Ball nut preload offers several benefits to screw assemblies, but the most common reason for using a preloaded ball nut is to reduce axial play, or backlash, caused by clearance between the screw and nut raceways. Reducing this axial play does two things. It improves the repeatability of the screw assembly — meaning the assembly […]
What is curvilinear motion and when is it used?
In single-axis motion systems, travel is typically either linear (in a straight line) or rotary (in a partial or complete circle). But some applications call for a system that combines straight sections of motion with curved sections — referred to as curvilinear motion. Curvilinear systems generally take one of two forms: simple, constant-radii sections (such as […]
Stepper motor performance: Is it possible to get high torque at high speeds?
The most notable stepper motor performance characteristics are precise positioning, good holding torque, and good low-speed torque characteristics. But in some cases, application parameters necessitate high torque production at high speeds, while design or control constraints dictate the use of a stepper motor. Although stepper motors aren’t notable for their ability to produce high torque […]
Motion controller basics: What are the differences between PLCs, PACs, and IPCs?
As the “brain” of a servo system, a motion controller is responsible for ensuring the motor is following the specified motion profile and correcting any errors between the commanded value (in terms of position, speed, or torque) and the motor’s actual value. The motion controller also handles other supervisory and processing tasks, such as ensuring […]
Pick-and-place applications with Festo tools — showing at Pack Expo
Festo offers software and hardware to shorten packaging-machine development time and reduce engineering overhead. These components, systems, and software tools will be on display at Pack Expo on September 23 to 25 at the Las Vegas Convention Center Booth LS-6349. Design a pick-and-place robot and control cabinet in minutes Festo demonstrates a Cartesian robot and […]
How to calculate maximum encoder speed for linear and rotary designs
When choosing an encoder for motion applications, a few specifications immediately come to mind. What sensing technology should you use? What accuracy and resolution do you need? Does the application require incremental or absolute position feedback? But one specification that is sometimes overlooked during sizing and selection is the maximum encoder speed. Like any electrical […]
What are Hertz contact stresses and how do they affect linear bearings?
Linear bearings that use balls or rollers to carry a load are subjected to Hertz contact stresses — a type of material stress that plays a significant role in determining the bearing’s load capacity and fatigue life. When two surfaces of different radii are in contact and a load is applied (even an extremely small load), […]
How roller-screw and ball-screw actuators compare in high-force applications
As electric rod-style actuators overtake fluid power in a variety of high-force applications, it is important to understand how different screw technologies compare in the search for optimum performance and low life-cycle cost. By Daniel Schmit • Product Manager | Tolomatic Inc. Electric-rod actuators with either roller-screw or ball-screw technology are playing an expanding role […]
Bearing damage: What’s the difference between brinelling, spalling, and fretting?
Bearing damage, and ultimately, failure, can be caused by a variety of conditions, including improper mounting, poor lubrication, and overloading, to name a few. The mode of damage — what actually happened to the bearing as a result of detrimental conditions — is characterized by visible features, such as discoloration, wear marks, or pitting, on […]
Low-power voice-coil actuator for cryogenic environments
H2W Technologies’ new high-force, non-commutated dc linear actuator, otherwise known as a direct-drive voice-coil actuator, is designed specifically for use in cryogenic environments. Material choice and design parameters were implemented such that the motor can operate without degradation or damage when placed in a cryogenic environment. The model NCC14-78-830-1SM can generate a continuous force of […]
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