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Lintech Shaft & Carriage Assemblies

May 3, 2021

Shaft & Carriage Assemblies were one of the first custom products which Lintech made many years ago. These consist of pre-assembling shafts onto a support and mounting pillow blocks on a plate to create a carriage. These assemblies soon became a standard Lintech product line and they are still widely utilized in linear motion applications.

Lintech shaft and carriage assemblies are offered in a variety of shaft diameters and overall lengths. Carriage assemblies are also made to fit the shaft assemblies and can be from 6 inches to 30 inches long. These assemblies can be ordered to be suitable for use in applications where there may be corrosion concerns. Carriage assemblies can be obtained with hand wheel locks which provide for a manual lock to the shaft. To check out Lintech shaft assemblies, carriage assemblies and other linear motion products, click here.

Lintech Online Tools

April 15, 2021

Lintech manufactures linear motion systems for precision positioning. Part of a task to create a precision positioning system is to select a motor package which will move the specified load at the desired speed under the given conditions. Lintech offers online tools to aid in selecting a motor package with the necessary torque and speed capability.

On the main page there is a link to “sizing apps”. By clicking on that link, you will be taken to a page where you can select the Lintech table you have selected and then you will be prompted to fill in your application specifics in order to calculate the torque and speed required by a motor to perform your task.

Also included on the page with the sizing tools are other useful tools often used for determining the appropriate linear system.

Lintech ARC Linear Guides

April 1, 2021

Lintech offers a wide variety of profile rail linear guides. Many different options to compete and dimensionally match with lots of other manufacturers guides. The ARC series is another one of the models which falls into that category. The market niche Lintech has earned a position in, is low cost and availability while still offering quality and performance. Many of the actual linear guide “applications” we encounter do not even begin to test linear guide performance limits. So, it comes back to proper sizing. If you can offer a good product which is used properly, while also offering a great price and quick deliveries, you’ve got something!

Lintech 200 Series Linear Table

March 15, 2021

The Lintech 200 series linear translation stages are designed to maximize performance while minimizing physical size and cost. These linear motion stages use a low friction, preloaded, recirculating linear ball bearing system, which ride on precision ground linear square rail guides. The linear profile rails are mounted to a precision machined aluminum base, which offers a rigid support over the entire travel of the table’s carriage. The load is mounted to a precision machined aluminum carriage, which has threaded stainless steel inserts for high strength and wear life. There are 22 different acme and ball screw options that offer high efficiencies and long life at an economical price. These linear stages are designed to allow for numerous options. They include End-Of-Travel and Home switches, linear and rotary encoders, power-off electric brakes, motor wrap packages, and versatile mounting brackets for multiple axis applications.

The 200 series table is 95mm tall, 216mm wide. It has an 8,800 pound capacity and a top speed of 1270mm/second.

Multi-Axis Mounting Configurations

March 1, 2021

Lintech provides standard or custom mounting brackets to mount multiple axes together in an assortment of configurations. In some cases one table can be mounted directly on top of another. However, often some sort of intermediate bracket is required in order to obtain the necessary orientation.

Since Lintech tables are used for high precision and significantly loaded applications, the brackets for different mounting arrangements need to be very strong and very accurate, not just a plate to which the tables can be attached. Hence, they represent a significant cost. Having many pre-configured standard designs allows for more efficient pricing.

Lintech will also perform the actual mounting of multiple axes to make sure all axes are aligned properly. In addition, they can also add motors, controls, switches, and etcetera, to complete the entire motion control system.

Ball Screw Housing Support Bearing Assemblies

February 15, 2021

As a “standard product”, Lintech offers four different types of ball screw housing support styles.

These configurations allow the designer increased flexibility to “fine tune” the design to obtain the most suitable components for a given set of requirements. For instance, if the design requires higher speeds and/or higher rigidity, you can weigh out the housing configuration differences, as well as every other ball screw design choice to achieve the best performance trade-off combination.

For assistance on determining the best design trade-off for your application, contact Lintech.

Turcite vs. Acme Style Lead Screw Nuts

February 1, 2021

Lintech offers different types of sliding element nuts in linear table screw driven systems. The terms “lead” screw and “ACME” screw are talked about frequently. An ACME screw refers to a specific thread form which is trapezoidal in shape. A lead screw refers to screws which utilize nuts which do not have rolling elements. They are just sliding on the screw. An ACME screw is a type of lead screw. Lintech offers ACME style lead screws as well as lead screws which incorporate the shape of thread used for ball screws. Lintech will utilize Turcite, a polymer material shaped to mate to the ball screw form.

