I am assuming I am doing something very wrong here..hopefully some machinist type can help me:
I decided to move the flop tube inlet from the rear to a more sensible place at the front of my gas tank. I purchased a pre -made alum' flange/plug from ACS, it has a female 3/4 NPT tapped hole. I got the plug TIG welded in place. When trying to fit the tank in the plane, the protrusion of the plug clashed with a cabane strut, so I cut off 3/8 of material off the plug so the tank now fits. I then purchased a 3/4-14 NPT tap so I could re-thread the plug, since the male fitting was now only tightening a couple of turns due to the taper of the thread. The tap fits well, it rotates about a dozen times then gradually gets tighter, as expected. The problem: as it gets tighter it doesn't seem to be cutting, rather, it seems like all I am doing is wedging the thing in there, like it is bottoming out?
The drill hole size for the tapped hole is.906, which seems to accurate.
I am using a wrench about 12" long to attempt to turn and cut, do I need more torque here? or??
I decided to move the flop tube inlet from the rear to a more sensible place at the front of my gas tank. I purchased a pre -made alum' flange/plug from ACS, it has a female 3/4 NPT tapped hole. I got the plug TIG welded in place. When trying to fit the tank in the plane, the protrusion of the plug clashed with a cabane strut, so I cut off 3/8 of material off the plug so the tank now fits. I then purchased a 3/4-14 NPT tap so I could re-thread the plug, since the male fitting was now only tightening a couple of turns due to the taper of the thread. The tap fits well, it rotates about a dozen times then gradually gets tighter, as expected. The problem: as it gets tighter it doesn't seem to be cutting, rather, it seems like all I am doing is wedging the thing in there, like it is bottoming out?
The drill hole size for the tapped hole is.906, which seems to accurate.
I am using a wrench about 12" long to attempt to turn and cut, do I need more torque here? or??
