Dear Search Engineer: I'm looking for a method to bond Tivar together. Right now, we currently wrap the edges of each piece of Tivar with angle iron, but are searching for glue or another compound to bond Tivar together using butt joints. —D.L., WI
Dear D.L.: The most common method used to join Tivar 1000 UHMW Sheet is by welding. The material is chemically resistant and resists solvents and adhesives. UHMW is available in thicknesses of 0.125 inch and thinner, and comes with an adhesive applied to one side. Tivar 1000 UHMW can also be produced on a custom basis with a canvas or rubber backing applied during manufacture. The canvas or rubber then becomes your bondable surface. In addition, there are a couple companies that offer adhesives including 3M's Scotch Weld, which can be heat or solvent activated. Dielectric Polymers (http://rbi.ims.ca/3852-511) manufactures unsupported pressure sensitive transfer adhesives that may be effective for bonding Tivar.
D. Kirby asks: I'm developing a sealed data storage chassis that weighs about 75 lbs. I'm looking for a way to mount the chassis inside an unmanned aerial vehicle (UAV) onto a composite mounting plate, from under the UAV. In other words, the unit must be mounted in the Z axis relative to the vehicle, and remain secure under extreme flight conditions (i.e., temperature, vibration, shock). It would be advantageous if some sort of guide system and locking mechanism were employed to assist the one-man installation. Any pointers?—D.K., NM
Dear D.K.: Take a look at Loctite H8000 (for composite-composite bonding) or H4500 (for metal-composite building). To find out more technical information about these adhesives, go to http://rbi.ims.ca/3852-512 and type in H8000 or H3151 under the "Technical Data" section of the website.
Dear Señor Search Engineer: I'm looking for a small footprint sensing device that would detect rotational movement of a ¼-inch shaft as it is turned by a 5-inch hand wheel on one side. The output has to be a variable resistance or pulse so that a hot air blower's cfm can be controlled by it. The blower cfm is directly proportional to the speed at which the hand wheel is rotated with zero output when the shaft is stationary. —C.C. in PR
Hola C.C.: The measurement of rotational movement of shaft can be done with the help of photoelectric sensors connected to programmable logic controllers. Programming can be done in the PLC according to your needs. The retroreflective sensor can serve your purpose since some sort of reflective device is to be fitted on the shaft. On the rotational movement of shaft the sensor will give pulses, which can be calculated by PLCs and the blower can be controlled by the same PLC. You can also consider an off-the-shelf solution, such as motor speed controllers that you could configure to respond to pulse frequency. The pulse generator would be connected to the hand crank and would transmit a pulse frequency proportional to the shaft rotation speed.
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