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Rules of Thumb for Mechanical Engineers Episode 7

Tham khảo tài liệu 'rules of thumb for mechanical engineers episode 7', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 170 Rules of Thumb for Mechanical Engineers Table 17 Selection of Housing Tolerance Classifications for Metric Radial Ball and Roller Bearings of Tolerance Classes ABEC-1 RBEC-1 DESIGN AND OPERATING CONDITIONS TOLERANCE CLASSIFICATION i Rotational Conditions Loading Other Conditions Outer Ring Axial Displaceability Outer Ring Stationary in relation to load direction Light Normal or Heavy Heat input through shaft Outer ring easily axially displaceable G7 3 Housing split axially H7 2 Housing not split axially H6 2 Shock with temporary complete unloading Transitional range 4 J6 2 Load Direction indeterminate Light Normal or Heavy Split housing not recommended K6 2 Heavy shock M6 2 Outer Ring Rotating in relation to load direction Light Normal or Heavy Outer ring not easily axially displaceable N6 2 Heavy Thin wall housing nót split P6 2 1 For cast iron or steel housings. Numerical values are listed in Table 18. For housings of non-ferrous alloys tighter fits may be needed. 2 Where wider tolerances are permissible use tolerance classifications H8 H7 J7 K7 M7 N7 and P7 in place of H7 H6 J6 K6 M6 N6 and P6 respectively. 3 For large bearings and temperature differences between outer ring and housings greater than 10 degrees c F7 may be used Instead of G7. 4 The tolerance zones are such that outer ring may be either tight or loose In the housing. Source ANSI AFBMA std. 7-1988. Table 18 Housing Fitting Practice for Metric Radial Ball and Roller Bearings of Tolerance Classes ABEC-1 RBEC-1 Plrt II Deviations and Fits in 0.0001 Inches Bearing O.D. D TOLERANCE CLASSIFICATIONS F7 G7 H8 H7 H6 J6 J7 K6 K7 M6 M7 N6 M7 PS P7 Hariri Rud- Hariri M Hariri Retd- HasM Real- Hariri tad- Heeriri IM- Hariri Real- Mr Rad- Heeriri Jpd- Mri M Hariri Had- Hariri Real- V iii y Real Hariri Dari- Hariri Rad- ww ria IM- tad Deri- M Ort tat Deri- tael Deni- tad Deri- M Ont- taf Deri- tai Oeri- tat Out tat Deri- tut Ont tat Ont- tad Deri- tat Delta- tat dla fit ria fit atm fit ria fit ria fit Itofl H