> From: "Paul Schreiber" <synth1@...>
>
> Actually, when I "undig" in about 2 weeks I'll have
> the sheet metal shop quote a 12U "end buttable"
> rail with the small bend radius used on the 19A
> rails. These will have a wider back flange with
> countersunk holes for wood screws. You can line
> them up end-to-end as long as your heart's content.
I would be very interested in these rails. I agree that 12U end buttable
would be a decent length or maybe about 14U. I think it would be nice if
you could get the length to 1/2 the longest expected span. I mention 14U
because I recall that Dave B was going to be about 26 (maybe my memory
ain't so good). Could you get them to 14U without going to the expensive
brake?
I would NOT countersink the holes on the back flange. Some of these might
be bolted back to back instead of screwed to wood. Anyone wanting to screw
to wood can - 1:countersink them himself, 2: use sheet metal screws into
wood like a true American.
> The "problem" still remains about a 'double row'
> system without some flat board in-between to
> screw the rails to.
Actually, I don't see this as a problem. Each case builder may deal with
this in his own way. For me, I plan to have my multiple row (magic bus) in
between. However, even of a person only wanted to bolt two rows back to
back, it still works OK if you do the splicing correctly. Splice as shown:
upper row: = = = = = = = = = = = =s= = = = = = = = = = = =
lower row: = = = = = =s= = = = = = = = = = = =s= = = = = =
This shows how four 12 space rails could be spliced, cutting one of them
into two 6-space units causing the lower splices to be staggered from the
upper splice. The splice points would be user selectable based on width.
It would be cool if the mounting holes on the long flange side were in
multiples of unit width so they would line up for any varied width (one
every 1.75").
For Barlow, he gets by with 3 rails in the middle (sell them in pairs
though so he has to buy an extra one).
upper: = = = = = = = = = = = = = =s= = = = = = = 14+7
lower: = = = = = = =s= = = = = = = = = = = = = = 7+14
Three of the 14u rails with staggered splices gets 21 units wide. Of
course, I am making a dangerous assumption that the Curly stooge can
operate a metal saw.
And, of course, this still leaves open the "anything in-between option."
upper: = = = = = = = = = = = = = =s= = = = = = = = = = = = = =
tween:++++++++++++++++++++++++++++++++++++++++++
lower: = = = = = = =s= = = = = = = = = = = = = =s= = = = = = =
The "tween" stuff could be wood, or a horizontal multiple strip like I have
planned for mine. No jokes about "taint" here... OK.
> I could make a long (24U) flat piece with 2 horizontal
> rows (like 2 19As's welded together) and assume that
> the stiffness of the panels, coupled with screwed-in-wood
> top and bottom rails is sufficient to support 2 rows
> without "bowing".
I think that would work, but the flat bar would not be near as strong as
two rails bolted back-to-back like I have suggested above.
Stooge Larry