Posts Tagged 'Linear Actuator'

How to Select the Right Screw for your Linear Actuator

PowerPoint Presentation by Gary Rosengren, Director of Engineering at Tolomatic

The lead screw is an essential component in many electric linear actuators.  When selecting the type of lead screw a linear actuator should have, you need to strike a balance between purchase price and performance characteristics to get full value.

This new slideshow from Tolomatic shares the advantages and limitations of acme, ball and roller screws (the three screw types used in linear actuators.)  The slideshow also describes the application characteristics most suited to each screw type.

Acme Screws

acmme screw for linear actuatorAcme screws have a trapezoidal tooth form that’s very strong.  They come in a variety of leads and diameters to fit many electric linear actuator applications.  Nuts can be made from metals (which require lubrication to overcome friction) and self-lubricating plastics.

Acme screws operate quietly and are usually low cost.  They can be very inefficient because they need high motor torques to drive them due to the friction inherent in the sliding action between screw and nut.  But because of this friction and thread geometry, acme screws may reduce or eliminate back driving.

An acme screw is a good choice in applications that require slow speeds and low duty cycles.  However, variables such as nut material, environmental factors and the demands of the application affect the wear characteristics of acme nuts, so it can be difficult to predict the service life of these screw/nut systems.

Ball Screws

Ball screws are very popular in linear actuators.  They get their name from the re-circulating ball screw for linear actuatorball bearings that fit between the arch-shaped screw and nut threads.  The ball bearings transmit force and relative motion very efficiently as they roll through one or more circuits in the nut.

Ball screws are available in many diameters, leads and accuracies.  Under ISO 3408, they’re classified by lead accuracy in one of five grades – 1, 3, 5, 7 or 10 – with grade 1 being the most accurate.

Ball screws have higher thrust capabilities, longer service lives and higher efficiency than acme screw systems.  On the downside though, some ball screws can be back driven easily (depending on the lead), are higher cost and can be noisy.  They’re ideal for applications that require high duty cycles, high thrust and high speeds.

Roller Screws

roller screw for linear actuatorRoller or planetary screws have triangular-shaped threads which match up with multiple threaded rollers in the nut.  These rolling elements create a highly effective system for transmitting force, even better than that of a ball screw.  Like ball screws, roller screws are classified by lead accuracy into five grades.

Roller screws have very high force transmission capabilities since the rollers have significant contact with the screw threads.  They come with a higher price tag though, which is balanced by the fact that they are long lasting, capable of high speeds and quick acceleration, and require little maintenance. Some roller screws may be back driven, though, depending on the lead.

Roller screws are best suited to applications where their high performance and long service life outweigh their initial purchase price.

More information on Tolomatic’s Product Family can be viewed at-

http://www.electromate.com/products/?partner=1175527175

For more information, please contact:

EDITORIAL CONTACT:

Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

 

Tags:  Electromate, Tolomatic, Linear Actuator, Electric Linear Actuator, Rodless Cylinder, Rod Style Cylinder

 

IP Ratings & the Manufacturing Environment: How to apply linear actuators for quality, safety and long service life

A New White Paper from Tolomatic.

IP Ratings & the Manufacturing Environment:   How to apply linear actuators for quality, safety and long service life.

Click on the link below to download this White Paper.

http://mail.tolomatic.com/archives/pdfs/9900-9207_00-IP-Environments.pdf

 

Tags:  IP Rating, Linear Actuator, Electric Linear Actuator, Linear Positioner, Rodless Cylinder, Rod Style Cylinder

New RCP4W-RA IP67 Water Proof Radial Cylinder from IAI

Introducing the IP67 Water-proof Radial Cylinder, the newest addition to the dust-proof/splash-proof ROBO Cylinder® RCP4W series — Built-in guide to achieve longer strokes while accommodating a radial load on the rod!

