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Basic test block sketch |
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Dowel Shear Tests |
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Test to confirm shear strength of each pin/sleeve size. |
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Test method - Retain pin in a three block assembly, center block designed to move downward
through assembly, side support blocks retain pin/sleeve assembly in a horizontal position. Recorded tonnage will show double the amount due to shear condition on both
sides of cutting block. All blocks are A2 tool steel heat treated to Rockwell 62-65 RC. Pins are random samples from inventory. (Note - the slot in the sleeve was
positioned horizontal during test). |
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| SIZE |
SAMPLE 1 POUNDS |
SAMPLE 2 POUNDS |
| EX-250 |
14,000 |
13,850 |
| EX-375 |
31,400 |
32,800 |
| EX-500 |
56,500 |
57,250 |
| EX-625 |
88,250 |
95,250 |
| EX-750 |
126,500 |
126,500 |
| EX-1000 |
220,000 |
220,150 |
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Vibration Tests |
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Test of eight each of the EX-375 and EX-500 |
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Test was conducted by Bell Aerosystems Company |
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A pair of each pins were installed in each of the test unit assemblies.
The test units contained the following materials
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| TEST UNIT |
MATING BLOCK MATERIALS |
| No. 1 |
Cast Iron |
Cast Iron |
| No. 2 |
Cast Iron |
Tool Steel |
| No. 3 |
Machined Steel |
Tool Steel |
| No. 4 |
Machined Steel |
Machined Steel |
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| RESULTS Each unit was
vibrated a total of 140 minutes. Dimensional checks made during and at the conclusion of the test indicated that none of the expanding dowel pins had moved from
their installed positions. Removal of the pins from the test blocks was easily accomplished using the pin extractors provided. |
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Apparatus and Method
The four test block assemblies were bolted to the head of an MB Electronics Model C25A vibration machine to provide vibration along the
longitudinal axis of the dowel pins. Vibration input was monitored by an MB Type 124 pickup bolted to the vibrating head adjacent to the test units. The vibration
schedule consisted of seven constant octave frequency sweeps from 5 to 500 to 5 cps in 20 minutes. Between 5 and 40 cps, the applied vibration was maintained at
0.35 inches double amplitude and from 40 to 500 cps at a constant peak acceleration of ± 25 g's. |
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Prior to, during, and after the test, the position of each dowel pin relative to the test block face was determined with a depth micrometer. |
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S. B. Whistler & Sons, Inc PO BOX 207, Akron, NY 14001 USA
US / Canada 1-800-828-1010 Outside
1-716-542-4141 Fax 1-716-542-4226
© 1998 - 2008
SB Whistler & Sons, Inc. All rights reserved. Privacy
Policy Statement Last
updated 03.05
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