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Mechanical methods include techniques such as screw
fastening, riveting, or snap-fits which employ a fastener or
physical means of part assembly. These techniques are used
for applications requiring non-destructive disassembly or
rapid assembly with low capital investment. Unlike other
fastening methods, these techniques are readily used for
joining all materials, including metals. Plexiglas acrylic
resins may be joined with themselves or other materials,
providing appropriate design considerations have been
taken.
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Accumulation of material, not only in
walls, but at joints and corners should be avoided by coring
out. Good practice aims at minimizing risk of sinkmarks,
voids and deformation in the design process.
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Snap-fit assemblies must be designed
within the elastic limitations of the materials employed.
The following formulas may be used to estimate the percent
deformation of Plexiglas acrylic resin for a given
design.
For Cantilever: e = d/(0.67 x
l2/h)
For Bush Fit: e=(d1-d2)/d1 x 100
ß angle range for a dismountable system =
40-50°
ß angle range for an undismountable system > or =
50°
a angle
should be between 20° and 30°
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