[modeleng] Re: Mouland's Valve Gear

Well done Pete. Nope, I've got no magic formula for doing 'em - just go at
it the way you did.



> I had another long session at this last night!
>
> You wouldn't think that setting up a simple system was so complicated!!!
>
> I chose to do the LHS valve gear first.   This was primarily for the
reason
> that the reversing lever was physically attached to the crank axle (vial
> various linkages) and I was certain that there could be no "slipping" or
bent
> linkages.
>
> I set the piston at Top Dead Centre, then set the crank axle to give me
the
> port just about to open.  I then moved it to Bottom Dead Centre and
checked the
> position.  If incorrect I moved the slide valve position.  Back to TDC,
move
> the crank etc. etc.
>
> Eventually I reached a point where the opening seemed similar between TDC
and
> BDC and also between full forward and full reverse.
>
> Now the decision time.  The crank axle was held on the crank pin by a slot
cut
> in the rear and tightened  by a nut and bolt.  This had a tendency to slip
> round (thus creating the problem!)  The settings were unproved, but if I
didn't
> pin the crank axle, the moment I tried it, it would be likely to slip and
I
> would be back to square one!  So, pin and be damned.
>
> I then set up the other side by the same technique.
>
> When satisfied, steam covers replaced and held down temporarily with 4
bolts.
>
> Compressed air applied and she ran as sweet as a nut (in forward and
reverse).
>
> All nuts were tightened, split pins bent and steam cover bolts replaced
and
> tightened down.
>
> So, this was about 2.5 hours of messing around with the two settings (on
each
> side) eventually "spiralling in" to the best match.  I have no drawing for
> Mouland, so it was a rather empirical approach!  Do the members of the
list
> have any alternative methods for doing this, or is this "hit and miss"
approach
> the only option?
>
> Cheers
>
> Peter
>
> --------------------------------------------------------------------


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