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#062 Working with Linear Bushings -5: Linear Bushing Application Example on Simplified Automation Equipment - 2

Category : Linear Motion Components
November12, 2010

(2) Stepping Motors and Ball Screw Drive

・Ball screws provide good transmission efficiency and utilization of motor efficiency since [1] they directly convert motor's rotary motion into linear motion, and [2] the screw pitch works as a deceleration mechanism.
・[Fig.4] is a drive mechanism with ball bushings and a ball screw drive on the Y-axis, typically used where reduced cycle times and increased positioning accuracy are needed.

[Fig.4]

Supplementary Explanation

a) Stepping Motor Characteristics
・Stepping motors generate high torques in low speed (starting/decelerating) ranges, thus suitable for multiple position incremental moves over short distances.

b) Required Motor Accuracy to Achieve Targeted Positioning Accuracy
・When a 10mm lead (10mm/rev.) ball screw is selected for required accuracy of ±0.01mm, the following equation can be used to obtain the required motor accuracy (resolution).

(3) Air Cylinder Drive

・[Fig.5] is an air cylinder driven guide bearing of a clamp mechanism, and [Photo 2] is a magnetically coupled air cylinder mechanism. They both use linear bushings (arrow leader).
・Since the air cylinders cannot be velocity controlled during acceleration and deceleration, shock absorbers are used to reduce the shocks when stopping ([Photo 2]).

[Fig.5][Photo 2]

(4) Vertical Guide Example

・For vertical guiding applications, use of flanged linear bushings can achieve compact and simple mechanism without dedicated retaining mechanisms provided. (Linear Guides require a vertical base plate for guide rails)

[Photo 3][Photo 4]

・Flanged linear bushings are also used for elevator mechanisms for transfer conveyors ([Fig.6]) and locating mechanisms ([Fig.7]), similar to the mechanism in [Photo 4].

[Photo 6][Fig.7]

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