Some more work was done on finishing up the fuel tank parts in preparation to weld the whole lot together. The first of the two tapped ports was done with a 1/4 NPT tap. From the pictures below, it is evident that I need to find a better way to tap holes 1/4 NPT and larger. It is definitely not good to crank on the tap while clamped to the mill table. Also clamping to the bench was not happening either. The only way I could get the plate to stay was with some wood buffers in the bench vise. Furthermore, the next port I won't tap to completion because I am not sure how much warping will be happening when this is all welded together. I will probably start the tap and go a decent way down but finish it after the welding is complete.
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