It's probably about time I posted some more photo's. The only progress has been on the eccentric straps.
These were drawn up in Solidworks as usual, and started life as rough gunmetal castings. There are three eccentrics on this engine two the same for the inlet valves and one a bit thicker for the exhaust valves.
The outsides were cleaned up using a dremel.
Followed by a roughing cut to get a square datum to work from.
Then flipped over to do the other side.
Then the mating surfaces were machined square to the sides.
Spot drilling for the bolt holes.
Followed by the drill.
Bolted together and roughing out the bores. These will be finished to size held flat on the faceplate later so there is no distortion from holding in the chuck jaws.
On the first mandrel for facing to final thickness.
All three were brought to this stage.
Setting them to run true using a roller bearing in the toolpost.
At this point they were bored out to final size, but I was on a roll and forgot to take a photo.
So I then made an expanding mandrel to hold them for boring the stepped recess in either side.
The lubrication bushes were then silver soldered in prior to bead blasting.
A pair of filing buttons were made from silver steel and hardened, these are to finish the radius around the bolts.
And this is how they look today.
You will probably be thinking I have been busy on the engine lately, but the truth is I did what you see here last January and for various reasons have not touched it since.
Phil
