Envision Plastics Expert Announces Part Seven in the Series: How to Design Plastic Enclosures Using NMR Technology

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NMR Technology (No Molds Required) is a technology Envision Plastics and Design uses to manufacture custom plastic electronic enclosures with no tooling or molds. Since it’s a unique plastic fabrication process, some forethought goes into the design criteria to make an economical plastic enclosure.

As long as the radius is supported by two permanent solvent welded end caps, internal supports, or other means, curves of select radii dimensions can be done.

The last installment on NMR mechanical design was in regard to solvent welding. Now that both the NMR forming process and NMR solvent welding process has been outlined, a critical product feature required on some housings can be discussed – curves and radii using NMR Technology.

First off, edge radii are not difficult with respect to breaking an edge. This is simply done and applied at a hand router machine. The more difficult curves are those which span over several inches. Plainly stated, the smaller the required radii, the more difficult it is to produce with NMR.

Radii in multiple planes are not possible with NMR. This is due to the fact that all curves like this are cold formed. In the NMR bending process, edges are heat bent, but that is all. The other forms (radii) are done by hand. Once they are brought to the correct position, the assembler may put the part in a fixture or may apply an end cap and solvent weld it to the curved piece – then place it in a fixture to help the part cure in its desired shape. As long as the radius is supported by two permanent solvent welded end caps, internal supports, or other means, curves of select radii dimensions can be done. In addition, to complete some curve call-outs, it may be necessary to mill small recesses in the backside of the material to remove some rigidity when trying to achieve a desired radius.

To conclude, applying curves to NMR fabricated enclosures is a case by case basis that depends on material type, thickness, and general construction methods of the plastic enclosure as a whole.

In the next installment, additional assembly options will be identified and explained. Stay tuned!

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Brian DuFresne
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