The proliferation of new applications for power-off brakes demands fresh design approaches leveraging leading brake manufacturers’ accumulated design experience. Key to optimizing designs for life, cost, and performance is early collaboration with the brake manufacturer. By Brian Mather • Ogura Industrial Corp. Machine designers in the motion-control industry recognize power-off brakes by the following terms: […]
Mechanical PT
Bush and shaft assemblies feature 4-micron clearance
NB Corporation’s FIT Series of slide bush and shaft assemblies optimize clearance between shaft and bush by offering clearances of 4 microns. Shaft end placement deviation is reduced 70% from the standard 0.046 mm when compared with the FIT Series which is only 0.011 mm. Because NB achieves a perfect fit, designers can take advantage […]
New gearboxes for electric motors in mobile machines
As part of its new, extensive eLION platform for the electrification of mobile working machines, Bosch Rexroth has developed spur gearboxes which vehicle manufacturers can use to unlock the full potential of new electric motors. The 1-speed spur gearbox (eGFZ 9100) and the 2-speed shift gearbox (eGFZ 9200) are installed in the central section of […]
Leading motion-control and actuation options for robotics
Advanced robotics for industrial and consumer applications demand sophisticated power-dense motion components for joints and linkages that must run smoothly, often at high torque and relatively low speed. The challenge is compounded when the robotic application must also make precise moves. At the core of most leading robotic-actuator options are electric motors. That’s because motor-driven designs […]
Basics of wave and cycloidal gearing for robotics and servo designs
Many of today’s precision applications necessitate gears capable of dramatic speed reductions, power densities, and transmission accuracies. Leading choices in these designs include trochoidal and cycloidal gearing as well as gearsets relying on wave-inducing subcomponents having an elliptical or Reuleaux or other polygonal shape. Trochoidal and cycloidal gearing includes elements that rotate and trace curves around […]
New plastic bevel gears from igus offer lubrication-free motion
igus has expanded its gear offering with bevel gears made of its iguform S270 and igutek P360 high-performance plastics. These abrasion-resistant, self-lubricating gears are a lightweight and maintenance-free alternative to traditional metallic gears. Gears are widely used as drive elements in a range of applications, from e-bikes to locking systems to actuators. However, when forces […]
How to calculate retaining ring maximum speed (rpm), and when it matters
Selecting an appropriate retaining ring for an application typically involves evaluating factors such as installation stress, the radial load exerted by the ring, and the thrust capacity of the ring. And because the groove that holds the ring is integral to the ring’s performance, groove deformation needs to be considered as well. But when an external […]
Motion system design: How to manage inertia mismatch
One of the most important parameters when sizing a motion system is the inertia of the load being moved. Regardless of the type of motor being used — AC induction, stepper, brushless DC, or AC servo — the ratio of the load inertia to the motor inertia has an important influence on system performance. If the […]
Vibration isolation technique supports spacecraft ground testing
Negative-Stiffness vibration isolation has played an integral role in supporting systems for ground testing and development of spacecraft and components, both inside and outside of vacuum chambers. Steve Varma Operations Manager Minus K Technology Spacecraft ground testing is sensitive to the smallest vibrations, can be caused by a multitude of factors. Every structure is transmitting vibrations from […]
What determines worm gear efficiency, and is it really that low?
Worm gears are often used for their ability to provide very high reduction ratios (and high torque multiplication) in a compact, single-stage design. But traditional thinking says that these benefits come at the expense of efficiency. Here, we’ll look at the factors that determine worm gear efficiency and how to get the benefits they provide […]
