Further progress in the shop.

June 7, 2010 at 12:26 pm | Posted in Uncategorized | 1 Comment
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The Stuart No. 1 is progressing nicely. I finished drilling the upper cylinder head yesterday. A photo:

Photo on 2010-06-07 at 12.04.jpg

The spigot in the center needs to be taken off. I loctited the head to the cylinder, and mounted the rig in the mill on a rotary table. I drilled both with the tap drill for 2BA. After drilling, I knocked them apart with a hammer and opened the holes in the head out to clearance size. I was then able to clamp them together(using a large kant-twist clamp) and use the head as a tapping guide. Got the studs in perfectly straight. It’s a touch snug, but goes on wonderfully.

With the head off the cylinder:

Photo on 2010-06-07 at 12.11.jpg

The head and top of the cylinder where lapped together using clover compound. I applied a few dabs between the two and used the mill to spin the head while I held the cylinder against it. The meeting face has a nice dull sheen.

In this picture you can see the port face:

Photo on 2010-06-07 at 12.11 #2.jpg

This engine employs a garden variety d-valve. The steam passages are cast in. I still need to lap the port face to flatten it. I think I will do this before drilling for the steamchest bolts. It’s a pain and a half to get the lapping compound out of the holes.

Photo on 2010-06-07 at 12.11 #3.jpg

This shows the lower end of the cylinder. Undrilled for the lower cylinder head. That has to be tackled next, and it’ll be difficult. I removed the chucking spigot prematurely. I’m going to machine out the gland and use it to mount the part to an arbour. Pictures will be forthcoming on that one too.

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1 Comment »

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  1. Looking good :-)


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