Metric Module Involute Splines Machinery's Handbook, 31st Edition
2357
π m
c F
0.5 π m Internal Spline
0.5 π m
rfi = 0.4m Min.*
0.9m
0.9m 0.5m
30°
External Spline Reference Line
*If full radius is smaller, use full radius
Min h s = 0.6m Min h F = 0.1m
rfe = 0.4m Min.*
Fig. 6b. Profile of Basic Rack for 30 ° Fillet Root Spline
π m
0.5 π m Internal Spline
0.5 π m
c F
rfi = 0.3m Min.
0.7m
0.7m 0.45m
37.5°
External Spline Reference Line
Min h s = 0.55m Min h F = 0.1m
rfe = 0.3m Min.
Fig. 6c. Profile of Basic Rack for 37.5 ° Fillet Root Spline
π m
c F
0.5 π m Internal Spline
0.5 π m
0.6m rfi = 0.25m Min.
0.6m 0.4m
45°
External Spline Reference Line
Min h s = 0.5m c F = 0.1m
rfe = 0.25m Min.
Fig. 6d. Profile of Basic Rack for 45 ° Fillet Root Spline British Standard Straight Splines.— British Standard BS 2059:1953, “Straight-sided Splines and Serrations,” was introduced because of the widespread development and use of splines, and because of the increasing use of involute splines it was necessary to provide a separate standard for straight-sided splines. BS 2059 was prepared on the hole basis, the hole being the constant member, and provided for different fits to be obtained by varying the size of the splined or serrated shaft. Part 1 of the standard deals with 6 splines only, irrespective of the shaft diameter, with two depths termed shallow and deep. The splines are bottom fitting with top clearance. The standard contains three different grades of fit, based on the principle of variations in the diameter of the shaft at the root of the splines, in conjunction with variations in the widths of the splines themselves. Fit 1 represents the condition of closest fit and is designed for minimum backlash. Fit 2 has a positive allowance and is designed for ease
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