KJ would you like a little wager that it can't be done to work good if so I'm up for it, I love a challenge and never give up.--Leonard
Leonard,
I've made many taps and know that it can be done, in a crude sense.
What I think you are failing to understand is that we're not talking about a 3/8x16 or a 12x1.5mm.
The thread in question is one of the most precise ever made.
Uni-Loc calls it the 'Radial'. The CNC industry calls it the 'ball-screw'. The medical industry calls it the 'Surgical pin'. It's all the same design. The pitch and diameter may change but the design is the same.
Bill Stroud and Paul Costain have brought a 'version' of this same thread to the cue industry to provide a more precise fit-up for the joint of a cue. It seems to be working rather well. There is nothing crude about it.
You are certainly welcome to tap your Radial pin shafts with whatever homemade tap you choose. You may put some threads in the hole but I seriously doubt that the fit will be anywhere close to what the originators of this pin had intended. If you feel that is good enough for your clients then go for it. I'll stay with the tap that was intended for this pin.
If you feel that your 'fabbed' tap is equally as good, equally precise, then forget the one-time wager with me and fire-up the cut-off wheel.
Apparently there's a void in the supply chain at the moment so there's money to be made.