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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.  

Lintech 170 Series

December 1, 2020

The Lintech 170 series screw driven tables are very versatile. They can support a relatively high capacity, are medium level precision, many drive screw variations (diameter & pitch), even different carriage lengths (more/less bearings underneath), and lots more options – ALL at a very reasonable cost.

170 series versatility

The 170 series is six inches wide and is available with a 6 or 12 inch long carriage. With the 12 inch carriage it has a static capacity of 12,600lbs. The carriage rides on profile rail, recirculating linear ball bearings. Unlike just about any other manufacturer, you can actually select whether you want 2, 4 or 6 bearings to support the carriage.  If your loads are significant and especially if moment loads are involved, the 170 series will be an economical solution in a relatively compact package size. It has become one of the most popular products Lintech offers.

Lintech products have more standard configurations than almost any other linear table vendor. However, if you have a highly custom application which still requires more than what you can find in the standard offering, do not hesitate to contact Lintech with your linear positioning system requirements.  

Lintech 550 Series Belt Driven Table

November 16, 2020

The Lintech 550 series linear slides are designed to handle large loads at very high speeds. These linear actuators use a low friction, preloaded, recirculating ball bearing system, which rides on a single precision ground linear square rail. The single linear profile rail is mounted to a precision machined aluminum base, which offers rigid support over the entire travel of the table’s carriage.

The actuator load is mounted to a precision machined aluminum carriage, which has slots machined into it. These slots, along with the base mounting brackets, are used for mounting the user load. The drive system uses two pulleys, along with a high strength, steel reinforced polyurethane belt, which provides 8.071(205mm) inches of linear movement per revolution of the input shaft. The simple belt tensioning system allows for easy adjustment of belt tension by the user. The belt also acts as a cover, preventing debris from getting into the linear bearing and rails.

Precision Hardened Shafting for Linear Motion Applications

November 2, 2020

Lintech offers shafting for use in linear motion applications. The type of shafting offered is Hardened steel which is rated at about 60 on the Rockwell C scale. Hardened steel provides for the best duty life and performance under a load. The steel is also manufactured to dimensions with very tight tolerances – a few ten-thousandths of an inch to provide accuracy and consistent fit-up when used with a ball bushing. The most common shafting tolerance range is called Class L. Class L shafting is used with self-aligning bushings. Class S shafting is used with non self-aligning bushings. The tolerance range for the Class S shafting is about .0005” smaller than class L.

Precision Shaft Assemblies (TRSA) & Carriage Assemblies (TRCA)

October 16, 2020

Lintech provides both single and dual, precision round rail steel shaft assemblies. These shaft assemblies have a precision machined 6061-T6 aluminum black anodized base that runs the entire length of the shaft which not only supports the user load as it moves along the shaft, but the support also has pre-drilled base mounting holes that allow for easy customer mounting to a machines’ frame. The shaft straightness specifications 0.001/0.002 in/ft. cumulative. Shaft diameters are available from 0.500 to 2.0 inches in 6 to 192-inch standard lengths. Some standard sizes can be shipped in less than 2 days, while any length can be provided as a custom in as little as 1 week.

The TRCA series is a pre-engineered carriage assembly which has either SLBO or DLBO pillow blocks mounted to a 6061-T6 black anodized precision machined aluminum plate. The pillow blocks are doweled to the carriage plate and are pre-aligned to match Lintech’s TRSA series shaft assemblies. The use of a TRCA carriage assembly and a TRSA shaft assembly in a mechanical positioning application greatly reduces the time-consuming process of mounting & aligning two shafts and pillow blocks. Each carriage surface is precision machined which allows for accurate mounting of customer loads. Also, carriage assemblies are available with pre-machined stainless-steel inserts, which allows easy mounting of customer loads to the carriage plate. Carriages are provided with pillow blocks for shaft diameters from ½ to 2 inches and come in standard carriage lengths from 6 to 30 inches.

These assemblies offer smooth linear motion and very low drag.

Lintech Background

October 1, 2020

For over 49 years, LinTech has designed, engineered, and manufactured positioning components and systems for use in a wide range of Linear Motion Control applications. LinTech manufactures both standard and custom mechanical positioning components and systems for both Linear and Rotary Motion Applications. 

In the world we live in today, corporations are gobbled up constantly.  As this consolidation occurs between organizations, manufacturing locations sometimes change, product focus changes, philosophies are different, etc. These resulting changes can often negatively impact a percentage of customers. With many customers demanding the manufacturing processes for the products they purchase DO NOT CHANGE, combining organizations can be viewed as a real problem.

Since Lintech has been independently owned and operated for so long, it could be said that Lintech has more stability than some of the biggest players in the automation industry.

If you would like to work with Lintech on an automation project, please contact us.

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