18 Apr
2021
18 Apr
'21
7:40 p.m.
From: Fritz Mueller
I'm reassembling an PDP-11/34 in a BA11-K chassis
right now, and am a
little puzzled by the front mounting brackets (the ones that hold a
KY11-L of either sort on the bottom, and a half trim-panel on the top).
In particular, on the bottom half, the available place for screws to go
to attach the bracket to the chassis is nearly completely blinded by an
overhanging tab.
..
Anybody have an 11/34 in a BA11-K and care to take a peek and tell me
how the hardware here is properly configured?
Well, I have an KY11-LA mounted on a BA11-K; the KY11-LA and -LB use the
same bezel, and should have identical hardware.
There's an intermediate 10" or so high adapter piece (one either side, of
course) mounted to the KY11-L. (That's attached to the KY11-L with short
machine screws which are inserted from the rear, and go into tapped holes in
the KY11-L bezel.) That piece attaches to the BA11-K with different hardware
at the top and bottom: on the bottom, a single 1" or so machine screw (#8, I
think) goes through the vertical tab on the side at the front of the BA11, to
a tapped hole in the adapter piece. At the top, a pair of short countersunk
machine screws (#10, I think - definitely larger than the 1" machine screw at
the bottom) attach a pair (one each side) of those black plastic mounting
widgets which have a pair of balls on stalks; those go into holes on the back
of the blank panels, and those screw also hold the adapter piece to the
BA11-L at the top. (I looked for the DEC formal name for those pieces, but
couldn't find it.)
I'll get some pictures of the brackets I have, too
-- maybe they aren't
the standard/correct ones for an 11/34...
I'll take a look. I'm too burned out (COVID long haul) at the moment to take
pictures or do a drawing right at the moment; if needed, I can do it tomorrow
(or so).
Noel
PS: A while back you were after measurements on the KY11-L power knob;
did you ever get those: If not, I've got one, and can measure it.