I'm making up a weldment in which the design calls for a continuous 2" of internal threading. About 3/4" of it will be a threaded hole, and the rest will be part of a rod coupler nut. I don't want the threads to bind. What I'm thinking is to drill the 3/4" deep hole as though I were going to tap it, then make up a scrap screw with the end 3/4" turned down to be a slip fit into the tap hole, then use the scrap screw as an alignment tool to hold the coupler nut centrally, clamp it tightly, weld it up, then remove the part to the hand tapper and chase the threads in the coupler nut and use those to guide the tap to cut the threads below.
I would just drill and tap the 3/4" hole and run my scrap screw in and screw on the coupler nut, clamp it and weld it, but I've seen enough pieces move "just a little" when welding to be leery. I don't want these threads to bind.
The threads are 5/8-11 so if they do bind, it could be really difficult to fix.
Ideas?
GWE