Engines > Your Own Design
The Webster Chicago
maury:
I bet y'all thought I abandoned this project. Not so. I've been held up waiting for castings. These sat in a post office (according to the tracking) for almost a month!!! So now I'm back in business. These are the first iron castings, and from the looks of them, I'm pleased.
Now off to the shop.
maury:
Moving along, I decided to machine the governor side flywheel so I could check the fitting of the governor parts.
It turns out there is a protrusion on the flywheel for the governor weights. This prevented me from using any of the chucks I have for this lathe. It just wouldn't fit. I decided to make a set of soft jaws for the purpose.
With the soft jaws, machining the flywheel was mostly strait forward, but being a 9 1/4" flywheel it almost didn't fit on my 12" Clausing lathe. Go figure. After the lathe work I took the flywheel over to the Bridgeport to make the slots for the governor weight arms.
Dave Otto:
The iron castings look to be pretty nice! You must have had some luck finding a good foundry?
Dave
maury:
Dave, thanks for tuning in.
I am pleased with the quality of the castings too, but in an ideal world there would be a little less grinding and the sand would be a little finer. Interestingly, the sand they use for the cores is much finer.
A new batch of castings has just arrived. There is a bit of shrinkage on the Exhaust cage, needs a riser, and there is obviously some pattern work to be done on the water jacket for the excessive flashing.
maury
CI:
Those castings look pretty good.
I have seem some scratch a groove in the sand, to prevent flashing, when using bound sand.
The opposite mold face molds into the groove, making a dike of sorts.
And a bead of mold cement could also be used around the window.
For bound sand, if the molds are not allowed to cure completely on a flat surface after they set, they will actually creep/warp just enough to cause a slight misallignment in the mold halves, and lots of flashing results.
Nice pattern work, and great castings.
So nice to see that.
.
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