[R-1051] OFF FREQ

[bonddaleena at aol.com]

Hi Mike. Back "in the day" when I was a Customer Engineer with IBM, we used a chain EXACTLY like the el-cheapo plastic chain you describe. It was even the same pitch! It was used to drive the collator of the infamous Series III Copier.
Man, if I had a dollar for every one of those POS chains I replaced, I could have retired years ago. One of the problems with the IBM chain (other than they broke every week), was it's complex path over and under a dozen or so gears (that you couldn't even see).
Some Engineer (??) out at the plant in Boulder, Co. thought that coating the chain with Moly (yep, the gray crap you can never get off your skin), would make them last longer. WRONG-O!!
All it did is give us unfortunate souls who worked on those god-awful copiers, permanent, black hands.
A couple of years into this fiasco, one chap won a $100,000 Suggestion Award for suggesting a switch to the metal chain.
I only wish I would have ordered several (!!!) of those loooong chains as spares.

Oh, why was the chain plastic to start? 
Acoustics. The copier couldn't pass with the metal chains!

ron
N4UE







-----Original Message-----
From: mikea <mikea at mikea.ath.cx>
To: R-1051 Discussion Group <r-1051 at mailman.qth.net>
Sent: Tue, Apr 19, 2011 2:35 pm
Subject: Re: [R-1051] OFF FREQ


On Tue, Apr 19, 2011 at 06:26:56PM +0000, tgrieco at optonline.net wrote:
 Not mushy at all. It just snaps as you turn the knob. Each snap brings me
 further off freq. Right now I have no idea where I am. Can this rig be
 zero beat?
This is a "G" model, right? I'll bet you a Coca-Cola that you've got a
ailure in the (WEAK PLASTIC) "chain" between the knob and the rest of
he rig. 
Take a look at <http://mikea.ath.cx/R-1051/R-1051H-under-2.jpg>, which
s an image of the underside of my "H" model, and compare it with
http://mikea.ath.cx/R-1051/R-1051B-under-1.jpg>, the underside of my
B" model. Note that the "B" model uses a nice metal roller chain,
hile the "H" (and the "G", I think) use less durable plastic-and-nylon
lastic belts with crosslinks at the same pitch. Read the text at
http://mikea.ath.cx/R-1051/> and weep gently. Chains are available from
tock Drive Components. I'm working on putting one in my "H" model to
eplace the middle KC drive belt myself. Plan on spending some cash for new
hains, or maybe someone has a parts unit.
-- 
ike Andrews, W5EGO
ikea at mikea.ath.cx
ired old sysadmin 
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