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Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307345 Tue Apr 16 2019 08:54 PM
Joined: Aug 2018
Posts: 268
2
2ManyTrucks Offline OP
Shop Shark
update on radio fun,
this morning i drove some of the steel chassis innards to the sandblasting / plating shops up in Oakland

started some cleanup work on the tuner unit
used Meguiar's ultimate polish to clean the dial face, i think it turned out very well
some parts had received a good layer of blue paint, i'm going to reuse the plastic part of the escutcheon because the aftermarket replacements don't allow an original dial face to fit.
(i find that in general reproduction plastic escutcheons won't fit most of the parts that need to go into them)

after carefully scraping off the paint and sun damaged parts, i was able to use boiling water to carefully straighten and restore the form of the original plastic
i'll repaint it with a wine/maroon color, it's not original to have paint, but it's in too rough of shape and color anyway
anyone wanting a more precise restoration would either have to work with the aftermarket plastics or use a better matched paint on this one
repainting this part would not require much effort
-s

Attached Files
tuner_unit.jpg (97.41 KB, 159 downloads)
dial_face.jpg (113.21 KB, 160 downloads)
dial_face_clean.jpg (73.02 KB, 160 downloads)
escutcheon_cleaning.jpg (82.25 KB, 165 downloads)
escutcheon_done.jpg (106.36 KB, 159 downloads)

1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307368 Wed Apr 17 2019 12:34 AM
Joined: Mar 2002
Posts: 8,902
truckernix Offline
Master Gabster
This is quite fascinating to see your work. Have you ever used an ultrasonic bath for this kind of work?


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Excellent, another radio to play with [Re: truckernix] #1307424 Wed Apr 17 2019 02:51 PM
Joined: Aug 2018
Posts: 268
2
2ManyTrucks Offline OP
Shop Shark
i don't have any cleaning apparatus, so far i have been using evapo-rust, soap, rubbing alcohol and manual labor.
i have though about getting some sort of small bench top device, would ultrasonic baths clean off surface rust? is it like a fancy rock tumbler?
i will go google this, i've thought about it before and i do have a couple dozen screws that need cleaning or replacement

any recommendations welcome
thanks
-s


1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307437 Wed Apr 17 2019 05:42 PM
Joined: Mar 2002
Posts: 8,902
truckernix Offline
Master Gabster
I haven't used one either. I think jewelers use them and hobby stores are selling them these days. That product Evaporust is amazing stuff. It attacks rust and leaves the other metals alone.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307518 Thu Apr 18 2019 02:55 AM
Joined: Aug 2018
Posts: 268
2
2ManyTrucks Offline OP
Shop Shark
I did some googling, and watched some YouTube about these ultrasonic cleaners, some folks swear they can remove rust with reasonable results with the correct cleaning solution
Based on what I saw on YouTube it should be a useful tool for cleaning dirt and grease at the very least, so I ordered one from amazon for under 100
It will arrive in a few days and I’ll post how well this China machine does.
-s


1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307633 Thu Apr 18 2019 10:40 PM
Joined: Aug 2018
Posts: 268
2
2ManyTrucks Offline OP
Shop Shark
progress... refurbishing the power/volume/tone switch
took it apart, cleaned all the bits, put a bit of fresh zinc onto some of the parts, re-assembled

the brass is stained because the oxidization reduced the alloy to just copper at the surface in some places
not sure the best way to make it look brass again, if i had a very fine wire brush i could probably polish until i'm at brass again
but it's in the bottom of the threads
suggestions?
-s

Attached Files
Pwr_Vol_Tone_switch.jpg (86.23 KB, 115 downloads)
switch_repair.jpg (53.02 KB, 117 downloads)
switch_parts.jpg (132.94 KB, 115 downloads)
switch_done.jpg (102.84 KB, 110 downloads)

1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307654 Fri Apr 19 2019 01:58 AM
Joined: Aug 2018
Posts: 171
D
drdoug Offline
Shop Shark
Maybe try Flitz polish on the brass? Will take some work to get down into the threads, but it works well to polish brass (among other things). I first used it when I was working as an electronics tech in grad school, to polish the internals (brass tubing) of an electron beam column in what would now be considered an antique scanning electron beam microscope. It was the only thing that allowed us to keep the internal structure clean enough to keep the beam focused, FWIW. Basically removes oxidation and leaves no significant residue if wiped off thoroughly. We used isopropyl alcohol for that. Nothing very exotic...

Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307923 Sat Apr 20 2019 08:54 PM
Joined: Aug 2018
Posts: 268
2
2ManyTrucks Offline OP
Shop Shark
i found some compounding paste and used a fine steel wire brush, the brass got reasonably better

also i got an ultrasonic cleaner on amazon, gonna test it out soon on some intricate tuner unit parts
in the mean while, please enjoy the tuner coil before and after photos smile

the center double coil halves had broken free from each they should be glued together so they can't move
i ended up rewinding the coil after all the brittle gyptal flaked off and the windings came loose
-s

Attached Files
switch_clean.jpg (163.07 KB, 81 downloads)
coils.jpg (104.04 KB, 83 downloads)
coils2.jpg (121.09 KB, 84 downloads)
coil_broke.jpg (66.23 KB, 84 downloads)
coil_fixed.jpg (80.41 KB, 83 downloads)

1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307947 Sat Apr 20 2019 11:49 PM
Joined: Aug 2018
Posts: 268
2
2ManyTrucks Offline OP
Shop Shark
the ultrasonic cleaner...
it works okay, but it won't remove everything
it did a reasonable job of this complicated part in the tuner unit, photos attached
i used only water and a bit of shampoo in the cleaning bath

i have two of this particular assembly, the other one is brighter and better looking, probably will go with the other one

maybe i should try baking soda or some stronger chemicals in the bath, i heard folks use evapo-rust directly in the cleaning bath
-s

Attached Files
dirty.jpg (106.79 KB, 71 downloads)
bath.jpg (107.68 KB, 77 downloads)
after.jpg (140.76 KB, 76 downloads)

1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1307951 Sun Apr 21 2019 12:42 AM
Joined: Aug 2018
Posts: 171
D
drdoug Offline
Shop Shark
By my experience, ultrasonic cleaners work great with weak solvents (isopropyl alcohol, methanol, that type of thing) for degreasing. Detergent solutions are fine, but with anything that is more aggressive, be cautious. They start etching pretty fast with mild to stronger acids, like evapo-rust. If you try those, go with short cleaning times initially, until you see how a particular solvent behaves with the parts that are being cleaned.

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