[modeleng] Re: Ashpans Rob Roy and Maisie

Hi Rich,

Model engineering drawings are notoriously vague on ashpans (and a few other 
items as well!).

If I understand your Rob Roy arrangement correctly the hole is smaller than 
the grate so the first thing to do is to open up that hole to match the 
grate. The next thing to do is to create some holes in the sides and/or the 
front and back to allow air to enter the ashpan. If you can do it then 
create holes of sufficient area to match the open area of the grate.

It is not clear from your description how the ashpan is emptied. By far the 
best arrangement is to hold the pan in place with a single pin through the 
frames the removal of which allows the pan to fall down onto the ground. If 
the grate rests on the ashpan then this will also fall out.

If you cannot achieve this arrangement then you will need to produce some 
sort of ashpan door to allow the pan to be emptied and the grate should be 
made in longitudinal sections such that they can be hooked out through the 
firehole door.

Hope this makes sense,


Barrie


----- Original Message ----- 
From: "R.L. Roebuck" <rlr20@xxxxxxxxxxxxxxxx>
To: <modeleng@xxxxxxxxxxxxx>
Sent: Friday, March 31, 2006 12:46 PM
Subject: [modeleng] Ashpans Rob Roy and Maisie


> Hi there All,
>
> Am doing a spot of work on a Rob Roy at the moment, and I have a question
> about the ashpan.
>
> On Maisie, there is a metal shield that the ash will drop on, hopefully
> cool a bit and then fall ont he track, deflected so that it doesn't get
> onto the axle.
>
> On this Rob Roy though, which seems to be built to the plans, there is an
> ashpan which is totall enclosed, save for a small rectangular hole at the
> top.
>
> Surely on Rob Roy, this grate will clinker up and then have to be removed
> to be emptied, and the fire started again; whereas Maisie will be able to
> keep on steaming - or am I missing something.
>
> On the other side, the air will probably get into the firegrate easier on
> Maisie, but will be cooler, whereas on Rob Roy maybe the air won't flow as
> freely, but will get a bit more warmth on it's torturous route in.
>
> ...OR...
>
> have I misread the plans, or made some other similar mistake?
>
> Any thoughts gratefully received.
>
>
> Yours,
>
>
> Rich.
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