[GreenKeys] [External] FANUC PPR Paper Tape Punch - oil vs. grease

[Eric Moore]

Thank you Doug, I plan to make a video of runnning and opening the machine
later today for youtube.

Do you have any brand/type recomendations for grease? I imagine the punch
pins (pawls?) Will lose oil pretty quickly moving minutely but vigorously
and rapidly through the vertical shafts of the punch head.

-Eric



On Tue, Jul 7, 2020, 11:21 Jones, Douglas W <douglas-w-jones at uiowa.edu>
wrote:

> From: Eric Moore [mooreericnyc at gmail.com] -- Tuesday, July 7, 2020 10:45
> AM
>
> > Hello, you may remember I was seeking a paper tape punch recently.
> >
> https://www.dnc-electronics.co.uk/wp-content/uploads/2017/03/a13b-0117-b001.jpg
>
> A nice clean looking brick of a machine!
>
> > I see that it has grease on the metal joints, but it seems like light
> machine oil like starrett oil is recommended for machines like this.
>
> It's new enough that I think you can assume that the grease is factory
> original and not accumulated from preventative maintenance in years since.
>
> If you have photos to show you which joints were greased, re-grease those
> joints.  Use fine oil on everything else that looks like lubrication would
> help.  As a general rule, any lubricant is better than none on joints where
> there is any sliding contact.  The wrong lubricant will do less damage than
> none.
>
> Grease where light oil is recommended may slow things down, springs that
> would normally return things to idle positions may not operate quickly
> enough, causing, for example, mispunches caused by pawls not being pulled
> back quickly enough.  Extended running like this can do damage because a
> partially engaged pawl means that the pressure on the engaged portion of
> the pawl is higher and may lead to breakage (if only a narrow edge of the
> pawl engages, that edge can end up chipping off).
>
> My manuals for Teletypes and Flexowriters have detailed lubrication
> instructions.  Typically, there's set of lubricants -- light oil, a grease,
> and an oil-grease mixture, for example, and then diagrams showing for each
> contact point in the system, which lubricant to apply to each point.
>
> Lacking such manuals, there are some simple guidelines:  You want grease
> on high-pressure bearings where light oil would not provide a thick enough
> film to prevent wear.  You want light oil on sintered bronze bearings where
> capillary action keeps the bearing lubricated.  You want grease where
> motion will fling the oil out of the way, you want light oil where viscous
> grease will slow the return action of light springs.
>
>            Doug Jones
>            jones at cs.uiowa.edu
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