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Construction: Box Assembly |
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| The main part of the rifle
consists of the aluminium channel and two plastic component boxes. The
boxes are available in a large range of shapes and sizes. These are
perfect for mounting PCB's speakers's and batteries. The main box in this
case houses the 27mm mylar speaker as well as the lock-on PCB, screw
terminals and PCB stand offs. The box measures 40mm wide so it is a
perfect fit against the aluminium channel!
I use another box to house the 2 'C' size batteries, this is smaller and has no screw holes to hold the box together. Basically what you need to do is to join the two halves of each box together, so that half of the grey box is joined to half of the black box, this creates a single piece for holding all of the important stuff.
A pair of small bolts are sufficient to hold the two halves together. Align and mark the position of the black box on the grey one, getting it as near centre as you can. Drill holes through one piece and then line that up to the other half, mark the position and drill two more holes. Both halves will then be able to join together as a single piece and are ready for the next step.
In order to join the box assembly to the channel, two aluminium angles will need to be cut the same length as the main enclosure. I used 12mm X 12mm X 1.4mm aluminium angle for the joining pieces. Ensure that the holes for the screws are staggered so that they do not run into each other.
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 Angle is screwed onto top of enclosure box. |
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 Channel is screwed to the box assy. |
