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Vintage Radio (domestic) Domestic vintage radio (wireless) receivers only. |
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7th Jul 2019, 9:51 pm | #1 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Plastic cog needed
Hi
I am repairing a Panasonic radar radio with auto tuning! Has a motor which drives through a gearbox the variable capacitor. When a station is found it stops. The centre gear has split. I have tried gluing with special plastic super glue without success. I have attached pics showing the dims, does anyone know where I might get one please? It's a D shape shaft it sits on. Cheers Pete |
7th Jul 2019, 9:59 pm | #2 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
For some reason I can't upload more than one pic ?
If I add more it just uploads the last added ? |
7th Jul 2019, 10:26 pm | #3 |
Dekatron
Join Date: May 2010
Location: Greater Manchester, UK.
Posts: 18,676
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Re: Plastic cog needed
I can see references to Panasonic Radar Matic, is that what it is?
What's the actual model number?
__________________
-- Graham. G3ZVT |
7th Jul 2019, 10:33 pm | #4 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
Hi Graham
Panasonic rf 880 |
8th Jul 2019, 8:49 am | #5 |
Dekatron
Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 3,315
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Re: Plastic cog needed
Try a model shop for a gear but it won't have the D shaped hole - you'll have to file that to suit. take the old one with you to test for size and tooth fit.
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8th Jul 2019, 10:45 am | #6 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
Sorry it's 17 teeth .One has broken off !
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8th Jul 2019, 12:38 pm | #7 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,637
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Re: Plastic cog needed
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8th Jul 2019, 12:44 pm | #8 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
I'm using an iPad
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8th Jul 2019, 1:19 pm | #9 |
Pentode
Join Date: Jul 2013
Location: Wilmslow, Cheshire, UK.
Posts: 209
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Re: Plastic cog needed
Hi Goldenoldie,I found a very good source of gears from a company called Pendle Slot Racing based in Lancashire. You will find them on the internet and they cater for the model racing car fraternity.They supply plastic and metal gears of all different shapes and sizes as well as other model related items. Have a look at their online catalogue where I'm sure you will find what you need. Peter.
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8th Jul 2019, 1:20 pm | #10 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
Thanks Peter I’ll check them out
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8th Jul 2019, 2:26 pm | #11 |
Banned
Join Date: Feb 2019
Location: Congleton, Cheshire, UK.
Posts: 609
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Re: Plastic cog needed
Thank you from me also, Peter. I'm after a similar gear to repair the tuning cap on a Grundig music centre! Will give them a look up.
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8th Jul 2019, 2:47 pm | #12 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
Called them, they have nothing availible
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8th Jul 2019, 3:25 pm | #13 |
Heptode
Join Date: Feb 2006
Location: Marlborough, Wiltshire, UK.
Posts: 915
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Re: Plastic cog needed
Closest I have is 7.5mm but only 14 teeth, 4.6mm thick, approx 3mm hole.
Ken |
8th Jul 2019, 3:27 pm | #14 |
Rest in Peace
Join Date: Mar 2011
Location: Basildon, Essex, UK.
Posts: 4,100
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Re: Plastic cog needed
I needed a plastic cog for my KB Discomatic, someone supplied me with a "3D printed" one, it looked a bit rough but it worked just fine. see the damaged one here https://www.vintage-radio.net/forum/...d.php?t=131587 and the replacement can be seen on post #24.
My one on the discomatic had a round hole for the shaft but one with a D shaped hole can be printed. Mike |
8th Jul 2019, 3:38 pm | #15 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
Thanks for the offer Ken
Almost right ,if only it had more teeth I could have reduced the dia but I guess Not having the right number if teeth will be an issue ? |
8th Jul 2019, 4:02 pm | #16 |
Heptode
Join Date: Feb 2006
Location: Marlborough, Wiltshire, UK.
Posts: 915
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Re: Plastic cog needed
Sorry, no idea, guess it all depends on the exact design, slop etc. I do have a 16 teeth one but 8.5mm dia. Nothing quite right ! Everything I have seems the same pitch.
Ken |
8th Jul 2019, 4:07 pm | #17 |
Dekatron
Join Date: Dec 2004
Location: East Yorkshire, UK.
Posts: 3,959
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Re: Plastic cog needed
If you find a cog, is there an underlying fault that caused the tooth to break?
John. |
8th Jul 2019, 7:55 pm | #18 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,637
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Re: Plastic cog needed
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8th Jul 2019, 10:50 pm | #19 |
Octode
Join Date: Jul 2014
Location: Petersfield, Hampshire, UK.
Posts: 1,043
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Re: Plastic cog needed
I think the cog broke because it's mounted on a metal shaft and the nylon has shrunk.
I've seen this before on Walkmans |
8th Jul 2019, 11:14 pm | #20 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,549
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Re: Plastic cog needed
Plastic cogs do not have a very long life if the mechanism leaves any spring tension on them in the "parked" position.
I once fixed a cheap glue gun trigger that had a spring hooked over a plastic peg. I passed a hot nail through the casing from outside and built the inside up with epoxy and for safety covered the cropped end of the nail on the outside with a little bit more epoxy. |