Engineers apply the knowledge of math & science to design and manufacture maintainable systems used to solve specific problems. AskEngineers is a forum for questions about the technologies, standards, and processes used to design & build these systems, as well as for questions about the engineering profession and its many disciplines.

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You can change the formatting of class fit type dimensions and tolerance type dimensions using the options in the Tolerance Text section of the Text tab (Dimension Style and Dimension Properties) dialog box. For example, you can specify a slash or a horizontal separator; how to align the numbers (to the + or - sign or the decimal point); and whether to use a degree symbol.

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By default, the Upper Tolerance box displays the positive upper tolerance value, and the Lower Tolerance box displays the negative lower tolerance value.

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You can use the Upper Tolerance Sign (+) button and the Lower Tolerance Sign (-) button to specify whether the value in the box is a positive value or a negative value. Selecting either button changes it from + to -, and from - to +.

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Another way to change the values from positive to negative is to type a - or + in the box and then use the Tab or Enter key to update the dimension. This does not change the state of the button on the command bar.

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Sets the round-off for the value. This option is sensitive to the unit setting (decimal or fractional) and contains values as appropriate for the unit. This option is also sensitive to the dimension being placed and contains values as appropriate for the dimension.

I am at the beginning of the design of a small platform that will move in X(1500mm) and Y(1000mm) axis. Motion will be provided by belt driven linear actuators (1 per axis). I would like to add linear rails to platforms outer edge(s) to provide rigidity and reduce roll moments on the linear actuator stages.

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Specifies that the setting on the Dimension Style tab of the Options dialog box determines the dimension style.  When you set this option, Dimension Style is unavailable.

You can type the tolerance values in the upper and lower boxes, and use the + and - buttons to specify that the values are positive or negative.

Given I am most concerned with the longevity, rigidity, and precision of the system, what are some Pro's and Con's of the Linear Guides vs the Linear Slide Rails?

On the other hand I could use a linear guide rails. They have high static loads, moment load and pitch moment load capabilities. I have not used them extensively. They do seem to be the more popular choice in design of automated systems.

You can format the unit tolerance values using the options on the Units tab and the Secondary Units tab in the Dimension Properties dialog box.

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I've used linear slide rails in the past, but not under this particular application. They are inexpensive, easy to find, and have high static load ratings, I am not sure how their static pitch moment compares w/ linear guide rails.

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Changes the state of the selected dimension between driving (locked) and driven (unlocked). If you want to set this option before you place a dimension, you must first select the Maintain Relationships command.

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You can type the tolerance values in the upper and lower boxes, and use the + and - buttons to specify that the values are positive or negative.

You can specify Tolerance (unit) layout and justification on the Units tab and the Secondary Units tab in the Dimension Properties dialog box.

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