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Time to tackle the H-3 speaker with open field coil.
[Image: https://live.staticflickr.com/65535/5168...ae3e_c.jpg]
The cone came out much easier than I expected
After removing the screws around the rim, I just needed a little persuasion with a razor blade around each screw hole. No acetone require. I'm not sure if the re was no glue or it had failed over the years.
The only tricky part was the spider. There I did use a few drops of acetone and a small plastic pry bar to loosen it up.
[Image: https://live.staticflickr.com/65535/5168...1639_c.jpg]
Now, I just need to whack this out. Wish me luck.
[Image: https://live.staticflickr.com/65535/5168...61d9_c.jpg]\
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Well this setup is getting me nowhere. Should I be whacking it from the other side?
[Image: https://live.staticflickr.com/65535/5168...ca6a_c.jpg]
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Ah-ha. This thread set me straight.
https://philcoradio.com/phorum/showthread.php?tid=3938
I'll check with some local machine shops.
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Perhaps a gear puller would work ?
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It takes a mighty force to push that pole out, I don't think a gear puller will do it. A few years ago I rewound one of these K speaker field coils. I made a hydraulic press using a 12 ton bottle jack and 4x4 wood pieces for the frame.
Steve
M R Radios C M Tubes
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I found the thread about that speaker
Philco 70 Cathedral Speaker (philcoradio.com) There are a couple of photos of the press.
Steve
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Oof, I see what you mean. Thanks for the link and photos.
Did you use the same jig to reinsert the pole ?
(This post was last modified: 11-19-2021, 01:12 PM by
Bob Andersen.)
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Yes, reassembly is just the reverse process. Notice the portion of the pole that presses into the frame is much smaller than the rest of the pole. This creates a large shoulder, that when pressed back in tight to the frame, will perfectly center the pole.
Steve
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(This post was last modified: 11-19-2021, 04:27 PM by
Steve Davis.)
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I use my log splitter. It has a 38-ton ram. Very easy. You can use a large socket to support the frame as you push the pole out.
"I just might turn into smoke, but I feel fine"
http://www.russoldradios.com/
(This post was last modified: 11-20-2021, 11:06 AM by
Phlogiston.)
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Hello bob,
luckily you got that far !
nice Job so far and Russ that is using your brain a Log splitter who would think of that !
Sincerely Richard
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Hi Bob...been following the YouTube series with great interest. I have the middle of the production run model 90 chassis with the single 47 in a lowboy cabinet that I restored to like new condition. I'm an electronics novice having restored 4 1903s-1940s Philco radios. You and shango66 have been my inspiration. I have followed your 90 restoration step by step and have run into some difficulty. For now...just a hello! It's a thrill to find you on a message board!
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Hi. Whenever I work on a Philco, I post here along with making videos. This Phorum is an invaluable resource and I'm grateful for the support and knowledge I've received.
As for the speaker, I plan on picking up a 6-ton shop press. Probably from Harbor Freight if I can find one in stock in my area.
Basically, the same as the jig Steve put together. I'm sure I'll find other uses for it to justify the investment.
https://www.harborfreight.com/6-ton-a-fr...-1666.html
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I loved your little explosion and chuckle this morning..."POOF...whoa....heh heh!"
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I spent Black Friday morning driving to several Harbor Freight locations only to learn that there are no presses within 100 miles. Also, they would not sell me the floor model and had no date when they might restock.
Well, I wasn't going to drop $140 to have one shipped to me so I went back to plan A and got a bigger hammer.
I also heated the frame with a propane torch. With the frame supported by a couple strategically placed concrete pavers I went to work.
I used some sacrificial metric sockets carefully centered. The first few hits didn't do much. The pole appeared to be mushroomed - either when it was made or from my earlier attempts.
I was about to give up when I realized the pole had moved a tiny bit. That encouraged me to whack it even harder and finally it got passed the mushroomed end. Then it was just a couple light taps to get it fully out.
The pole seemed about as hot as the frame so I'm not sure it made any difference. However, when I go to reassemble, I will put the pole in the freezer and heat the frame.
Not exactly how I thought I'd be spending my day off, but I'm glad it's done
[Image: https://live.staticflickr.com/65535/5170...24a0_c.jpg]
(This post was last modified: 11-26-2021, 09:31 PM by
Bob Andersen.)
