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Linear Motion Tips

Covering Linear Motion Systems, Components and Linear Motion Resources

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FAQs + basics

Ball spline preload: How, why, and when it’s applied

May 5, 2021 By Danielle Collins Leave a Comment

ball spline preload

Like other linear motion components where rolling elements ride in raceways, ball splines can be supplied with preload. In the case of a ball spline, the main purpose of preload is to reduce angular backlash — clearance in the rotational direction — when torque is applied. Without preload, ball splines have a small amount of […]

Filed Under: Ball + roller guides, FAQs + basics, Featured

What’s the difference between moment and torque in linear motion applications?

May 3, 2021 By Danielle Collins Leave a Comment

In linear motion, we often deal with applications that involve forces applied at a distance from a linear guide — referred to as cantilevered, or moment, loads. In these cases, we’re concerned with guide’s moment load capacity, or its ability to resist rotating. But we also deal with components that should rotate when a force […]

Filed Under: Applications, FAQs + basics, Featured

What is ball screw whip and why does it happen?

April 23, 2021 By Danielle Collins Leave a Comment

Ball screws are often the drive mechanism of choice in applications that require high thrust forces with excellent positioning accuracy and repeatability. But one of the drawbacks of ball screw technology is that speed is inversely related to length — the longer the ball screw shaft, the more likely it is to whip, like a […]

Filed Under: Applications, Ball + leadscrew driven, FAQs + basics, Featured

What is a 7th axis (also known as an RTU) and when is it used?

April 15, 2021 By Danielle Collins Leave a Comment

6-axis robot joints

Linear Cartesian and gantry robots are used extensively in automation, particularly for tasks such as pick and place and assembly. But for applications that require movements such as changing the orientation of a part or navigating around complex obstacles, the robot of choice is often the 6-axis articulated robot. Despite their dexterity, the reach of a […]

Filed Under: FAQs + basics, Featured, Integrated Linear Systems, Linear actuators (all)

When does open-loop stepper control still make sense?

April 7, 2021 By Danielle Collins Leave a Comment

open-loop vs closed-loop control

Stepper motors are inherently open-loop devices, able to make precise moves without feedback regarding motor position. But one of the drawbacks of using stepper motors in some applications is that if steps are lost (or gained), the system has no way to detect this. The resulting discrepancy between the actual position of the motor and […]

Filed Under: Controls for linear axes, FAQs + basics, Featured

The benefits – and drawbacks – of linear motors for dynamic applications

March 31, 2021 By Danielle Collins Leave a Comment

Linear motors can achieve high acceleration rates and long travel lengths with good thrust forces and extremely high positioning accuracies, while other drive mechanisms, such as belts, screws, or rack and pinions, must sacrifice at least one of these requirements in order to achieve the others. This is why linear motors are the preferred choice for […]

Filed Under: FAQs + basics, Featured, Linear motors

What’s the difference between a vertical lift stage and a Z axis actuator?

March 26, 2021 By Danielle Collins Leave a Comment

In many applications that require vertical motion, a Z axis actuator is combined with one or two horizontal axes in a Cartesian or gantry-style arrangement. In these multi-axis configurations, the moved load is mounted to the Z axis via a bracket, creating a moment load that affects not only the Z axis, but also the horizontal […]

Filed Under: Ball + leadscrew driven, FAQs + basics, Featured, Mini + piezo + voice coil

How is an LVDT similar to a resolver?

March 11, 2021 By Danielle Collins Leave a Comment

Both LVDTs (linear variable differential transformers) and resolvers are measuring devices that convert displacement into an electrical signal. As its name implies, an LVDT is used for linear measurement, while a resolver is used to measure rotary, or angular, displacement. In terms of construction and operation, the most significant similarity between an LVDT and a […]

Filed Under: Encoders + sensors (linear) + I/O, FAQs + basics, Featured, Uncategorized

Ultrasonic sensors for linear position and distance measuring

March 4, 2021 By Danielle Collins Leave a Comment

ultrasonic sensors

In nature, some animals — such as bats and dolphins — analyze the echo of a sound or call (a process known as echolocation) to navigate or to find prey. In industrial applications, ultrasonic sensors use the analysis of echos from ultrasonic waves to determine the presence, position, or distance of an object. Ultrasonic waves are […]

Filed Under: Encoders + sensors (linear) + I/O, FAQs + basics, Featured

Three easy ways to specify application requirements for linear motion systems

February 27, 2021 By Danielle Collins Leave a Comment

application requirements

The first step in any automation project is to clearly define the objective — what process are you trying to accomplish or what output are you trying to produce? Once the process or output is defined, it’s time to dig into the details of the application so you can choose the right components or systems […]

Filed Under: Applications, FAQs + basics, Featured

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