A 1 minute video illustrating the actuator can be viewed at-

More information on the RCP4W-RA IP67 actuators from Intelligent Actuator can be viewed at-

http://www.electromate.com/products/series.php?&series_id=105503

For more information, please contact:

EDITORIAL CONTACT:

Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

 

Tags:  Electromate, IAI, Intelligent Actuator, Robo Cylinder, Linear Actuator, Electric Linear Actuator, Rod Style Smart Actuator, IP67, dust-proof, splash-proof

 

 

Choosing the best linear actuator based on manufacturers’ specs

Source:  Tolomatic Blog.  Originally posted by Gary Rosengren on Tue, Apr 22, 2014 @ 08:39 AM

Motion system designers often need to evaluate competing components to select the best one for an application.  For linear actuators and other motion system components, the decision generally comes down to which product will provide the longest service life given the specifications of the project.

Manufacturers give you performance data which can serve as guidelines for component ball screw linear actuatorselection and use.  Keep in mind, though, this information is for the individual component only and may not relate directly to the configuration and conditions of your application.

When you’re comparing data from different manufacturers, be sure you’re comparing apples to apples.  For linear actuators you may need to normalize the data of all the rolling elements (such as the ball screw or roller screw) as well as the linear bearing components in the system to the same Basic Rating Life (L10)

Basic Rating Life

International standards define life for individual ball or roller screws as the number of revolutions the shaft makes in relation to the ball nut body before the first evidence of fatigue develops in the load bearing raceways of the screw shaft, nut body, balls or rollers. For linear ball bearing systems life is defined as the linear distance traveled by a system before the first evidence of fatigue develops in the linear bearing rails.

Basic rating life (L10) for ball or roller screws for an individual screw or group of apparently identical ball/roller screws operating under the same conditions is the life associated with a 90% probability of achieving the nominal life (1,000,000 revolutions.) For linear bearing systems, basic rating life (L10) is expressed in linear units (100,000 meters of travel).

The standardized life equation for ball/roller screws is:

L10 = (C/P)3 x 1,000,000, where

         L10 = basic rating life in revolutions

C = dynamic load rating

P = application load

The standardized life equation for linear bearing systems is:

L10 = (C/P)3 x 100,000, where

         L10 = basic rating life in meters of travel

C = dynamic load rating

P = application load

These equations show the fundamental relationship between load and life. When the load on any given load bearing component is reduced by half, the life is eight (8) times longer. Inversely, increasing the load by 50% reduces the expectation to about 30% of life.

A Real-Life Example

Consider this example of evaluating linear bearing capability. You need to determine which actuator is more robust and best suited for an application. Manufacturer “A” (in red on the chart) has a maximum load capacity of 3,080 N (692.4 lbs.) while manufacturer “B” (in blue) has a maximum capacity of 1,996 N (448.7 lbs.)

In this first chart (on right) it looks like “A” is the winner, doesn’t it?linear actuator specs

But consider this. Manufacturers specify the linear distance or number of revolutions to which their ratings apply. So load ratings are based on the rolling elements’ specified L10 travel distance.

In our example manufacturer “A” has a Basic Rating Life of 600 Km while manufacturer “B” has a Basic Rating Life of 5000 Km. When Basic Rating life is normalized to 600 Km, this linear actuator specssecond chart (on left) tells a different story. Because the product from manufacturer “B” is able to carry the load for a longer distance, manufacturer “B” wins.

Normalizing the manufacturers’ data is a critical step in comparing performance data. It can lead to important discoveries.

 

 

 

 

For more information, please contact:

EDITORIAL CONTACT:

Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

Tags:  Linear Actuator, Electric Linear Actuator, Tolomatic, Electric Cylinder, Electromate

New High-speed ROBO Cylinder® From Intelligent Actuator Inc.

New ROBO Cylinder® High-speed Type from IAI achieves the Max. Speed of 2500 mm/s and Max. Acceleration of 3.2 G (Instantaneous Max. Acceleration of 4.8 G).  Improved High-speed Performance Reduces the Cycle Time!

