1. Rigid Box Construction
Apart from die cast boxes the usual way to provide small or medium size rigid enclosures is to use pieces of pre-
An alternative solution is to use four pieces of 1/4inch (6mm) square bar instead of the angle to hold the side sheets together. The bar is drilled and tapped 6BA (or M2.5 -
The choice of metal is down to the preferences of the individual constructor but aluminium is usually the easiest for home working and does not require surface finishing in the same way that steel does. 'NS4 -
If you want to finish the metal pieces, aluminium should be Alocromed which provides a protective coating which is electrically conductive (Anodising gives an electrically insulated coating).
I have used this technique to construct a box for a 5MHz VFO in a mobile/holiday rig with considerable success.