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Someone with your creative skills shouldn't have to hand-tap that many holes. What you need is a modelmaker's power tapping machine.I'm thinking of a stepping motor that drives the existing tapping machine via gears. A programmable chip (e.g. Arduino) drives the motor for a user-selectable number of tap rotations (thus limiting depth of thread). Once those are completed it reverses and backs the tap out and awaits the next hole.Like everyone else, I've run out of superlatives to describe your work, cleverness, speed, persistence, documentation, etc.. Suffice it to say that I'm overwhelmed.
Looking great Chris!
It sure seems like this cylinder is going a lot faster, given how similar it is to the first one.