[PSUBS-MAILIST] lapping process

[hank pronk via Personal_Submersibles]

Hi all,I am building a rig to rotate my hatch on Elementary 3000 to lap the seat to perfection.  I am doing this because I am in need of low cost projects and I want to see if it works for future deeper diving subs.  I have little experience with lapping other than lapping valves in antique engines.  Can I just let the hatch float on the compound  while it is rotating with the full weight of the hatch bearing down on the seat, or do I need to suspend the hatch while it rotates to control the weight of the hatch on the seat.  I will be re-maching the centre hole of the hatch because the centre hole is no longer dead centre from repeated machining processes.   The centre hole will hold a shaft with bearings to keep it rotating true.Any advice will be helpful.Hank
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