Posts: 855
Threads: 50
Joined: Feb 2013
City: Shenandoah,
State, Province, Country: Pennsylvania
Howard, did you reinsert that pin that I mentioned using a magnet to extract? I believe it is what finally holds the whole assembly together!
Ron
Bendix 0626. RCA 8BX5. RCA T64
Philco 41-250. Philco49-500
GE 201. Philco 39-25
Motorola 61X13. Philco 46-42 Crosley 52TQ
Philco 37-116. Philco 70
AK 35 Philco 46-350
Philco 620B. Zenith Transoceanic B-600
Philco 60B. Majestic 50
Philco 52-944. AK 84
Posts: 16,415
Threads: 571
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Ron
I am not sure he could make the assembly stay together in the first place.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 24
Threads: 2
Joined: Mar 2025
City: Puyallup
State, Province, Country: WA
Wow morzh, you have access to some very useful doc. That cross-section (Fig 2) is dynamite.
As you can see, if the ball wasn't attached to the vernier shaft, the shaft would simply back/fall out. Which is exactly what happens to mine now.
Starting tomorrow I'm gonna start calling some of these local Boeing fab shops that do the small custom fabrications. Even if they won't reattach it for me, they might tell me what the best method for doing so is.
Thanks.
Btw, here's a pic of a different '30s Philco radio fine tuning mech. It's a different model but they used the same method for implementing vernier control. Note the ball-end.
All-American Five Philco 54C – Part 5 – Philco Library
(This post was last modified: 03-16-2025, 03:58 PM by HowardWoodard.)
Posts: 24
Threads: 2
Joined: Mar 2025
City: Puyallup
State, Province, Country: WA
Hi Ron. Yes, I got it all back together the first time, after getting it all cleaned and lubed, and it was working really nice. It was while I was inserting the pin you refer to that holds the coarse shaft -- thus the entire assembly -- in place that the end-ball came off the vernier shaft.
Posts: 16,415
Threads: 571
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
I think that's the one I have in Philco 60, which I have recently fixed.
The last robodial radio repair (38-690) happened in 2017, and I simply forgot how I did that. I remember the pin did not want to come out.
But for the life of me I do not recall the ball at the end and what I did about it.
The end of the shaft then should be concave so the ball readily goes into it when glued.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 24
Threads: 2
Joined: Mar 2025
City: Puyallup
State, Province, Country: WA
It is concave and the balls rests in it about 25%-33% of the circumference of the ball. I'm just contemplating which would be the strongest option -- epoxy, super glue or silver solder -- before I put it back together.
Posts: 16,415
Threads: 571
Joined: Oct 2011
City: Jackson
State, Province, Country: NJ
Looking at the drawing, the ball should be glued well, as it seems that it rolling against the 3 other balls is what provides the planetary action. And the ball is probably a polished/plated metal, so not every adhesive will stick to it well.
Probably need to find out an adhesive specifically for it.
I wonder if it was too complex for them to machine the shaft such that it would have the ball-shaped end. Probably would be.
People who do not drink, do not smoke, do not eat red meat will one day feel really stupid lying there and dying from nothing.
Posts: 24
Threads: 2
Joined: Mar 2025
City: Puyallup
State, Province, Country: WA
I think you’re right about everything. A couple years later they were machining it out of a single piece of metal. Still had the issue of needing the end- ball to be hardened.
At any rate, needing to get the ball attachment right and knowing nothing about adhesives or metallurgy, I’m being deliberate.
As much as I enjoy re-lifeing things, if I run across a complete tuning shaft assembly or even just a complete vernier shaft, I’m gonna buy it.
(This post was last modified: Yesterday, 12:04 PM by HowardWoodard.)
