[R-390] 390/390a gear train

[Dan Merz]

Craig,  I perused the various manuals that I've downloaded over a couple of
years and found an exploded view of the gears and connections to the cores,
with number of teeth indicated on each gear,  but so far have found nothing
on dimensional layout of the shafts that go through the gears.  Maybe this
kind of info never reached the public,  or has not been found yet.  Perhaps
it exists in an old file cabinet somewhere.   The  manual photos of the
front and rear of the rf deck could be used to extract the layout dimensions
using a reference dimension or two but I don't think all the shafts could be
located this way in the photos I've seen.  The posted assembly of the rf
deck by Scott Seickel with all the steps documented would also be a good way
to put approximate locations on the shafts.  I'm still wondering if anyone
has seen a set of engineering drawings of the gear assembly.  It seems rare
to find original drawings used for the manufacture of any old radios.  I
have a Westinghouse drawing for a 20's RC set,  but I know the only reason
it made it out of the company was because some collector in the 50's wrote
to Westinghouse concerning the set and some staff member was kind of enough
to dig through files and send a copy of an original drawing. Unfortunately,
he did not include the mechanical layout drawings,  which were probably in
the same file.  Dan.

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Craig McCartney
Sent: Wednesday, December 14, 2005 6:34 AM
To: r-390 at mailman.qth.net
Subject: RE: [R-390] 390/390a gear train

 
If I recall correctly there is a detail drawing for each and every gear,
clamp and so forth on the R-390A drawing set CD.  Been a while since I
looked at it though.

Craig

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of Joe Foley
Sent: Tuesday, December 13, 2005 7:07 PM
To: r-390 at mailman.qth.net
Subject: Re: [R-390] 390/390a gear train

Hey, any chance anyone would like to do CAD drawings of the gears and cams?

Joe





--- Dan Merz <djmerz at 3-cities.com> wrote:

>  Hi,  the comments on reproducing the 390a radio raised a question in 
> my mind.  Does anyone have a dimensional drawing of the gear train in 
> either the 390 or 390a?  I'm interested in the dimensional 
> layout/number of teeth of the gears in these radios.  I have seen some 
> of the drawings in the manual,  Y2K and otherwise but I don't recall 
> seeing anything that showed number of teeth, and placement of the 
> gears dimensionally.  I would like to attempt making a 
> computer-displayed simulation of gear movement, cams, and cores,  and 
> the placement of gears would be useful.
> Or even a list of gears,
> size, number of teeth.  I hate to have to take my radios apart to 
> figure all this out.  Any help will be appreciated finding the best 
> available info on this aspect of the two radios,  Dan.

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