Author Topic: Dale's k 27 By Kozo  (Read 36855 times)

Offline cnr6400

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Re: Dale's k 27 By Kozo
« Reply #210 on: April 07, 2019, 07:53:51 AM »
Beautiful work. I can believe it was a job getting the door to door fit as good as it looks. Well done!

Offline kvom

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Re: Dale's k 27 By Kozo
« Reply #211 on: April 07, 2019, 12:43:44 PM »
Very impressive parts!  Are the little circles air holes through the doors?

For the most part, fire doors have openings to allow the engineer to see how the fire is doing.  Most air flow is up through the grate.

Offline dalem9

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Re: Dale's k 27 By Kozo
« Reply #212 on: April 07, 2019, 01:11:18 PM »
No the hole do not go through. I am not sure why they are there.

Offline cnr6400

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Re: Dale's k 27 By Kozo
« Reply #213 on: April 07, 2019, 01:46:27 PM »
On the original cast iron fire doors the holes may have been used as part of the core sand. The door would have been hollow, cored with a flat plate shaped sand core, and several round posts and possibly some cast in chaplets on the top of the core would be needed to hold it in place while the iron flowed around it. The round posts would leave the holes after casting. After casting the sand core would be poked out through the holes.  In use, the holes would vent cab air to the hollow in each door to help insulate it a bit by making an air gap between inner and back walls of the door. If the door were solid, the inner face would radiate a LOT of heat into the cab. You would not want to brush up against a red hot fire door while running the engine!

Offline crueby

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Re: Dale's k 27 By Kozo
« Reply #214 on: April 07, 2019, 03:38:35 PM »
On the original cast iron fire doors the holes may have been used as part of the core sand. The door would have been hollow, cored with a flat plate shaped sand core, and several round posts and possibly some cast in chaplets on the top of the core would be needed to hold it in place while the iron flowed around it. The round posts would leave the holes after casting. After casting the sand core would be poked out through the holes.  In use, the holes would vent cab air to the hollow in each door to help insulate it a bit by making an air gap between inner and back walls of the door. If the door were solid, the inner face would radiate a LOT of heat into the cab. You would not want to brush up against a red hot fire door while running the engine!
Clever! Great info.

Offline dalem9

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Re: Dale's k 27 By Kozo
« Reply #215 on: April 07, 2019, 06:23:06 PM »
Thanks That is cool!