[ARC5] Dynamotor Maintenance

[Mike Hanz]

On 1/19/2013 4:12 PM, Roy Morgan wrote:
>
> On Jan 19, 2013, at 2:51 PM, Mike Hanz wrote
>> :... WB No. 2 grease for those bearings above 0° F, and GL grease 
>> below 0° F, for both the DM-17 and DM-21.
>
> (Shhh!  He scans the boatanchor horizon from sea to shining sea.
> He carefully approaches a lumpy motionless form on the beach.
> He sees it's a horse, quite dead.
> He boldly Beats it soundly with a big stick, and slowly turns to face 
> the sunrise.)

There is something strangely satisfying with beating a dead horse, as if 
it will rise up and begin working again.  Beating a dead car elicits 
much the same hope, but it takes a 5 pound sledge to do it correctly....

> I likely missed it, but what grease SHOULD we use for dynamotor bearings?

It's in the book, umm, article.

> I have here a nice BC-348 with original dynamotor which I relubed some 
> time ago.  Very little time on it since.  But it's in the barn where 
> the temperature is above 0F whenever I run the thing.

Greases have changed a lot since 1945.  If you run it for fun every so 
often I wouldn't worry about it.  It's more important to clean out the 
brush dust periodically so it doesn't contaminate the grease you *do* 
have in there.  The old greases they specified for those bearings were 
general purpose, not formulated for high speed instrument bearings.

> Though my security advisors strongly urge me to never mention it, 
> there has been a rumor of a SLIGHT possibility that there is here an 
> 800-1 motor generator for the GO-9.  (And thanks to Mike for posting 
> info on these odd screamers.)  However, I can say that there are a  
> number of teletype motors (which normally run at some 1800 rpm).

Hearing an 800-1 should be on your bucket list.  It's very 
satisfying...like beating a dead horse...:-)

73,
Mike