British Standard Commercial Frame Bottom Bars
Tolerances are + 0.1mm
Material...Most softwoods are suitable.
Like all wooden frames there are many variations... The
types illustrated below are the most common.
I do not recommend the 8 mm x 6 mm version as it is too
flimsy and can warp badly. The twin Manley type is probably the most
common, certainly I was asked for them most often when I was in the
equipment supply business.
there is a 22 mm wide single version that is similar in all
other respects to the one at the bottom of the drawing.
Written... June 2001
Revised... 31 December 2001