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ID roughness Differences
Feb 02, 2018

Without needing to know how to operate a particular machine to attain the desired degree of surface roughness ,there are certain aspects of all these methods which should be understood by the design engineer. Knowledge of such facts as degree of roughness obtained by any operation, and the economics of attaining a smoother surface with each operation, will aid him in deciding just which surface roughness to specify.

Because of its simplicity ,the arithmetical average Ra has been adopted internationally and is widely used. The applications of surface roughness Ra are described in the following paragraphs.

0.2um    The surface roughness is used for the surface of hydraulic struts, for hydraulic cylinders, pistons and piston rods for O-ring packing, for journals operation in plain bearings, for cam faces, and for rollers of rolling bearings when loads are normal.

0.4um  The surface roughness is used for rapidly rotating shaft bearings ,for heavily loading bearings, for rolls in bearings of ordinary commercial grades, for hydraulic applications, for the bottom of sealing-rings grooves, for journals operating in plain bearings ,and for extreme tension members.

0.8um  The surface roughness is normally found on parts subject to stress concentrations and vibrations, for broached holes, gear teeth, and other precision machined parts.

1.6um  This surface roughness is suitable for ordinary bearings, for ordinary machine parts where fairly close dimensional tolerances must be held, and for highly stressed parts that are not subject to severe stress reversals.

3.2 um  The surface roughness should not be used on sliding surfaces, but can be used for rough bearing surfaces where loads are light and infrequent, or for moderately stressed machine parts.

6.3um  The appearance of this surface roughness is not objectionable, and can be used on noncritical component surfaces, and for mounting surfaces for brackets, etc.

 

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