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

[til128 at juno.com]

Wasn't there a warning about Mylar tape here a while back about pins wearing excessively?

Tom WB2TTy

Please note: message attached

From: Eric Moore <mooreericnyc at gmail.com>
To: "Jones, Douglas W" <douglas-w-jones at uiowa.edu>
Cc: Greenkeys <greenkeys at mailman.qth.net>
Subject: Re: [GreenKeys] [External] FANUC PPR Paper Tape Punch - oil vs. grease
Date: Tue, 7 Jul 2020 20:48:33 -0500


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There are 2 manuals relevant to this punch, neither is available online.

Here is the video of this punch in operation and then specifically the
punch mechanism.

https://youtu.be/hGr0F9a7x1A

My paper does not seem to be very oily (it came with the SEL), and I do
have some mylar on the way. The grease I saw around the pins may just be
years of oil and paper dust built up.

Is 1" oiled paper tape available much of anywhere? I see 11/16" for
teletypes available fairly readily.

Thank you for the advice on lubricants, my issue seems to be further into
the drive mechanism and is frustratingly intermittent. Fun fact, the
schematics for this machine are available on ebay for $500.

-Eric


On Tue, Jul 7, 2020, 11:54 Jones, Douglas W <douglas-w-jones at uiowa.edu>
wrote:

> From: Eric Moore [mooreericnyc at gmail.com] -- Tuesday, July 7, 2020 11:33
> AM
> Subject: Re: [External] [GreenKeys] FANUC PPR Paper Tape Punch - oil vs.
> grease
>
> > Do you have any brand/type recomendations for grease?
>
> I've put together a web page on what I've learned about this.
> -- https://www.cs.uiowa.edu/~jones/pdp8/UI-8/ks7470oil.shtml
>
> I've been using Starrett Tool and instrument oil (comes in a relatively
> small convenient bottle).
>
> > 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.
>
> In the case of Teletypes, the punch pins are always lubricated with light
> oil, not grease, and they require the use of oiled paper tape in order to
> prevent loss of lubrication.  In the case of the BRPE punch, there's an
> instruction attached to the cover saying to oil the punch daily.  I've seen
> other brands of punch with a felt wick that serves as an oil reservoir.
> Again, light oil is used..  I know that punches used in the CNC world were
> frequently used to punch mylar tape.  That can't be oiled, so the punch
> almost certainly relies on either some kind of oil reservoir, regular
> oiling, or perhaps grease.
>
> A google search for fanuc manuals shows that there are quite a few out
> there.  I would guess that their product line had some continuity, so the
> wrong manual could well prove useful.
>
>          Doug Jones
>          jones at cs.uiowa.edu
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