[GreenKeys] Lubricating a 15 printer

[Richard Knoppow]

    Thank you, this is a good summary. I want to address one 
thing: in this article he mentions that Shell oil warns about 
mixing greases with different thickeners. Some time ago I 
searched out a modern equivalent of a grease recommended by 
Collins Radio for use on the cams and gears of a 51J/R-388 
receiver. One of the substitutes was an Aeroshell grease. In 
reading up on it I found its use was blamed for the crash of an 
airliner because it was mixed with another grease formerly used 
to lubricate the gears in the rudder. I don't remember now the 
exact effect but the recommendation was not to mix synthetic 
grease with natural grease. If one has been used it must be 
thoroughly cleaned out. Its been several years since I researched 
it so I don't have the details.
    The grease I have is a fairly light material, about the color 
and texture of butterscotch. It was not expensive and I have a 
lifetime supply. The Teletype application is certainly more 
critical since the bandswitching in the receiver do not require 
either high speeds or heavy loading.
    The question remains to me what did the original engineers 
want and what currently available material will serve the purpose.

On 7/20/2021 3:04 PM, Nick England wrote:
> A search in the archives on "oil" shows a mere 2512 results found
> I think Doug Jones has done pretty good research
> http://homepage.cs.uiowa.edu/~jones/pdp8/UI-8/ks7470oil.shtml
>
> Cheers,
> Nick
>

-- 
Richard Knoppow
1oldlens1 at ix.netcom.com
WB6KBL