[ARC5] lubricating BC-221 or LM freq meter gearing

[Mike Everette]

I have owned one LM that had a visible misalignment of the dial.  It was slightly off center within the round opening in the panel.  You had to look close to see it, but this was the case.  That unit had a roughness in the tuning which never could be gotten out by "conventional means" (lubrication).  Perhaps the dial had taken a whack at some point, maybe when the LM was tossed into the surplus pile by the Navy.  Either something was bent, or maybe the capacitor assembly was mechanically misaligned as a result.  This was back when I was still sure that things like LMs and ARC-5 VFO covers had hydrogen bombs inside and was reluctant to investigate very far.
 
73
 
Mike
WA4DLF

From: Bruce Long <coolbrucelong at yahoo.com>
To: "kgordon2006 at frontier.com" <kgordon2006 at frontier.com>; ARC-5 Maillist <arc5 at mailman.qth.net> 
Sent: Tuesday, January 21, 2014 3:53 PM
Subject: Re: [ARC5] lubricating BC-221 or LM freq meter gearing


May not be very helpful but last year I removed the dryed grease from a National PW gearbox and got it sqeeky clean with solvents.
The gear box moved freely but was slightly rough

Then I added a good grade of synthetic grease, not too much and the feel of the gear box was surprising better.    I'd say add a little grease.   If you don't like it it can be removed





On Tuesday, January 21, 2014 3:38 PM, Kenneth G. Gordon <kgordon2006 at frontier.com> wrote:

On 21 Jan 2014 at 12:14, Dennis Monticelli wrote:

> I have the LM version and while the freq knob turns freely I can feel
> every tooth engage and disengage; it's a bit rough.  As far as I know
> no lubrication was used originally (except for the shaft bearing which
> is not the issue) so the good news is nothing as gummed up.  But I
> wonder if judicious application of the right lubricant would make the
> tuning much smoother.  I did check the action of the anti-backlash and
> it is working correctly.  Has anybody tried applying lubricant to
> smooth the worm gear to anti-backlash gear interface?

I routinely use Tri-Flow bicycle lube for that sort of stuff.

Ken W7EKB

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