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 Post subject: Actual screw size info for flat Japanese volume controls ???
PostPosted: Mar Tue 21, 2017 1:39 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4451
Location: Indianapolis, IN
Does anyone know the actual screw size/threading for the common, flat Japanese volume controls used in the early '60's (if any different than later units) ??? Very tiny screw and probably metric...

The first couple threads are damaged in my Motorola X19 volume control shaft and need this info so I can see if a tap is available...

Any other ideas on how to "fix" these threads without putting excess force on control itself ???

Thanks much !
John


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 Post subject: Re: Actual screw size info for flat Japanese volume controls
PostPosted: Mar Tue 21, 2017 2:14 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4451
Location: Indianapolis, IN
Almost deleted post after finding the screw size in the Motorola factory service manual, but thought that the info might help others...

For the X19 transistor radio volume control knob, a 1-72 x 5/32" screw is specified. Since it's not metric, maybe this isn't the standard size used in other Japanese made controls ???

John


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 Post subject: Re: Actual screw size info for flat Japanese volume controls
PostPosted: Mar Tue 21, 2017 4:01 pm 
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Joined: Aug Wed 26, 2009 1:50 am
Posts: 1094
Location: Mount Pleasant UT 84647 (from Coventry, UK)
xrhonda91 wrote:
Almost deleted post after finding the screw size in the Motorola factory service manual, but thought that the info might help others...

For the X19 transistor radio volume control knob, a 1-72 x 5/32" screw is specified. Since it's not metric, maybe this isn't the standard size used in other Japanese made controls ???

John

I found over the years that some Japanese machine tools use BSP (British Standard Pipe) hydraulic and pneumatic fittings, not metric, so maybe controls on old radios were non-metric also.

Colin


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 Post subject: Re: Actual screw size info for flat Japanese volume controls
PostPosted: Mar Tue 21, 2017 4:43 pm 
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Joined: May Tue 30, 2006 4:46 pm
Posts: 8713
Location: Santa Rosa, CA
My experience is with the Polyvaricon caps that are the same vintage as the early Japanese radios. These are 2mm metric and I bought some screws from China on Ebay.

http://www.mzentertainment.com/technica ... acitor.gif

Rich


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 Post subject: Re: Actual screw size info for flat Japanese volume controls
PostPosted: Mar Wed 22, 2017 12:43 am 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4451
Location: Indianapolis, IN
Thanks Guys...

We didn't have any 1-72 screws at work, so tried a 0-80 and it threaded in fine but is very slightly loose... Am going to see if I can get a 1-72 from one of our vendors...

Am wondering if Motorola had this control specially made for them using "American" hardware since the "regular" screws for the Japanese controls won't fit---and I tried several...

John


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 Post subject: Re: Actual screw size info for flat Japanese volume controls
PostPosted: Mar Wed 22, 2017 10:44 pm 
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Joined: Oct Mon 26, 2009 10:02 pm
Posts: 4451
Location: Indianapolis, IN
What a surprise !

Ace Hardware actually had the 1-72 screws in their stock---20 cents and away we go !

Never thought they'd stock that tiny "oddball stuff"---should have checked there first...

John


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