's duty cycle which gives a projected life of 106 revolutions.
Lead accuracy and axial play are determined mainly by the method of manufacture of the ball screw shaft - in general, high lead accuracy and zero/negative axial play is associated with precision ground ball screws and relatively higher cost. Low lead accuracy and positive axial play is associated with low cost rolled ball screws.
Basic Dynamic Load Rating is determined mainly by the nut curcuitry i.e. shaft diameter, number of balls, size of balls and type of recirculation etc., and and so high life units can be produced in both rolled and ground versions.
The range extends from lower cost rolled products suitable for low precision actuation up to the highest levels of precision required for high accuracy positioning requirements such as those for machine tools.