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Post by daveb1 on Sept 22, 2011 12:00:08 GMT -5
Hi all, on page 98 of the new shay book, photo 8-15 shows what looks to be Heating fins or a reinforcement bars on the top of the fire box sheet. In photos 8-17 page 100 and photo 8-20 page 102 it shows bolts on the inside of the firebox which hold the fins. I would assume they are also soldered. There is nothing in the plans or text that mention these fins. Is this an omission or did Kozo decide he did not need these fins. I am about to assemble the boiler and wanted to clear up this question before its to late.
thanks
Dave
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Post by phutcheson on Sept 23, 2011 3:27:09 GMT -5
Dave,
Although I'm not building the New Shay I do have his book.
After looking at it for a while I would agree that he removed those ribs
from his original Shay.
I'm building A3 Switcher and those ribs (2 of them) are clearly present on top of the fire box at 30 degree off center line.
My guess it that those photos are of the original Shay.
Pat
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Post by toliver66 on Sept 23, 2011 10:29:00 GMT -5
They are silver soldered in place and the screws are to hold the fins in place and in alignment while you silver solder them. After silver soldering the screws serve no other purpose.
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Post by daveb1 on Sept 23, 2011 12:01:05 GMT -5
Hi all, thanks for the info. Pat you got me thinking about the original shay, I also have that book. After looking over the original shay book I think I have figured out whats going on. The original shay firebox sheet was made from 2mm copper and had a single fin which Kozo called a girder stay, which suggests that it was a heat rib but also supplied structural strength to the sheet. The new shay calls for 3mm copper and with this added strength the fin was not needed. The photo is of the new shay, you can tell by the conical section of the boiler. I'll bet that the boiler in the photo was built out of 2mm before the change was made to go with 3mm and by going with the 3mm eliminated the need of reinforcement. I'm going to add these to my firebox sheet because my sheet is only 2.5mm which was the only thickness available when purchased. The 30 degree angle used on your A-3 looks good but must check that it doesn't interfer with the blower pipe.
Again thanks
Dave
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