[modeleng] Re: Someone has to do it . . . . .
- From: Harry Wade <hww@xxxxxxxx>
- To: modeleng@xxxxxxxxxxxxx
- Date: Sat, 26 Mar 2005 16:00:24 -0600
At 01:40 PM 3/26/05 -0600, you wrote:
>Ah Ha! Now I see where you are heading Harry. I wonder if the British
lokies >also used a tapered crank pin?
Jesse,
Not so far as I know. They relied upon the expertise of the
"fitters" to press them in at the correct angle.
>could be made tight enough to not slip at some time since they seem to be
>just clamped to the pin.
If you will look at model engines with Walschearts valve gear the
return cranks on many of them are pinned or cottered in some way for just
that reason. But if one does that, then if adjustments are needed a
pre-existing pin or cotter is a hinderance rather than a help. The
assumption is that the return crank is initially left un-pinned and pinned
once correct timing or setting is established, the further assumption being
that no further adjustment will be necessary unless, as Eric has just
mentioned, the crankpins slip.
>since my lokies all have Stephenson gear with four eccentrics,
Stephenson's is my favorite gear (becuz I can undersand how it works),
but not for this particular loco.
>Your gonna have to put a sign on your lokie detailing the crankpin
>design or it will be totally missed by us plebeians! [:>)
No signs. What I'll do, if I'm ever asked "How'd you get those
crankpins pressed in with the flats in exactly the right place?" is say
"Skill, me boy, skill . . . and very careful fitting." :-)
I'm letting you guys (and girls?) keep me from drive wheel turning.
Regards,
Harry
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