A: There are many factors that must be taken into account when sizing a Wiesel linear actuator. For example, with a ball screw or belt system we have to take into consideration the feed forces the unit will see. This can be due to acceleration of a mass or some force like cutting or pulling. Since most Wiesel actuators have integrated linear bearings we also need to look at the factors that effect the bearings. Where is the load relative to the carriage? How big is the load? Are there any "off axis" forces? As you can see, all these separate factors can make selection difficult. Fortunately we have a software package available to help in the selection of a Wiesel product called Wiesel Manager. You can request it in the "More Info/Catalogs" section of our web site. Alternatively you can give us a call at (888) 324-0858 and we can walk you through the application.

Q: How do I size a ball screw drive?

A: There are several criteria that must be considered in the proper selection of this product including peak and continuous forces, velocities, life, duty cycle, acceptable error and backlash, mounting configuration, etc. Precision Technology has on staff product and application engineers that can assist with your need. Please call us at (888) 324-0858. We can help you with your application and send a comprehensive catalog.

Q: Why would I need a Spiracon® planetary roller screw?

A: When compared to ball screws Spiracon® roller screws have much higher load ratings. Load ratings are typically 3 to 4 times higher and therefore offer a much longer life span. They can survive very harsh environments and are perfect for mission critical components.
When compared to hydraulics they offer a safer, quieter, and cleaner alternative. They also provide higher system efficiency and only draw power while in motion so the cost of ownership is lower.

Q: How do I size a screw jack?

A: Screw jacks are intended solely for providing a force in one direction. Because of that they are relatively easy to apply. Each model has a tonnage rating. Select your model based on your force requirement. For longer strokes we need to consider buckling and whipping of the screw.

Screw jacks are often used in sets of two or four. In combination with a PT spiral bevel gearbox all screw jacks can be driven by one motor. PT also supplies couplings and line shafts for connecting it all together.

Lead screw jacks are rated for about 30% duty cycle. If we need higher duty cycles we move to the ball screw jack line. We have an extensive catalog covering our wide range of screw jacks. You can request it via this web site or call us at (888) 324-0858.