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Low Cost Automation Tutorial
#002 Precision Shafts
Category : Linear Motion Components
July14, 2009
Due to their simple structure allowing high dimensional accuracy in machining, shafts are used for high precision linear guides. Misumi shafts feature:
* | Fit tolerance g6 (for requirement of precision motion with fine linear accuracy) or f8 (for use with grease or oil-lubricated bearings). | |
* | High surface hardness with employment of induction hardening and hard chromium plating. | |
* | Excellent circular tolerance and straightness plus concentricity and perpedicularity of finish ends. | |
* | A wide choice of end finishes. |
Examples of linear motion applications using shaft(s)
a) Typical linear mechanism using two parallel shafts (see Figure 1 and Photo 1)
1. | Using two shafts eliminates displacement, achieving high-precision linear motion capability and high load capacity. (See Photo 1) | |
2. | Two types of bushings are available: linear bushings and oil-free bushings. Typically, linear bushings are used. | |
3. | Oil-free bushings have high load capacity (compared to linear bushings) and are recommended for mechanisms subject to shock. Oil-free bushings, however, have larger friction resistance compared to linear bushings (which contain linear ball bearings), and should not be used for mechanisms subject to long continuous operations. |
b)Linear mechanism using a single shaft (see Figure 2 and Photo 2)
1. | With a linear mechanism using a single shaft, the shaft can serve as a motion guide involving linear and rotaty motions or as a linear guide by restraining rotation. Figure 2 shows the latter case. | |
2. | The linear mechanism prevents rotation because the cylinder piston is acting as a second shaft. Therefore this configuration is not suitable for applications that require high load capacity. Photo 2 shows an example of using a linear shaft and air cylinder. | |
3. | For a single-shaft mechanism, either long linear bushings (double-type or long-type) or oil-free bushings (for intermittent motions) should be selected to obtain linear stability and high load capability. |
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