6 Dec
2010
6 Dec
'10
9:12 p.m.
On 12/6/2010 12:21 PM, Tony Duell wrote:
We'll see how this works out with the glue. Fabricating replacement
parts might be a bit of an undertaking -- some of the fingers are like
the ones in my photos, a single, small plastic unit maybe a few
millimeters wide. I can see fabricating new ones, though they're small
enough that precision might be an issue. Others are part of a larger
set of fingers on a single "tube"of plastic maybe 6-8 centimeters in
length, these I suspect it will be difficult to replace.
Not really. The physical damage was such that the dent looked as if it
might actually be deep enough to be touching the delay line wire inside,
potentially dampening the pulses. I opened it up this evening (had to
gently hack off some rivets holding it shut) and gently hammered out the
dents in the aluminum enclosure. No difference in behavior after
reassembling it and hooking it back up, alas. But at least I can
eliminate that particular aspect as a problem.
I hope so. I'd guess that a machine like this, of this vintage, would
have such a manual. Not sure where to find one, though :).
- Josh
Interesting
suggestion. I'll keep it in mind. The good news is I
managed to (at least temporarily) fix most of the broken fingers -- I
found the broken off pieces of two of them stuck inside the mechanism
while cleaning it out, and they superglued back on very nicely. There
isn't a lot of force applied to these fingers, so hopefully they'll hold.
I suspect it would be OK for testing, but I wouldn't trust it if I was
restoring the machine (not evne if just for my own use). Some plastics do
degrade and turn brittle with time (the HP9800 keyboard bezles do, for
example), and I wonder if that's happeend here.
I would want to make new parts. I would use metal if there's no
requirement for them to be insulators, but that may be simply becuase I
have the tools to make such things.
I am not sure if a 3D pritner owuld peoduce a smooth enough part in
plastic for this. Worth a try if you have such a machine, I suppose. The bad news
is that even with the mechanism fixed, the machine still
exhibits the same problem. I'm wondering if it's the delay line memory
Other than the physical damage, do you have any reason to suspect the
delay line system at thiis point? up a service
manual.
Did such a thing ever sxist?
-tony