Utilizing a Turcite nut on a ball screw form produces a drive mechanism that has less friction than an acme screw, thus potentially allowing for higher speeds and less input torque required from an attached motor for a given application. It provides smooth motion, low audible noise, and is ideal for vertical applications. Also, using the Turcite nut with high lead ball screws provides for faster linear speeds. A “downside” or maybe a benefit of an ACME screw HAS more friction. So, in vertical applications, it may be the design of choice because in a situation where power is “lost”, the friction could possibly hold the load in position vs. a “free fall” which is a potential problem.

Motion Control “Accuracy” Considerations

January 15, 2021

There are some important terms pertaining to motion control positioning which sometimes get lumped together under the term accuracy.

Accuracy versus Repeatability:

Quite often, applications require good repeatability more than accuracy. Suggesting “accuracy” is what you seek in a linear move will generally lead you to a more expensive positioning system than if asking for just repeatability.

Accuracy is described as how well a positioning system makes a true relative move in reference to an absolute 3D location. In essence, if we lived in a perfect world, when a positioning system makes a 1.0 inch (25.4 mm) move, it truly moves 1.0 inches (25.4 mm) in a straight line, single plane, etc. However, there are mechanical errors associated with every positioning system. These errors will cause the positioning system to be less than perfect when making moves. Move distances that will be something different than what were truly desired.

For whatever reason, sometimes specific applications may require more emphasis on “characteristics” of the accuracy within the overall move.

Linear Motion Tables – Difficult Environments

January 4, 2021

Standard Lintech positioning tables are designed to operate in most general industrial environments. The normal operating temperature can vary between 00 F to +1850 F (-180 C to +850 C), while the general surrounding environment should be free of moisture, fine dust and corrosive chemicals. All aluminum components used in standard positioning tables are either black or clear anodized. All steel components (such as linear bearings & screws) require a level of lubrication to help prevent oxidization (rusting).

Operating a positioning table in certain environments may require the use of special materials or other modifications within the system. Lintech can, and often does, modify a standard table to operate in many different environments.

Clean Room Environments call for the removal of all (or most) particle generating components within a positioning table. Depending on the clean room requirement (class 100, 10 etc.), seals, plastics, wipers, and waycovers may need to be removed or replaced with special materials. The use of chrome plated or stainless-steel hardware, along with special clean room lubricants will be required.

Corrosive Environments require chrome plated or stainless-steel hardware to protect the linear bearing & drive mechanism, along with special lubricants that will operate within the application.

Dusty Environments will require waycovers to protect the linear bearing & drive mechanism from getting “gummed” up. For applications involving particulate contamination, a positive air pressure under the waycovers may be required.

High/Low Temperature Environments may require special linear bearings or drive mechanisms, along with special lubricants.

Vacuum Rated Environments down to 10-7 torr are possible by removing all rubber & plastic materials, along with all paint and grease from table surfaces. Vacuum compatible lubricants, special insulated cabling, and special plated materials may be required.

Wash Down Environments require chrome plated or stainless-steel hardware to protect the linear bearing & drive mechanism, along with special lubricants that will operate within the application.

Contact Lintech for assistance if you have questions or would like assistance determining the best solution for your applications’ combination of environmental factors.

Welding Environments may require the use of special telescoping steel (or fireproof) waycovers to protect the linear bearing and drive mechanism from hot debris.

Environmental Conditions To Consider When Specifying A Linear Table

December 15, 2020

The life of a positioning table is highly dependent upon its operating environment. Premature failure can occur if the system is not designed to operate within the environmental conditions where it is installed. Some environments which warrant special considerations are as follows:

  1. High moisture, humidity, condensation, outdoors, fluid splashing, or corrosive.
  2. Grinding, welding, etc. – where debris can contaminate the ball screw nut and/or linear bearings.
  3. High or low ambient operating temperatures.
  4. Specialty environments such as – clean rooms, vacuums, underwater, radioactive, or “gritty” particles in atmosphere (glass, ceramic, etc.).

The positioning table design may need to change depending upon what type of environmental condition it is being utilized. Below is a list of recommended table options to withstand various environments.

In applications where there is an extreme amount of particulate generation, positive air pressure should be considered on the table in conjunction with the waycovers. As waycovers compress, an inward airflow can be created that can be strong enough to “suck” particulates into the positioning table drive cavity. The speed at which the table operates directly affects the magnitude of the inward airflow intensity.  

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