Bigger balls raise screw capacity
A
Steinmeyer UK product story
Edited by the Engineeringtalk editorial team
Jun 3, 2004
New from Steinmeyer at IMTS in Chicago this September will be a line of ground ball screws with very high load carrying capacity, some with dynamic ratings up to 1MN.
New from Steinmeyer at IMTS in Chicago this September will be a line of ground ball screws with very high load carrying capacity, some with dynamic ratings up to 1MN.
The new UltraThrust series is specifically designed for use in very large transfer line modules or to replace hydraulic drives in injection mould machines, for example.
By using massive 15mm diameter load carrying balls, Steinmeyer now provides more than twice the capacity of conventional ball screws.
As an example, consider Steinmeyer's new UltraThrust 63 x 20mm (diameter x pitch) ball screw.
It has a dynamic capacity of 430kN, compared with 179kN for the company's standard series 1416 ball nut which uses 11mm balls.
UltraThrust is initially offered in six sizes - all using large 15mm balls - 50 x 20, 63 x 20, 63 x 30, 80 x 20, 80 x 40 and 100 x 20mm.
And, a few of these sizes even conform to DIN69051, allowing for easy interchangeability in existing designs.
Precision ground ball screws offer a number benefits when compared with hydraulic drives: higher efficiency; reduced maintenance; higher speed rating; and improved speed and position control.
Ball screw load rating is determined primarily by the number of load carrying balls and their size.
Other factors include contact angle and track conformity, but these are limited by design rules.
The number of balls can be increased by adding more circles - but only to a certain degree due to grinding constraints as nut length grows.
So, to significantly increase capacity, the ball size must be increased.
Larger balls put greater demands on the ball return system, yet speed ratings should remain high in order to meet the demands of machine designers.
Steinmeyer was able to use its production proven high-speed line of ball nuts, the UltraSpeed series with dn values up to 160,000, as a basis for the development of UltraThrust.
According to Alex Beck, President of Steinmeyer: "Our new UltraThrust line is a cleaner drive alternative compared with messy hydraulics".
"By combining the high efficiency of a ball screw together with a high load bearing nut design we have also succeeded in providing design engineers with a cost effective alternative to large roller screws".
"And we have further expanded the line by recently designing a rugged compact ball nut using massive 19mm balls to achieve a previously unheard of dynamic capacity of 1MN".
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