One more Mega-Rail concern
2000-02-01 by Paul Schreiber
While I've got my mechanical hat on...... There is one major "worry" about fixing the rails to the *top* and *bottom* surfaces. Tolerances of cutting the wood! See, in the current 19" scheme, the 2 "prongs" at the end of the MOTM-19As are wider than 'normal'. This allows each rail to "wiggle" in a vertical slop of about 0.075". This allows for panel accumulated tolerances (ie Joe Pavone's rack-o-MOTM) to be accounted for. What has me worried is that wood is not "precision machined" to 0.002 inches like the panels and rails are! So, I can see mucho problems with a *fixed* top/bottom rail (never mind Hendry's scheme of bolting 12 things in the middle). I can see the bottom set of panel holes, in the bottom rail being off with respect to the screwed-in bottom rail. The beauty of Moog's wood rails is "who cares?" As long as you allow slop in the *overall* inside "lip-to-lip" dimension, you are home free (remember, he used black *wood screws* to hold the modules into the *wood* rail). You start at the bottom, screw those in flush to the bottom board, and the top edge of the top-row panels fall "where-ever" (as long as they don't overlap the top edge!) Who cares if there is a 0.040 gap? You'll never see it! You *will care a great deal* if there is a 0.040" mis-match in the mounting holes and the tapped holes in the rails! I am beginning to see that having 2 strong (oak, kiln-dried pine) wood rails is looking good. Now, you *still* need the center bar to joing the rows to each other. BUT...that can be side mounted..... Paul S.