Doesn't time fly when your having fun:- time I did a update.
Next bit the eccentric this is exactly the same as for my mill and vertical engine except that it needs to rotate or slip (slip eccentric) around the crank shaft to change the direction of the engine. To do this you need to have a pin to act as a stop on the crank shaft and to section part of the eccentric. As I'm designing this engine for those with limited kit, the easiest way for them to machine these features is to first make a bush with a 3mm hole in it from the same material that the crank shaft is made from, then all you have to do it use this bush to drill the crank shaft for the stop that way it will be perfectly on centre.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02448%20-%20Copy_zpse45nqm1d.jpg)
And to section the crankshaft use this bush to make a little gauge so that you can section the eccentric accurately.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02449%20-%20Copy_zpsp0zwwtgg.jpg)
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02450%20-%20Copy_zpsslqcbdnz.jpg)
Next bit the bracket that will support the valve levers, this is made form 1" box section mild steel.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02451%20-%20Copy_zps2qi97tw6.jpg)
Square the bit up and mill the base nice and flat
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02453%20-%20Copy_zpsnp8qbwls.jpg)
Then drill the hole for to take the pivot bearing.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02454%20-%20Copy%202_zps1n3vk6dl.jpg)
Drill the fixing holes.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02455%20-%20Copy_zpsb3ptqbbq.jpg)
And silver solder the pivot bush in place.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02456%20-%20Copy_zpsxblla6xs.jpg)
Mill away the unwanted bit of the bracket leave the bush intact until the end as this will give added support for the machining.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02458%20-%20Copy_zpsgitlrmkn.jpg)
Thin down the back
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02460%20-%20Copy_zpsgmgvmohd.jpg)
Thin down the front
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02461%20-%20Copy_zpsjsd2uahi.jpg)
When done cut away the part of the bush not wanted,
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02466%20-%20Copy_zpsff2d4mkw.jpg)
and this is where it fits on the valve chest.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02465%20-%20Copy_zpsznrxnddy.jpg)
Levers:- made from some 5/16" square bar, first drill the holes for the two levers.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02468%20-%20Copy_zpsyjbpuq9n.jpg)
Cut them from the bar and make up a mandrel and with them on the mandrel nibble them down to thickness.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02469%20-%20Copy_zpsqpyojdhw.jpg)
Clean them up to shape with a file and this is where they fit.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02473%20-%20Copy_zpste1tni7q.jpg)
Next bit the entablature, the base made from 1/4 mild steel plate cut to size nice and square and mark the centre point out
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02474_zps1luu1gsp.jpg)
Using a wobble bar centre up on a four jaw and drill the and bore the centre hole a nice fit on the cylinder cover.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02475_zpsxkntdf2w.jpg)
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02476_zpsc3c5kwea.jpg)
Use the cylinder covers to spot through to drill 3mm
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02477_zps9yugaug2.jpg)
Drill and tap the side M2
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02479_zpsqytlzxy1.jpg)
Keeping with the circular theme for the side plates, square the plates up and mark one out.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02481_zpsbezejplw.jpg)
Drill a couple of holes in both plates and use these to clamp them together.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02482_zps4helwttu.jpg)
Drill the rest of the holes.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02486_zpspdlpef5c.jpg)
Hacksaw roughly to shape.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02488_zpsh4tlrsog.jpg)
And file to shape.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02489_zpsev3ocfnj.jpg)
And this is how it looks on the cylinder.
![](http://i431.photobucket.com/albums/qq32/sbwhart/Grashopper%20Engine/DSC02492_zps6qjs1hze.jpg)
Cheers
Stew