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Gingery cylinder lap

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oltrucks39:
Hello everyone. Faced with having to lap the DOM cylinder for the Perkins engine I'm building, I came across a nice aluminum lap design in Vince Gingery's book Building the Atkinson Cycle Engine. It uses a 7 degree internal mandrel and matching internal bore on the lap. This design could easily be adapted to virtually any bore size. This bore lap works very well.

Mcgyver:
so the set screw goes in the slot as a key.....how do you adjust the OD?  is there a screw or tap tap tap?

I build one of those engines, a very nice project....myself and I'm sure many here would enjoy photos of your progress

oltrucks39:
There is a bolt (not shown) that threads into the small end of the tapered mandrel that sets the diameter, and then the set screw is tightened to maintain it.

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