Terms and Definitions for Linear Motion Systems by Techno Inc.

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[View page 1] previous rfq page next index page home page 2 terms and definitions for linear motion systems there are many terms that are commonly used in industry that are not always understood by designers end users and other technical persons although some of the terms take on obvious meanings others may not this section is provided so that such people can use these terms in proper context to relieve the possibility of design criteria and specifications being too tightly constrained due to lack of effective communication having the following terms explained and understood allows for a more efficient design process and a more cost-effective solution point to point accuracy or accuracy is defined as the difference between the statistical mean of a series of measurements and the theoretically correct position another way of stating this is to say that point to point accuracy is the ability to travel to a desired point or series of points with respect to some known reference straight line accuracy is

[View page 2] previous rfq page next index page home page technical information case 3 not accurate and not repeatable mean absolute position large number of samples absolute position 12 10 8 6 4 2 0 mean position ŻŻ x number of samples backlash is defined as the dead band experienced when changing directions this phenomenon is caused by a clearance between interactive elements in a drive train and/or bearing system backlash is typically found between gears or between a nut and screw a common and less technical description of backlash is defined to be the amount of play or slop in a system the largest contributing factors to backlash stem from the drive train and bearings being imprecise or worn preloading the drive train and bearings will remove excess play in a system and this type of system is generally referred to as anti-backlash resolution is defined as the smallest attainable increment of adjustment or positioning the minimum amount that a posi