I started a new project on my lathe today. I'm building a enlarged version of the rocking engine.
I faced all of my stock and turned the cylinder to length.
I also started on the cylinder cover, I turned it to the correct diameter. It needs to be marked out for the 6 equispaced holes next.
Today I marked out the holes on the cylinder cover and drilled them.
It was very hard to do on my pillar drill and it took some lining up. I think I moved in a bit to far in while marking the PCD I will have to make the bore of the cylinder smaller by 2mm.
Next, I cut the stock and faced to the required thickness and drilled and tapped M5:
I finish turned the cylinder cover, and adjusted it slightly to Make it easier to drill the holes in the cylinder. The only thing I didn't do was put a recess for a seal as I'm not sure of the size of the one I'll use.
Next I turned the outer diameter of the cylinder, turned the majority first.
And then turned it in the chuck and finished all the way.
Next I drilled the bore to 13mm
And then bolted The cylinder plate and cylinder together ready for drilling and tapping.
I drilled and tapped the holes in the cylinder, I messed up the centre punches on the first try hence the extra set.
I drilled the bore to the final diameter and lapped.
I made a mandrel for clamping the crank wheels while drilling the offset holes.
I drilled the first hole with no problems. But on the second I over tightened the nut and stripped the thread, I had to put the 3 jaw back on and skim the face.
Clocked and drilled.
Then I drilled the holes for the grubsrews to fix onto the crank. And. Threaded M3.