Hello everyone,
I have an issue with Stand-off of 20'' API Buttress Pin (Male) end.
(1) When i measure the stand-off on CNC lathe chuck, i get a small stand-off value than the measured stand-off out side the CNC lathe after release from Chuck. Does it because of Chuck Pressure? and which method should i consider .
(2) Could we control the Ovality of Threaded Pin End ? Because after Threading 20'' API Buttress Pin connection i am not able to get a constant Ovality ( most Ovality of Threaded connection is from 0.030'' to 0.100'' )

It would be very appreciated to get a solution as soon as.