Kozo K-27 Boiler
This disk of about 2" diameter will be
used to form the firedoor ring. Two slices will then be made in it to
create the two semicircles that will form the top and bottom of the
firedoor opening. I'm waiting on the copper strip that will form the
firedoor ring. September 2, 2023.
Here we see the throat sheet mounted
on a fixture that was bolted to a rotary table to true up the cradle
that the boiler shell will rest in. The sides and bottom have also been
trued up on the mill. The three large holes in the copper will be used
for the 1/4" staybolts. The two smaller holes at far left will be
used to secure the mudring while it is being soldered in place. This
step also required the machining of an #2 MT plug with 1/8" locating
pin so that the wood fixture could be accurately centered on the rotary
table. The throat sheet is now ready for final assembly and soldering.
September 4, 2023.
The firedoor ring was formed out of a
copper strip approximately 3/4" x 6" long bent into a ring of about 2"
diameter. The flats were cut from the bronze ring a couple photos up
and then soldered to the ring. September 9, 2023.
Today was spent making a wooden
backing plate for the front tube sheet and laying out the tube
locations in the two tube sheets. These will be bolted together on a
faceplate so that the tube holes can be bored simultaneously in both
sheets. The tubes will be 3/4" copper pipe with 10 tubes running
through the boiler. September 10, 2023.
My grandfather's old South Bend lathe
didn't come with a slotted faceplate so I had to pick one up on epay.
This one isn't in to bad of shape and was fairly reasonable. September
Boring on the lathe with the faceplate
didn't work out since the swing of the lathe needed to be about an inch
larger. Instead I am using a boring head on the mill. Here we see the
first two tube holes opened up to accept the 3/4" tubes in both the
front tube sheet and the firebox tube sheet.. The third hole has been
drilled about as large as I want to go and will be bored to the final
size. Drilling alone isn't an option since the holes are so close
together and large drill bits might deform the hole next to the one
being drilled. Just seven and a half more to go! September 17, 2023.