I got more Shop time today. It was grey and rainy all day long, but who cares when we can be creating in our Shops!
I got three more tasks accomplished:
The final 2 sand-trap domes;
The 4 air input pipes;
And the 8 square-drive plugs, two per valve assembly.
The final two sand trap domes were sculpted as previously described. Again, the deburring wheel was key to blending the curves.
Air input pipes (1/8-MPT):
First I mounted the main valve bodies in the mill vice, indexed for easy exchange of the bodies. I marked the bodies where the hole needed to be drilled, to make sure I didn't screw up as I sometime do...
I needed to drill a hole obliquely through the bottom curved surface. I ended up using a 1/8" diameter ball end mill, and it worked perfectly.
No picture so you get to use your internal vision.
The pipe that fits in the valve body is 1/8" diameter brass solid rod (non-operating valves. Remember?)
Pic shows the 1/2" long "pipes" threaded on one end for the union. The other end presses/glues into the valve body. The rod stock I used is also seen.
Lastly, the square drive plugs: 8 each, 3/16 MPT.
First pic is threading the plugs. Then that part was hack-sawed off the rod in the collet.
Then I made a threaded "socket" holder from 1/2" diameter brass rod, and mounted it in a 4-sided collet block to use in the mill to cut the square drive ends.
These parts are quite short so I used needle-nosed pliers to thread them into the holder for milling, and removal after milling.
Pic shows the set up for milling the square drive ends.
A little deburring and they fit right into the MPT threaded valve bodies.
Still to do is solder the little domes on to the valve bodies., and add their 0-90 bolts for looks.
I will need to drill indexing holes to hold the parts in register during soldering. I'm still cogitating how best to do that.
Getting closer.
RussN