Dovetail slides are a type of plain linear bearing — along with boxway slides and plain bushings made of plastic, composite, or bronze — that rely on direct contact between sliding surfaces to support a load. These differ from modern rolling element linear bearings, which use balls or rollers to reduce friction between the load-bearing […]
Compact Linear Induction Motor from H2W Technologies
H2W engineers have developed a compact Linear Induction Motor (LMAA-04-01) that can generate 10.6 lbs (47 N) of force at a 15 percent duty cycle. Operating at 208 VAC 3-phase 60 Hz, the synchronous velocity of this LIM is 160 in/sec (4 m/s). The LMAA-04-01 linear induction motor was designed for high speed operation; however, […]
What are the benefits of a rotating ball nut (aka driven nut)?
When you think of a ball screw assembly, you probably envision a screw shaft with a motor connected to one end. The motor turns the screw, and the ball nut travels along the length of the screw shaft. An alternative setup is to hold the screw shaft stationary and rotate, or drive, the ball nut […]
Case-hardened tapped or threaded shafts, ready to ship
Made in the U.S.A., NB’s shafts are never annealed, so outer diameters are ultra precise — tolerances are always reliable. Tapped shafts can be ordered with one or both ends tapped, in either case-hardened carbon steel or stainless steel. Threaded shafts can be ordered with one or both ends threaded, in case-hardened carbon steel. Diameters […]
New Sealed Electronic Actuator Simplifies Upgrade from Mechanical Actuation
Southco, Inc., a global leader in engineered access solutions has added to its line of electronic actuators with a sealed version that simplifies the upgrade from mechanical to electronic actuation. Capable of accommodating higher mechanical loads, the AC-EM 10 electronic actuator facilitates the electronic actuation of Southco’s R4-10 rotary latch series and other latching mechanisms. […]
What’s the difference between dynamic load capacity and static load capacity?
Rolling element linear bearings, such as round shafts and bushings, profiled rail guides, crossed roller slides, and even ball screws, have two load capacity specifications — dynamic load capacity and static load capacity — which are based on different operating parameters and performance criteria and are independent of each other. To accurately size and select a […]
When should you use a ball spline?
A ball spline is a type of rolling bearing linear guide, similar to a round shaft and bushing assembly, but with a critical distinction in its operation. The shaft of a ball spline is much like a linear guide shaft, except that the spline shaft has grooves along its length. The spline nut (analogous to […]
When should you lubricate a lead screw?
It’s expected that a ball screw, with metal-on-metal rolling contact between the balls and the raceways, will require periodic lubrication with either grease or oil. One of the advantages that lead screws have over ball screws is that they can often operate without lubrication — eliminating maintenance and the potential hazards that come with using […]
Magnetic linear encoder solves issues with variable gap distance
New Balluff product delivers impressive 12 micrometer accuracy at 1.0 mm A new magnetic incremental linear encoder system with exceptional ride height provides a much needed solution for applications with variable gap distance. The new BML SF2 system from Balluff provides 12 micrometer system accuracy at gap distances up to 1.0 mm and a maximum […]
How do magnetic linear encoders differ from optical versions?
Encoder technology generally falls into three categories: optical, magnetic, and capacitive, with optical and magnetic encoders making up the bulk of the industrial automation encoder market. Not very long ago, the choice between optical and magnetic technologies was primarily a matter of resolution. If encoder resolution below 5 microns was required, optical was the only […]
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