Assembly - Edward Farrell Jeremy Davia Jason Fox Assembly:...

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Edward Farrell Jeremy Davia Jason Fox Assembly: Before you can even begin the assembly of a foil-type strain gauge, you must first be aware of the safety precautions. During the assembly, a bonding agent called super- glue will be used to bond the gauge to the aluminum beam. This super glue is adhesive to many materials including skin and eyes so care must be taken if using bare skin during application. When starting the assembly procedure, all surfaces were smoothed and cleaned, as to make the most suitable bonding surface. First, the strain gauge was positioned and bonded in the center of the beam on the top surface. Next, the gauge was picked up with some cellophane tape and aligned to where it was to be mounted. Glue was applied gauge was adhered while being held down with an eraser. After that, a strip of masking tape was put under the gauge wires as to keep them from contacting the beams surface. Lastly, a solder pad was glued next to the masking tape and then the gauge wires and lead wires were soldered to the pad. Testing Method: In the testing, the gauge was secured to the desk and the lead wires were connected to a full Wheatstone bridge configuration. The bridge was excited by a 10.0V power source. Due to unstable readings that may have been due to potential overheating of the gauge wires, the voltage was decreased from 10V to 5V. The bridge was also connected to a multimeter that measured the differential output voltage of the Wheatstone
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Testing with plate, but not stacked y = 139.81x + 871.6 R 2 = 0.9223 0 200 400 600 800 1000 1200 1400 1600 1800 0 1 2 3 4 5 6 Vdiff 1 uV Linear (Vdiff 1 uV) bridge. The first tests included stacking the weights on the unsupported end of the beam. This was a challenge because large, heavy weights had to be stacked on a 1”x3/4” platform. The second test was with an aluminum 2”x 2” platform screwed into the unsupported end. This was much easier because the weights could be spread out and did not need to be dangerously stacked. However, some peculiar readings were observed
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This note was uploaded on 04/08/2008 for the course ELMC ? taught by Professor Villanucci during the Spring '08 term at Wentworth Institute of Technology.

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Assembly - Edward Farrell Jeremy Davia Jason Fox Assembly:...

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