speaker assembly follow up, i'll make two post today so i can put up more photos
material list:
original speaker parts all cleaned up
Devcon 18045 contact cement
Devcon 20445 5min 2 part epoxy
VC3000-4 - mylar/paper voice coil 1.000 ID, 4 ohms
CS2171-C - spider cup 2.171 OD, 1 inch VC, 0.197 height
W438001 - 6x9 cone
DCP1100 - 1 inch dust cap (1.100" with down lip)
R6X9 - mounting gasket for standard 6x9
PIGTAIL and SHIM KIT - included with most orders from the Speaker Exchange, these are the super flexible lead wires from the voice coil to the speaker terminals, and the shim kit has plastic card stock of various thicknesses to use instead of paper when spacing the voice coil onto the post.
The Speaker Exchange website has a good DIY section with photos on how to rebuild speakers. I had no idea how to rebuild speakers before a couple years ago, i just knew it was a thing that could be done, I've followed their guides and so far they all turned out great.
https://reconingspeakers.com/faq/how-to-guides-2/……..How To DIY Recone with Unassembled Parts — most brand parts
What's specific to these Electro-Dynamic speakers is mostly the details of the field coil. I used more of the black friction tape as i did on the speaker transformer to wrap the field coil where it had lost the crumbling paper wrapping. Glue the ends of the tape with cyanoacrylate to keep it from unwrapping. The field coil slides in with it's copper plate and cardboard shims, then you press the steel pole piece back in from the front side of the speaker. The pole originally was a few thousands of an inch proud of the rear side, to get it there I first press it flush on the steel bed of the arbor press. Then the tricky parts comes in, the pole gap must be uniform, so measure it with a round rod/drill bit or any measuring stick of choice to check for uniformity. Assuming it's not prefect by luck this next step is how you center it and get the pole driven a tiny bit further into position.
With solid cardboard or leather supporting the speaker use a 1/4 inch steel punch and tap off center on the pole next to where the gap is largest.
This action drifts the pole closer to the side you are tapping off center, closing the gap next to the punch (and opening the gap on the opposite side).
Tap a bit and measure often, eventually you will get the hang of it and the pole piece will be reasonably centered.
If it all goes bad, press it out and start again. If the pole is too loose, put a few dimples on the end that presses in and start again.
There should be virtually no limits to how many times you can repeat this step to get it right.
Always test fit the parts before attempting glue or epoxy. The DIY guides cover the order of assembly quite well, but if you are not certain, plan it out yourself so that you know how all the steps will go before you start. I like to go slow, I leave the glue and epoxy cure overnight for a couple of the assembly steps.
-stan
