[ARC5] Parts needed for ARC-5/274-N - splines...

[hwhall at compuserve.com]

Tom Kneitel's Surplus Conversion Handbook, 1970 edition, had a short note on an ARC-5 RX tuning adapter that seemed the best I've seen. It provides mechanical support for the coupling joint, which seems to be key to getting a good feeling control and one that places minimal strain on the coupling material.

It requires making a short (3/4 inch) cylindrical fitting of brass or aluminum (could probably do it in modern hard plastics or composites, too), drilled & tapped 1/2 - 28 at one end to screw onto the RX tuning ring, with a 1/4 inch hole continuing through the other end. Making that is the hard part. A 1/4 inch dia short shaft extension goes in with enough length to touch the spline shaft when installed, and a piece of plastic tubing makes the coupling from shaft to spline (could use brass or copper, too, I suppose). Then just attach your favorite knob to the 1/4 shaft.


 Wayne
WB4OGM

 

-----Original Message-----
From: Michael <k3mxo.hi at gmail.com>
To: arc5 <arc5 at mailman.qth.net>
Sent: Sun, May 25, 2014 9:00 pm
Subject: Re: [ARC5] Parts needed for ARC-5/274-N - splines...


-----Original Message-----
From: ARC5 [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Kenneth G.
Gordon
> For LOCAL control applications for our favorite receivers, I have found
that 
> 1/4" hard-BRASS tubing makes extremely good spline-connectors.

The current plan here, such as my plans ever are, for this instance is to
use 1/4" brass rod with a short length of brass tubing soldered to it.  The
tubing then goes over the spline and is superglued, soldered, pinned, brazed
or ??? in place to form what is essentially a solid-acting shaft.  The end
result's the same as your method, just the path takes a left turn somewhere
around Cleveland. :-)

Best Regards,
 
Michael, K3MXO, CBLA #6, BL01hx15np24 ... or there abouts  
What was the greatest thing before sliced bread?
http://www.nationalmssociety.org/chapters/NTH/index.aspx
http://wh7hg.blogspot.com/
http://kludges-other-blog.blogspot.com
Hiki Nô! 

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