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Lintech 200 Series Linear Table

May 15, 2017

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.

200 series Screw Driven Linear Stage

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

Encoders on Lintech Tables

May 1, 2017

Linear Encoders: If a linear encoder is supplied by Lintech, it comes mounted and aligned to the positioning table. This encoder operates via an LED pick-up of an etched strip on a glass spar which spans the entire length of the encoder. It is important NOT to make any adjustments to the encoder mounting. The encoder alignment is extremely critical and is important for proper accuracy, repeatability, and performance. The warranty is voided if adjustments are made to any part of the encoder or encoder mounting.

Rotary Encoders: If a rotary encoder is supplied by Lintech, it comes installed on the table opposite the motor mount end. This rotary encoder is shaftless and is physically mounted to the screw shaft or drive shaft extension on a belt drive table. It is important NOT to remove the rotary encoder from the positioning table. The glass disk is pre-aligned by Lintech for proper operation. Removing the encoder could affect its performance. The encoder is protected with a sheet metal cover, which is not totally sealed. Therefore, if splashing fluid or other materials is present, precautions should be made to redirect these materials away from the encoder housing since contaminants which penetrate the housing can cause encoder failure.

Linear & Rotary Encoders

Ball Screw Assembly Lubrication

April 14, 2017

Every Lintech ball screw assembly requires a small amount of grease or oil for proper, long term operation. Lubrication will decrease system wear and the potential for oxidation of the ball screw surface. For most applications, a medium to heavy oil, light grease, or synthetic Teflon based lubricant is recommended. The many built-in pockets within the ball screw nut allow the adhesive properties of these lubricants to be stored for extended periods of time.

For high speed applications, a light grease is recommended, while the ball screw should NEVER be operated dry for any length of time. For some low speed and lightly loaded applications, a ball screw assembly can typically be operated without lubrication, but for the most part, this is not recommended. Use of WD-40, or other cleaning solvents, should strictly be avoided, as they can cause damage to the ball screw nut.

Because Turcite nut ball screw assemblies have a solid surface contacting a solid surface, sufficient lubrication becomes a must. If there is not proper lubrication, the higher frictional forces of these nuts will cause excess wear to the assembly, thus preventing required screw life from occurring. Applying lubrication directly onto the entire length of the screw on a regular basis is highly recommended.

All ball screw assemblies are shipped with a lightly coated rust preventative oil on the ball screw threads and ball nut. This oil is not meant as an operational lubricant. It is highly recommended that the proper lubricant be applied to the ball screw and linear rails prior to operation. Also, periodic re-lubrication helps assure that the rated life of the ball screw assembly is attained.

All End Support Housings do NOT require lubrication. The housings and bearings are internally lubricated for life, and sealed to prevent outside contamination from entry.

Ball Screw Lubrication

Lintech Application Tools

March 30, 2017

Lintech offers many online options and tools enabling the designer to get the necessary answers to application questions. There is a “Sizing Apps” page which helps with many types of motor sizing for all Lintech tables. There are also tools for determining if an application load will back-drive when power is off, one to determine the maximum safe operating speed for a ball screw, calculating linear bearing life, etc.

Once the designer chooses a table series which seems like it will be suitable, there is a page to calculate the price for the table with all of the desired options. Although it is possible to obtain better pricing for higher quantities or other situations, the price online enables the designer to get a good starting reference point for cost. Sometimes, slightly changing various components can help reduce cost so it can be beneficial to contact Lintech to review the selection parameters before purchasing online.

Sizing Apps Page

Lintech Custom Positioning Systems

March 15, 2017

Custom X, XY and XYZ linear positioning tables:

Sometimes a standard mechanical assembly, linear slide linear actuator or positioning system is not the right choice for a particular motion control application. It may also be impossible, or not practical, to have the system built in house by your own design team. Let Lintech take a look at your special requirements. We have been designing and building custom assemblies and positioning systems for over 45 years. We have the design engineering staff, a versatile machine shop, and the experienced assembly team to create that custom mechanical positioning system. We can use our many years of experience to help you select the right approach to a unique motion control problem.

Lintech has built positioning systems for OEM’s and Users for use in a wide range of markets. From fortune 500 companies down to 1 person shops. Contact Lintech with your requirements.

Lintech Custom Positioning Systems

Accuracy and Repeatability in a Motion System

March 1, 2017

Accuracy is described as how well a positioning system makes a true relative move in reference to an absolute 3D location. Repeatability is a drive mechanism’s ability to return to the same position multiple times under identical conditions.

Accuracy & Repeatability

In essence, if we lived in a perfect world, when a positioning system makes a 1.0 inch (25.4mm) move, it truly moves 1.0 inches (25.4mm). However, there are mechanical errors associated with every positioning system which may have to do with the linear bearings, structure, drive mechanism or other components. These errors will cause the positioning system to be less than perfect when making moves. This will result in move distances that will be something different than what is truly desired.

The linear bearing and structure inaccuracies can cause a positioning system to move something other than what is desired. Therefore, Lintech provides these errors in the overall “position accuracy” catalog values for a given table. Lintech also provides flatness and straightness specifications for each table series. These values can be used as a general gauge to the overall linear bearing and structural quality of a positioning table. The better these values are, the better the accuracy and repeatability of the positioning table.

The difference between accuracy and repeatability is widely misunderstood. Accuracy in a positioning system is much harder to achieve than repeatability, and it is also more expensive to accomplish. Applications like part insertion pick & place, and simple inspection stations require good repeatability, not necessarily accuracy. Why? Because once you have programmed the electronic motion controller and mechanical positioning table to position a load to a given location, you are typically more concerned as to how well the system can return to that location. Repeatability of the overall system becomes important for the application. The inaccuracies in the above systems can be offset by instructing the electronic motion controller to move a little bit more, or a little bit less. On the other hand, microscope X-Y inspection stands, semiconductor wafer probing machines, and coordinate measuring machines require both good repeatability and high accuracy. Why? Because for these applications to be successful, they need to be very accurate (in the truest sense) when making a move from one location to another. Many positioning system applications in the real world require high repeatability, not necessarily high accuracy.

Contact Lintech for guidance on selecting components for targeting accuracy and/or repeatability goals.

Linear Table Speed Limits

February 15, 2017

For each table series, Lintech provides a table in the catalog which reflects the Maximum Safe Table Operating Speed. These listed speeds are a mechanical limitation. The maximum speed of a positioning table depends upon the screw diameter, screw lead, screw length, and the screw end bearing support configuration. Lintech typically utilizes a fixed-simple screw end bearing support configuration in its positioning tables. The correct motor and drive system needs to be selected in order to reach the rated maximum table speeds. Below is the table for the 160 & 170 series tables.

170-speed-limit

It is possible to increase the speed limitation a little bit beyond the listed limit IF the end support configuration is modified to a rigid-rigid design. This configuration increases the screw rigidity by changing the bearing arrangements on each end and therefore enables the screw to rotate at a bit higher speed before whipping will occur.

Lintech actually chose to offer the rigid-rigid design as a “standard” on the 610 linear table series. This is a little more expensive but enables the 610 series tables to have a somewhat higher speed rating.

If you want to use a ball screw driven table and need to push the envelope a little for some reason, contact Lintech for ideas.

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