High Speed Robo Cylinder

High Speed Robo Cylinder

The Robo Cylinder ® is a flexible, intelligent, and economical, ballscrew linear actuator from Intelligent Actuator.

Economical and easy to use, the Robo Cylinder® is specifically designed to accomplish the simple tasks usually assigned to air cylinders, but with greater flexibility and control.

Offering custom control over position, speed, acceleration, deceleration, and torque, allowing for mid-move velocity changes, and control from a PLC, the Robo Cylinder® is a versatile and easy-to-use alternative to pneumatic cylinders.

Robo Cylinders are available in a wide variety of configurations to suit the requirements of your specific application. The main variations are found in the basic body construction and the type of motor employed.

The Robo Cylinder® RCS series feature AC servo motors integrated with the ballscrew, eliminating the need for a coupling. Model types include slider, folded-motor slider, rod, and single, double, or ball-bushing type guided rod actuators. RCS actuators utilize incremental or absolute optical rotary encoders. Due the use of an AC Servo motor, the RCS is best suited to high-speed, low-payload applications requiring constant torque.

More information on the actuators from Intelligent Actuator can be viewed at-

http://www.electromate.com/products/series.php?&series_id=101190

For more information, please contact:

EDITORIAL CONTACT:

Warren Osak
sales@electromate.com
Toll Free Phone:   877-737-8698
Toll Free Fax:       877-737-8699
www.electromate.com

 

Tags:  Electromate, IAI, Intelligent Actuator, Robo Cylinder, Linear Actuator, Electric Linear Actuator, Rod Style Smart Actuator

Automation and Food Safety Webinar: IP69K Products to meet new FDA FSMA standards.

New YouTube Video-   54:01 min.  

Automation and Food Safety Webinar

Automation and Food Safety Webinar

View our on-demand Webinar anytime!

 

 

You can watch a recording of this webinar and previously recorded webinars on our YouTube channel:

https://www.youtube.com/playlist?list=PLrKivfJ0mSQlLyxYe3Q8_6eZaWP7Ket2V

Tags:  IP69K, FDA, FSMA, Automation, Electric Actuator, Linear Actuator, Stainless Steel Motor, Servo Motor, Stainless Steel Gearbox, Planetary Gearbox, Tolomatic, Kollmorgen, Micron Gearbox

Stepper Motor Linear Actuators 101

What exactly is a Stepper Motor Based Linear Actuator?

Need to know how a Stepper Motor Linear Actuator works?

Suppose you, as an engineer, are tasked to design a machine or part of a machine that requires precise linear positioning.   How would you go about accomplishing this?  What is the most straightforward and effective method?

Haydon Kerk Stepper Motor Linear Actuator White Paper

Haydon Kerk Stepper Motor Linear Actuator White Paper

When students are trained in classic mechanical engineering, they are taught to construct a system using conventional mechanical components to convert rotary into linear motion.   Converting rotary to linear motion can be accomplished by several mechanical means using a motor, rack and pinion, belt and pulley, and other mechanical linkages.   The most effective way to accomplish this rotary to linear motion, however, is within the motor itself.

This White Paper, from Haydon Kerk Motion Solutions, discusses the technology behind stepper motor linear actuators, what makes them different, and concludes with a detailed example illustrating how they should be sized to move a given load.   Click on the link below to download it.

http://www.electromate.com/db_support/downloads/Stepper_Motor_Linear_Actuators_101v2.pdf

More information on the Haydon Kerk Can Stack Stepper Motor Linear Actuators can be viewed at-

http://www.electromate.com/products/?keyword=Hybrid+Stepper+Motor+Linear+Actuators&d=105216

For more information, please contact:

Electromate Industrial Sales Ltd.
www.electromate.com
sales@electromate.com

Phone:  905-850-7447
Fax:       905-850-7451
Toll Free Phone: 877-737-8698
Toll Free Fax:   877-737-8699

Tags:  Stepper Motor, Step Motor Linear Actuator, Stepper Motor Linear Actuator, Electromate, Haydon Kerk, Step Motor, White Paper


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