Anyone got a list of Elmers abbreviations ?

[Chris machinParticipant @chrismachin]

[Chris machinParticipant @chrismachin]

Hi all , As per thread title has anyone got a list of the abbreviations used on Elmer Verburgs engine plans ? I am having a go at no 24 Beam engine and there are letters such as c,s,b on the drawings , what do they mean

Any help much appreciated

Thanks

Chris.

[JasonBModerator @jasonb]

Its available on line but there are some issues with copyright so I have PM'd you the link.

J

[Jeff DaymanParticipant @jeffdayman43397]

I replied to the "elmer's engines" thread a while ago with the note below:

C – close fit

S – smooth finish

P – press fit (or Pray it fits) – sometimes PF also used

SF – slip fit

LF – loose fit

B – braze or silver solder

F – make flat

SWT – seal watertight

SGT – seal gas tight

W – weld

H- harden

H&G – harden and grind

These conventions were and are used on some North American tooling drawings as guides for skilled toolmakers. Many old timers I worked with would see specified tolerances on tool drawings as an insult to their skills in making and fitting a machine to work as expected, and preferred to see the notations above used rather than tolerances.

http://www.john-tom.com has free PDF files of plans for several of Elmer Verburg's engines.

When I used to work for a large USA based controls company in their tool design office we came up with several unofficial variations on the above symbols over the years, as below:

RF – rust fit -as in when a steel shaft is turned too small, leave it outdoors for a week, then the rust coating will allow it to fit right

PH – not just a press fit, Pound Hell out of it.

LAMW – loctite, after machining it wrong

GIRD – get it right dummy (it's important) as applied to an important dimension

WWD – weld without distortion (ie perform distortion control measures) but this was interpreted as "weld when drunk" a few times.

Have fun with the Tiny. Elmer's engines are great.

JD

[David LittlewoodParticipant @davidlittlewood51847]

Jeff,

ROFL! Your "rust fit" reminds me of the practice, in the early days of railways, of fixing wheel to axles by packing the rather loose joint with iron filings and urinating on it. As you say, after a week it was as tight as needed (one hopes!).

David

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