Office of Steam Forum for Model & Toy Steam Gas & Hot Air Engines

Stoker, I took the liberty of buying quality spiral flute taps. They seem to require less effort and the chips clear.
Done for today. I need a 3/16-40 model tap and die per the instructions.
I had not seen that in my many overviews of the plans.
I am very happy with today’s results.
9-26-20
I drilled and counter bored the 3/32 holes at 20 degrees as directed. Once again the casting is a bit tricky to set up for machining.
I don’t know what you guys use but I used an 1/8” end mill to cut a flat then used a center drill to guide the drill bit.
It is very satisfying to have good results, as a mistake at this point would be very frustrating.