Changing the Location of Mounting Bosses

November 30th, 2009

 

Standard mounting bosses are molded into our plastic electronic enclosures, placed according to standard application dimensions. However, unique enclosure applications sometimes require boxes to be mounted in non-standard locations. This, in turn, requires the locations of the mounting bosses to be customized to accommodate where the enclosure will be mounted. Requests from our customers to have mounting bosses moved to specific locations are common, and they raise an important question about our capabilities here at Polycase. Can Polycase’s standard enclosures be equipped with custom placed mounting bosses? The brief answer to this question is: yes, absolutely.

The longer answer is a bit more in-depth. Because we do not offer custom molds, mounting bosses cannot be molded directly into custom locations. Instead, we offer an easy solution, which can be far more cost-effective than ordering custom molds, particularly for shorter runs. This solution has three main steps:

Polycase can machine the required countersunk holes in the specific locations requested.

Polycase can machine the required countersunk holes in the specific locations requested.

Removing standard mounting bosses. Mounting bosses are built directly into the enclosure mold, and although the mold cannot be changed, the bosses can be removed. We can remove mounting bosses one of two ways, depending on the type of series being molded and customized. The bosses can be excluded during the molding process, or they can be machined out after molding, using CNC milling.

You assemble your stand-offs into the enclosure and mount your PCB.

You assemble your stand-offs into the enclosure and mount your PCB.

Applying countersunk holes to custom mounting boss locations. Once standard bosses have been removed, we machine countersunk holes into the new custom boss locations so that new bosses can be attached. This allows the customer to easily assemble new bosses in their required locations.

Very quickly and easily your PCB fits perfectly!

Very quickly and easily your PCB fits perfectly!

Assembling stand-offs to new boss locations. After we have supplied the plastic enclosures with custom boss holes, the customer purchases and assembles  correctly-sized stand-offs which act as mounting bosses. Although we do not supply standoffs, we recommend Keystone Electronics (www.keyelco.com) as a supplier; #4-40 is the typical size for standoffs, but other sizes may be used as well. Customers can consult with a Polycase engineer to determine which standoffs will best fit the customized enclosure.

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