MS3215C
TABLE IV. Calculated RPM limits. Apply required safety factor.
0 SHAFT (INCHES) |
.125 |
.188 |
.250 |
.375 |
.500 |
|
CARBON STEEL AND CORROSION RESISTANT STEEL |
RPM LIMIT |
70,000 |
50,000 |
38,000 |
28,000 |
20,000 |
BERYLLIUM COPPER |
RPM LIMIT |
45,000 |
32,000 |
24,000 |
18,000 |
13,000 |
(b) Allowable thrust load capacity of the ring. Abutting components to have sharp corners =
P = πSTX
3F
Where:
F = Allowable thrust load (Pounds) S = Shaft diameter (Inches)
T = Ring thickness (Inches)
X = Ultimate shear strength of the ring material (PSI) 1/ F = Factor of safety
A safety factor, F = 3, is recommended, since the ring under load is subjected not only to shear stresses but also to bending stresses
(c) Allowable load capacity of groove wall =
P = πGdY
3F
Where:
F = Allowable compression load (Pounds) G = Groove diameter (Inches)
d = Groove depth (Inches)
Y = Yield strength in compression of the groove material (PSI) F = Factor of safety
To insure a safe working load a safety factor, F = 2, is recommended.
(d) Minimum distance between outer groove wall and end of shaft =
Z = 2d Where:
Z = Minimum distance between outer groove and end of shaft (Inches)
d = Groove depth (Inches)
1/ X = 100,000 PSI ultimate shear strength for rings .015 thick of carbon steel or corrosion resistant steel.
X = 120,000 PSI ultimate shear strength for rings .025 thick of carbon steel or corrosion resistant steel.
X = 150,000 PSI ultimate shear strength for rings over .025 thick of carbon steel or corrosion resistant steel. X = 110,000 PSI ultimate shear strength for rings of all thicknesses of beryllium copper.
(e) Differential rotation =
The condition under which a retaining ring may be used when adjacent parts rotate relative to it, fall into two categories:
(1) Where no thrust is exerted by adjacent part, in this case, differential rotation of ring and adjacent part creates no element of risk in the application of the rings because no frictional torque is exerted by the machine part on the ring.
(2) Consideration must be given to the magnitude of the thrust involved. The friction moment may not exceed the bending moment, which the ring can tolerate without releasing its pressure against the bottom of the groove, formulated as follows:
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