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The fixture illustrated here is used to test the strength of the bond between a wire loop and a substrate.
English (United States)
This text was extracted from a PDF file.
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100% of the total text.
Page 1 of 2
Fixture For Pulling Wire Loop Bonds
The fixture illustrated here is used to test the strength of the bond between a
wire loop and a substrate.
The substrate 1, with a wire loop 2 attached to it, is held by clamps 3 to a
horizontally movable stage 4.
The wire-pulling fixture 5 may be attached to a stressing device through the
use of a pin (not shown) passing through hole 6 in threaded rod 7.
By manipulating stage 4, the point at which the wire 2 is
affixed to substrate 1 can be positioned immediately beneath pointer
8 of the fixture. The body 9 of the fixture may be rotated on
threaded rod 7 until pulley 10 is in the same plane as wire loop 2.
Wire 2 is then placed in the groove 12 of pulley 10. Subsequent
rotation of the body 9 of the fixture can be prevented by tightening
lock nut 11. In order to insure equality of load on both legs of the
wire loop, pulley 10 is mounted on ball bearing 13. In order to keep
the entire fixture vertical, a counterweight 14 is also provided.
After the wire loop 2 has been placed in groove 12 of pulley 10, the wire loop
can be stressed by forces applied at the top of the fixture or from beneath the
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