Ron(UK) wrote in message
...
N Cook wrote:
Ron(UK) wrote in message
news
N Cook wrote:
The 0.08mm thick aluminium dome must have been press-formed (or that
very
hands-on turning type process that I forget the name of) with a
cylinder
extension to the dome and the cylinder section is glued to the inside
of
the
VC former.
Spinning perhaps?
So had to cut around the dome to remove and have to hope the
final gluing-back holds up against the air pumping process.
That`s partly why there`s a hole through the magnet, some speaker
manufacturers put a hole in the dome. If the original dome is damaged,
Wembley Loudspeakers will sell you one. If you're worried about
cosmetics, fit a larger dome to hide the remains of the old one.
I'm thinking of some golf tees in the rim mount holes to give sliding
alignment with the holes in the periphery of the cone on re-assembly.
Just line it up properly in the first place 
Ron(UK)
--
Lune Valley Audio
Public Address Systems
Hire Sales Maintenance
www.lunevalleyaudio.com
Yes metal spinning.
Golf tees are too small but 4 ball point pen barrels temporarily glued
to
the extreme rim should be ideal as a nice sliding fit with the cone. I
will
add black dyestuff to the glue to fix dome back. Dome and inner edge of
cone
masked off close to the glue/cut line, with tape, should be neat enough.
I'll just have to make sure its pastey enough not to drip inside,
through
the scalpel cut line.
No need, just run a bead of clear bostik around the dome in one
operation, and it`ll look like it`s never been apart. you`ll probably
damage either the cone or the dome pulling the masking off. And dont
worry too much about the rim holes being in perfect alignment, new
cones don't even have the holes when they are supplied. You make them
later with a scalpel. In fact, some new speakers don't have the holes in
the paper, some give you a choice of mounting holes.
Ron(UK)
In the end I just used the pens with some clothes pegs to give a bit more
clearance gap for laying down the glue. Removed them prior to dropping the
cone in case they gave some bias.
Cone and spider glueing process complete, now a wait for a couple of hours
before removing the shims.
I'm just wondering how much the "monocoq" construction of the Ali dome plus
cylinder gives circular stiffness/precision, that my cutting it has
destroyed.
--
Diverse Devices, Southampton, England
electronic hints and repair briefs , schematics/manuals list on
http://home.graffiti.net/diverse:graffiti.net/