[Steam-engine] Firebox door (rookie question #999,999)

[Jeff Smith]

Andy,

Mine is like that on the 5hp Huber and there is no
damper on it either.  It is just a smaller scale than
yours.  Just a baffel and a hole in it also.  When I
had a Frick it had one that rotated and could be
closed.  I used to fire a Frick portable on a sawmill
and I used to bank the fire and leave that cracked so
it would still burn the slabs and the fire not go out
from the smoke.  With the ash pan door closed it would
not produce a lot of heat to cause the safety to lift
but the wood fire would still burn and keep the boiler
hot until we started sawing again.  Once I opened the
damper door and started sawing again it would take
right off.

Jeff Smith

   
--- Andy glines <pioneersop96 at yahoo.com> wrote:
> We have talked about keeping the door closed when we
> are running our engines because this lets air come
> over the top of the fire instead of coming up
> throught
> the grates where it will aid combustion.  Closing
> the
> door along with the damper allows you to choke the
> fire down.  Sarturday I visited Francis Lindauer in
> Ferdinand, IN to borrow the door from his 16 HP
> Huber
> to use as a pattern to have a new one made for my
> engine.  I had noticed the hole in the door before
> but
> never thought much of it.  Paul Pavlinovich has a
> good
> pic here: 
>
http://www.steamengine.com.au/events/reports/old_threshers_2001/pics/DSC01098-huber-firebox-door.jpg
>  As you can see there is a baffle behing the hole
> but
> there is a hole in the bottom of it about the same
> size.  What is the purpose of this hole?  Should it
> have some type of damper to close it off?
> 
> Andy Glines
> Evansville, IN
> 
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