Started on the water pick-up casting for my Burrell. Set up in 4jaw, do all internal stuff, get out "Zeus" thread book and check o/d for 3/4 bsp, machine casting to 1.041 in. Go for dinner...return to shop and check book for TPI and set up change wheels to suit. Cut good thread then notice my 3/4 bsp tap for the nut is 14tpi
I have just cut 10tpi on the casting having read for 3/4bsw on the adjacent page
What a good job I have to make the nut as well,,,,,no one will ever notice
You all have a good Easter Terry