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17 October, 14:43

A sleeve made of SAE 4150 annealed steel has a nominal inside diameter of 3.0 inches and an outside diameter of 4.0 inches. It is pressed onto a solid shaft with a medium drive force fit. Specify the class of fit, dimensions for the shaft and sleeve, and calculate the stress in the shaft and sleeve after installation. Use the basic hole system. Is the design acceptable

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Answers (2)
  1. 17 October, 14:59
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    Class of fit:

    Interference (Medium Drive Force Fits constitute a special type of Interference Fits and these are the tightest fits where accuracy is important).

    Here minimum shaft diameter will be greater than the maximum hole diameter.

    Medium Drive Force Fits are FN 2 Fits.

    As per standard ANSI B4.1:

    Desired Tolerance: FN 2

    Tolerance TZone: H7S6

    Max Shaft Diameter: 3.0029

    Min Shaft Diameter: 3.0022

    Max Hole Diameter:3.0012

    Min Hole Diameter: 3.0000

    Max Interference: 0.0029

    Min Interference: 0.0010

    Stress in the shaft and sleeve can be considered as the compressive stress which can be determined using load/interference area.

    Design is acceptable If compressive stress induced due to selected dimensions and load is less than compressive strength of the material.
  2. 17 October, 15:10
    0
    Design is acceptable.

    Explanation:

    Class of fit: Interference (Medium Drive Force Fits constitute a special kind of Interference Fits and these are the tightest fits where accuracy is important).

    So, minimum shaft diameter will be larger than the maximum hole diameter.

    Medium Drive Force Fits are FN 2 Fits.

    As per standard ANSI B4.1:

    Desired Tolerance: FN 2

    Tolerance TZone: H7S6

    Max Shaft Diameter: 3.0029

    Min Shaft Diameter: 3.0022

    Max Hole Diameter:3.0012

    Min Hole Diameter: 3.0000

    Max Interference: 0.0029

    Min Interference: 0.0010

    Stress in the shaft and sleeve can be taking note of as the compressive stress which can be determined using load/interference area.

    Design is acceptable If compressive stress induced due to selected dimensions and load is less than compressive strength of the material.
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