MY CORLISS

ENGINE BUILD

Part 11 by Vince Cutajar

Fitting the valve spindle to the valve disk took me nearly an hour playing around so that it was a nice fit. With the spindle still in the chuck I put the hub on the the valve disk to see how they fit together.

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I left a little clearance between the valve disk and the hub on purpose so that they do not rub together.

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To cut the spindle from the parent material, I put it in the hub, packed it up with washers and bolted it.

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It was hacked sawed off and the hub with the spindle chucked up in the lathe.  Faced it off.

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Left a little clearance so that the spindle can move slightly axially.  Also did the part for the top of the valve disk in bronze.

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Next the inlet and exhaust covers.

After a bit of hacksawing and milling, the covers were brought to size. They are slightly wider (24.5mm) than the plans to accommodate the heads of 3mm bolts. I left them also slightly longer so that after they are finished they could be filed, or milled, so that they will be flush with the cylinder.

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Next their thickness was milled down to 6.35mm.

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The 3mm clearance holes, the central 6mm hole and the two 3mm tapped holes were done.

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Next more work on the inlet and exhaust covers. Decided to use the rotary table to create the boss on the covers. I used the following home built accessory.

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It was inserted in the centre hole of the rotary table and bolted from the bottom of the RT. It has a 6mm shank which is the same as the inlet and exhaust hole of the covers.

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The rotary table was centred using the coaxial centring tool.

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Used a piece of scrap aluminium flat bar at the bottom, then the cover and the rest some packing, before bolting it tight to the table.  Here it is finished.

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And after a little cleanup.

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To finish off the covers, all I had to do was mark off the excess, mill it and draw file it so that I would be flush with the cylinder sides. I also made a couple of gaskets. 


Part ten here. Part 12

 
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