BUILDING THE SIMPLEX PETROL ENGINE

Part 7 by Phil Procter

Once the cam radius fixture was made I could finish the cams by using it on the rotary table.

First the table is clocked true to the spindle.


Here is one of the base circle radii just being milled.


Next job was the cam shaft itself, this is simply a piece of 1/4" diameter bar with some holes for the cam locating pins to be pressed in.

So it was a simple indexing and drilling job once set up on the mill.


Here is the shaft during a trial assembly with the skew gear and cams.


And here we are setting the cam timing so the skew gear can be finally pinned in position on the shaft.


Here is the ‘last but one’ part to be made, the carburettor retaining clamp.

Loctite an aluminium blank onto a short stub of round bar, this acts a chucking post for milling the radius etc.


Cut the bulk of the corners with a hacksaw.


Stick it in the Marlco collet indexer and mill the radius.


A bit more slitting, drilling and tapping and we have a split clamp.

 
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