# Working with Linear Bushings Pt 1: Linear Guide Mechanisms

Engineers have many options when it comes to designing for linear motion.  The need for compact and efficient designs evolved the variety of linear guide mechanisms.  Rails and sliders are the simplest form of linear guide mechanisms, which are a combination of shafts and linear bushings (or oil free bushings).

Here are the limits of using shafts and linear bushings.

 Design Limits of Shafts and Bushings Solutions Design Evolution of Linear Guide Mechanisms Linear bushings cannot be used for rotary motion along the shaft circumference. Two shafts are used to constrict the rotary motion Ball spline + Spline shaft configuration. End supported shafts configuration does not provide enough rigidity against high downward loads. Use of larger diameter shaft and double linear bushings. Shaft guide rails + shafts + linear bushings

Advances in Linear Motion Guide Devices

Simplified depiction of the evolution is as follows.

Linear Motion Guide Devices Explained…

 a） A ball spline has ball rolling grooves on the shaft that are free to move only in a linear direction. (See [Fig.1]). This enables the circulating motion of evenly spaced balls to be maintained and high speed response to be achieved. Other benefits are that it eliminates collision, mutual friction between balls, and produces low noise.

 b） A guide rail support is provided under the entire length of the shaft, increasing the shaft rigidity. The mating linear bushing has a lower section removed to account for the guide rail. (See [Fig.2])
 c） Since a free moving ball retainer is the bearing element, there are no movement restrictions in either rotation or linear motion. d） Another linear guide design which is principally similar in construction to b), but have ball rolling grooves allow for higher load carry capability as the rail design increases bearing contact surface. (See [Fig.3]).

As technology evolves, design components must evolve with it.  Hence, the need for linear motion devices to handle more load, speed, be compact, and have long life were required.  This also allows for diversity in the design process.  Depending on your application parameters and requirements, there may be a linear motion device for your design.

• ### Working with Linear Bushings Pt 1: Linear Guide Mechanisms

Engineers have many options when it comes to designing for linear motion.  The need for compact and efficient designs evolved the ...
• ### 10 Tips About MISUMI’s 10th Edition Mechanical Automation Components Catalog

You asked for it, we answered! The 10th Edition Mechanical Automation Components Metric Catalog has arrived. To celebrate, we’ve compiled a ...
• ### The Battle of Stainless: 303/304 vs. 316

What Are the Differences Choosing the correct material is critical to any application especially those designed for wash-down, corrosion resistance, heat ...
• ### 4 Steps for Selecting a Mini-Conveyor

If your facility requires you to transport heavy or bulky materials or products then you are either using or looking to ...
• ### Conveyor Application Examples for Belt Conveyors

Conveyors are used across a variety of industries for a range of different purposes. They are often used in industries such ...
• ### Conveyor Q&As: Mini Conveyors & Mini Belt Conveyors

We sat down with MISUMI configurable mini-conveyors and got the nitty-gritty on some deep topics. You will find answers to some great ...
• ### Automation Design Tips: Conveyor Design

Work transfer conveyors when designed properly can yield promising results in your automation line. In this post, we review some elements ...
• ### 10 Tips About MISUMI’s 10th Edition Mechanical Automation Components Catalog

You asked for it, we answered! The 10th Edition Mechanical Automation Components Metric Catalog has arrived. To celebrate, we’ve compiled a ...
• ### The Battle of Stainless: 303/304 vs. 316

What Are the Differences Choosing the correct material is critical to any application especially those designed for wash-down, corrosion resistance, heat ...
• ### Conveyor Application Examples for Belt Conveyors

Conveyors are used across a variety of industries for a range of different purposes. They are often used in industries such ...
• ### Conveyor Q&As: Mini Conveyors & Mini Belt Conveyors

We sat down with MISUMI configurable mini-conveyors and got the nitty-gritty on some deep topics. You will find answers to some great ...
• ### Automation Design Tips: Conveyor Design

Work transfer conveyors when designed properly can yield promising results in your automation line. In this post, we review some elements ...
• ### 5 Reasons to Love Automation

It’s the season of love! Factory/industrial automation is a diverse industry with many benefits which is why MISUMI loves automation. Here ...