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Steps To Obtain 3D Models

April 15, 2019

The process is always a little different to obtain 3D models depending upon who’s software is being used. To save and download a Lintech model, the process is as follows:

The first step is to configure the product in a way that suits you requirement. In the example below, we’ll build a 550 series belt drive table. A 48” travel table has been configured. Once the product has been configured, select “Generate” and the part will soon appear to the right.

Generate

If you are satisfied with the way it was configured, you can begin to download it by clicking on “Download CAD File”.

Download 3D Model

After clicking on “Download CAD File”, you will be presented with a screen asking for the file format desired and if a 2D or 3D model is preferred. Select your choice.

3D Formats

The next screen prompts you to either left click(download) or right click(save as). Move your curser to the area asking for left or right click and make your choice. In the example, left click was chosen and the file created shows up on the bottom left of the screen indicating it has been downloaded to your computer.

Save As

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Online Worksheets

April 1, 2019

Lintech has online application worksheets for linear positioning “systems” as well as discrete ball screw assemblies. Once completed, just click “submit” and someone will respond to you acknowledging receipt of your application requirements and/or to ask any questions that arise.

Systems Application:      https://www.lintechmotion.com/formapply1.cfm

Ball Screw Application:   https://www.lintechmotion.com/formapply2.cfm

Online Worksheets

In the area of the worksheet called “application details”, add any other comments deemed important to point out.

Lintech Tool for Determining Required Motor Torque

March 15, 2019

Lintech provides a tool on their website for determining the required motor torque necessary when using a Lintech table. To find it, look on the right-hand side of the home page. On that page there is a link for “sizing apps”. When sizing apps is selected, the next page lists different Lintech screw driven tables, belt driven tables, rotary tables and ball screw assemblies. If a screw driven table is chosen, a 170 series for example, options will be provided for the type of “move profiles” desired. Select the desired profile.

Sizing Apps Page

170 Motor Sizing

Torque Calculator

Linear table information, application requirements, as well as the motor inertia from a model being considered must be entered. The calculator will provide a lot of information including total torque required. The total torque value would be compared against the motor torque curve for the motor being considered. The example below reflects calculation results based upon some fictitious data inserted.

Trapezoidal Profile Sizing

The total torque required in this fictitious example is 32.54 oz-in. Using the torque value of 32.54 oz-in, as well as the motor speed given from the profile results in the fictitious example, it is determined this torque value is required at a motor speed of 20.3 revs/sec(1,218 rpm). On the torque curve graph shown below for the motor being considered in the example, there is a red dot where 1218 rpm and 32.54 oz-in intersect.

Torque curve X23C-1

In this example, the red dot position is higher than the curve for 12.5V of power. So, for the example given, there must be at least 24V available to power the motor so the motor will have the torque at the speed necessary.

There are other useful tools available from Lintech to help find solutions for common tasks involving motors and mechanical systems.

Motion Control “Accuracy” Considerations

March 1, 2019

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

Accuracy versus Repeatability:

Accuracy & Repeatability

Quite often, applications require good repeatability more than accuracy.

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). 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.

Yaw, Pitch, Roll, Flatness & Straightness

Linear bearing & structure inaccuracies will cause a positioning system to move something other than what is desired. LINTECH includes these errors in the overall “Position Accuracy” value described on the website and in catalogs. LINTECH also provides flatness & straightness specifications for each table series. These values can be used as a general gauge to the overall linear bearing & structural quality of a positioning table. The better these values are, results in better accuracy & repeatability of the positioning table.

Linear bearing & structure inaccuracies include:

  • angular (roll, pitch, & yaw)
  • vertical runout (flatness)
  • horizontal runout (straightness)

Some of the sources of these errors are:

  • straightness of the linear rail
  • entry & exit of recirculating balls in the linear bearings
  • variation of the preload when moving along the rails
  • contaminants between linear bearings & rails
  • machining of the rail mounting surface on the table
  • machining of the base, carriage, and other components

Inaccuracies in the linear drive mechanism of a positioning table also contribute to its overall position accuracy. LINTECH provides acme screw, ball screw, and belt driven linear positioning tables.

Linear drive mechanism sources of errors include:

  • lead error of the screw
  • end support mounting of the screw
  • nut and screw quality & wear
  • lead error of the belt
  • belt stretch
  • end pulley quality & alignment

So, it is important to consider what move characteristics are most important to the performance of each application and maybe also to clarify what is undesirable for the application in order to consider the most suitable components.

For more information on component choices, contact Lintech.

Turcite vs. Acme Style Lead Screw Nuts

February 15, 2019

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.

Turcite vs. Acme

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.

So, a potential “downside” of an ACME screw is that it DOES have more friction than some other lead screws. However, that friction could also be a benefit of an ACME screw for some situations. For example, in a vertical orientation it may be the design of choice because in a situation where power is “lost”, that friction could possibly hold the load stationary vs. a “free fall” crash caused by gravity.

Lintech Linear Table Capacities

February 4, 2019

Lintech offers quite a few screw driven and belt driven linear table options. There are many characteristics to consider while choosing a linear table. One of those consideration of course is load capacity. Most manufacturers (if not all others) do not offer the option of choosing the number of bearings supporting the moving carriage. However, Lintech does offer this option. This means that the load capacity can be increased within a given table series before being forced to move to the next larger series to have an increased capacity. The table reflects the different Lintech table series capacities and the bearing options offered.

Lintech Table Capacities

In addition, the 170 and 180 series tables are now offered with 12-inch-long carriages in addition to 6 inch reflected in the table and also up to 6 bearings supporting the carriage.

6 bearing capacity

Mounting and Alignment

January 14, 2019

Alignment of linear guides and drive screws is critical linear motion systems. The use of a dial indicator or a laser alignment device is required for this procedure. Without a measuring device, it will be impossible to define exact parallelism and height alignment of the assembly. Improper alignment can cause excessive noise, binding, vibration, rough operation and outright failure after only a few operating cycles. In addition, for screw driven systems, it is extremely important that the ball nut is only loaded axially. There should not be any radial or side-to-side loading. The ball nut is rated for “pure” thrust load. If a dial indicator is not used, it will be difficult to measure any height variances.installation alignment

Lintech provides detailed instructions for the installation of linear motion systems in their Component Service Manual.

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