MS3217C
Notes:
1. Unless otherwise specified, all dimensions in inches.
2. In the event of a conflict between the text of this standard and the references cited herein, the text of this standard shall take precedence.
3. Recommended design limitations and usage:
(a) Intended use - To provide large shoulders for positioning and retaining machine components under heavy loading conditions on shafts, even if components to be secured have large corner radii or chamfers abutting the rings. They withstand comparatively heavy shock loads and high rotational speeds. They eliminate the need for separate thrustwashers. The use of the following formulas
are based on the fact that the ring will not fail in compression.
Limitation on use - the following formulas are not to be used for brittle materials such as cast iron, etc.
Warning - Rings shall not be over expanded during installation since this will lead to ring failure. If ring has play between the groove diameter and the inside ring diameter, this indicates that the ring has been over expanded, (providing groove has been machined to recommended dimensions).
For approximate safety RPM limits see Table IV.
TABLE IV. Calculated RPM limits. Apply required safety factor.
0 SHAFT (INCHES) |
.394 |
.437 |
.500 |
.750 |
1.000 |
1.250 |
1.500 |
1.750 |
2.000 |
|
CARBON STEEL AND CORROSION RESISTANT STEEL |
RPM LIMIT |
80,000 |
69,000 |
65,000 |
40,000 |
30,000 |
23,000 |
18,500 |
15,500 |
14,000 |
BERYLLIUM COPPER |
RPM LIMIT |
51,000 |
44,000 |
41,000 |
26,000 |
19,000 |
14,500 |
12,000 |
10,000 |
9,000 |
(b) Allowable thrust load capacity of the ring. Abutting components to have sharp corners =
P = Cf STX F
Where:
P = 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, F = 4 is recommended to insure a
safe working load
Cf = Conversion factor, CF = 1.3 is required since thicker rings increase safety of assembly
(c) Allowable load capacity of groove wall =
P = Cf SdY F
Where:
P = Allowable compression load (Pounds) S = Shaft diameter (Inches)
d = Groove depth (Inches)
Y = Yield strength in compression of the groove material (PSI) F = Factor of safety, F = 2 is recommended to insure a safe
working load
Cf = Conversion factor, CF = 2 is required since contact area in groove is increased due to thicker ring
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