Posts: 1,193
Threads: 49
Joined: Oct 2017
City: Allendale, MI
Are you sure that the flange at the end of the shaft isn't just completely worn off or bent over causing the indentation that looks like it should hold the ball bearing.? If I remember correctly on my 37-116's and my 38-116, the flange that pushed against the 3 ball bearings was machined in and the purpose of the ball was a bearing point for the spring to push against to reduce wear and friction. the picture you have of the AA5 shaft is the correct shape. The 3 balls may have frozen in the shaft and when the fine shaft was turned, it caused a lot of wear, eventually wearing the flange completely away.
Here is a photo of one from a Scott 16 where the fine shaft was worn out. I had to make a new one on a lathe. It works the same way. The spring pushed on a ball bearing which then pushed on the end of the fine shaft. The 3 ball bearings ride in the groove and are pushed against the flange. The outer housing (not shown) holds the ball bearings in place. As Morzh said, a planetary arrangement.
(This post was last modified: 03-16-2025, 11:05 PM by rfeenstra.)
Posts: 24
Threads: 2
Joined: Mar 2025
City: Puyallup
State, Province, Country: WA
As you might have already surmised, I’m not sure of anything. You raise a good question, and your pic gives it credibility. Did you make that shaft on your lathe? Pretty impressive.
In this case my guess is based on seeing another one from the same magnetic tuner that fits my guess.
(This post was last modified: Yesterday, 12:12 PM by HowardWoodard.)
Posts: 24
Threads: 2
Joined: Mar 2025
City: Puyallup
State, Province, Country: WA
Well, my epoxy didn't hold.
It looks like I'm stuck until I can locate another vernier shaft or tuning assembly. ... or find someone who can fabricate a replacement for me.
Posts: 1,193
Threads: 49
Joined: Oct 2017
City: Allendale, MI
I have a chassis for another 38-116. If I get a chance tonight (don't count on it!) I'll disassemble and see what's inside. If I can get to it, I'll take some pics.
Rob
Posts: 24
Threads: 2
Joined: Mar 2025
City: Puyallup
State, Province, Country: WA
That would be beyond great Rob. Fingers crossed...
Howard
Users browsing this thread: 1 Guest(s)
|
Recent Posts
|
Zenith H725
|
Thank you David - very helpful info.EdHolland — 06:09 PM |
[split] New member...
|
That would be beyond great Rob. Fingers crossed...
HowardHowardWoodard — 05:34 PM |
[split] New member...
|
I have a chassis for another 38-116. If I get a chance tonight (don't count on it!) I'll disassemble and see what's ins...rfeenstra — 05:30 PM |
Philco 37-9 Vernier Tuning Shaft Issue...
|
Well, my epoxy didn't hold.
It looks like I'm stuck until I can locate another vernier shaft or tuning assembly. ......HowardWoodard — 03:03 PM |
Zenith H725
|
Ed Have fun with the set have 2. The Selenium drops the voltage app 7 volts the 1n4007 drops voltage app 7/10 of a volt....David — 01:48 PM |
Zenith H725
|
Thanks, Mr Fix,
I found the schematic, and noted the hot chassis configuration and the selenium rectifier. Didn't kno...EdHolland — 11:52 AM |
1950 Emerson TV resurrection attempt
|
I believe I broke the wire when I was in there changing caps and such. The hum is a little puzzling. I can see it even i...TV MAN — 11:02 AM |
Philco 41 280 Floor radio-new project.
|
I second what Dale suggested.
Check the settings of whatever security software you have, or your OS settings.
They mig...morzh — 10:29 AM |
Philco 49-1040
|
Early Motorola TVs also didn't have fine tuning and only 8 channel positions. Your local dealer would set it up for you...Bob Andersen — 10:23 AM |
Philco 41 280 Floor radio-new project.
|
I kept getting a second party download intervention when I tried to access the schematic. Not sure what I did wrong?
...DaleHCook — 08:46 AM |
Who's Online
|
There are currently 2175 online users. [Complete List] » 1 Member(s) | 2174 Guest(s)
|
|
|

|