Here is the next update. The next parts to be worked were the cylinder covers. I started by milling some brass 3/4 square bar to 5/8 x 3/4. The bar was set up in the four jaw and the locating boss turned for the front cover.
Then it was parted off cleaned up and put aside. Next I turned the piston rod boss on the other cover.
After it was parted off, it was placed in the collet chuck. Then the back face was cleaned up and the locating boss was turned.
Following that, the hole for the piston rod was drilled and reamed.
Both covers were taken to the mill and the mounting holes were drilled.
Next up was the piston. I am planning to use an o ring so I turned the piston 4 thousand undersized.
I am using 00X series rings so they are 1/16 in diameter. That is the same size as my grooving tool so it made it easy to cut the ring groove.
Then the end of the piston was drilled, tapped and parted off.
Next I turned and threaded the piston rod from some brass stock.
The piston was mounted on the piston rod and the end was cleaned up.
Next up was the connecting rod. The blank was squared up and the part laid out. The holes were then drilled and reamed.
The profile was then cut by milling to the lines.
After rounding over the ends, I turned up the required bushings.
Next up is the piston valve. The part was built up by bonding the valve spools onto a 3/32 brass rod.
Then the end was threaded to fit the crosshead.
Next the flats were milled into the valve assembly.
To finish the part, I cut a screwdriver slot in the end.
The last thing I did was to make some studs and test mount the cylinder and valve block.
Till next time
Tony
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