If you’re involved in ball screw sizing or selection, you’ve probably noticed that there are several different standards that govern various aspects of ball screw design, from lead accuracy and load capacity to ball nut tolerances and rigidity. Fortunately, in many cases, these standards are in harmony and provide the same (or virtually equivalent) specifications. […]
Profiled rail accuracy: When accuracy class doesn’t tell the whole story
You’ve chosen a profiled rail and bearing for a high-precision application — machining, cutting, or metrology, for example. The bearing (aka carriage, or runner block) has good load capacity and rigidity, so it should provide long life and low deflection. But when you integrate the assembly into your application, you notice that the system doesn’t […]
Under development: Linear stroke-extending technology from Ascending Power
In a recent email exchange with London-based John Hammerbeck of Ascending Power, we learned more about a novel new linear-motion extension technology from the company. The actuator steps up a short input stroke to a long output stroke using either kinematic linkages or permanent magnets. Below is a SolidWorks animation of the linkage variation; depending […]
What is sub-divisional error (SDE) in linear encoders?
To determine the position of a linear axis, an encoder read head travels along a scale and “reads” changes in light (for optical encoders) or magnetic field (for magnetic types). As the read head registers these changes, it produces sine and cosine signals that are shifted 90 degrees from each other (referred to as “quadrature […]
Compact voice-coil motors from Moticont with 1.0-in. diameters for myriad stroke requirements
Moticont now sells linear voice coil motors (LVCMs) in two 1-in. (25.4-mm) diameter motors. • The LVCM-025-022-01 has a stroke length of 0.375 in. (9.5 mm) a mid-stroke length of 1.30 in. (33 mm) and a high-force-to-size ratio of 16.9 oz (4.7 N) and a peak force of 53.5 oz. (14.9 N) at 10% duty […]
High-force iron-core brushless linear motor from H2W Technologies
H2W engineers have developed a compact high force brushless linear motor (BLSM-1F) that can generate 300 lb (1330 N) at a 10% duty cycle and 100 lb (444 N) at a 100% duty cycle, and, when used with a matching magnet track (BLST-FSX). The mass of the coil assembly is 19 lb (9 kg) which […]
New SMAC LBL25 linear actuators — fast, cost-competitive, and stackable
SMAC Moving Coil Actuators now sells LBL series linear actuators — price competitive with ball screw and high-cycle-rate air cylinders thanks to a simple no-milling plate design. The LBL design features flat printed coil and single-piece, screw down magnets. It’s equipped with SMAC proprietary encoder and gives more than 100 million cycle expected life. Starting […]
Choosing the right stage actuation for dynamic-metrology applications
When measurements are made to discrete product on the fly, it’s key that the motion system minimize error and correct for the rest. Brian Handerhan | Business development manager • Life sciences Patrick Lehr | Product manager • Precision mechanics Electromechanical & Drives Division • Parker Hannifin Corp. Dynamic metrology is the collection of data […]
7 tools every mechanical engineer should have
As computer programs and mobile apps take over our lives, one of the great things about being a mechanical engineer is that there are still aspects of the job that allow — and sometimes require — us to do things by hand, the “old fashioned” way. Granted, drafting boards and T-squares have been replaced by CAD […]
Heavy-duty but lightweight slide is a solution for transportation and industrial uses
Accuride International announced the U.S. launch of its AL4160 Super Heavy-Duty Aluminum Slide – a strong but light solution that combines a full aluminum body with stainless steel components for diverse transportation and industrial applications. “We designed the AL4160 to address a market need for a slide that supports heavy loads and performs in harsh environments but […]
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