Time to report on last weekends progress. I started with the crankshaft. I turned 2/3 of the crank profile first.
I was concerned about wall thickness so I decided to drill and tap the part before turning the last part down to dimension.
Then the rest of the profile was cut and the piece parted off
The piece was flipped in the collet chuck and the crank was cleaned up.
Then it went into the collet block and over to the mill to drill for the crank pin.
The pin was pressed in and Locktited into place.
It was then time to start on the cylinder. I pulled out the self centering four jaw that I rarely use and turned the round profile.
Then the bore was drilled and reamed.
The part was moved to the mill to drill the ports and the pivot hole.
The plans recommend countersinking the pivot hole to allow room for the solder. In my previous engines I have followed Elmer's practice of a slight counterbore and I have had problems with the solder fillet being to tall.
I put the cylinder aside to make the pivot pin. I drilled and tapped the pin.
Next I soft soldered the pieces together. I have to say that the countersink worked much better than the the counterbore. I still had to do a little bit of cleanup but nothing like what I have to do for one of Elmer's engine.
That left me with this completed cylinder assembly.
Next it was time to start the piston. After measuring the bore with my hole gauge, I turned up a piston to fit.
Then it was over to the mill to cross drill the hole for the crank pin.
The last piece I made this weekend is the pulley. I turned the outside to dimension and drilled the center hole.
Then I used a threading tool to cut the groove and parted it off.
Here is a current family shot.
All I have left is the flywheel and a base. Until next time.
Tony