I am trying to cut 0.5mm pitch 60 degree internal threads on a thin-wall 6061 T6 aluminium tube ( 40mm outer and 38mm inner diameter ) . This is the first time I did it and multiple problems were encountered :
1) The tube is not perfectly round. The dial reading swings between 0 - 0.04 mm when measuring the outer surface , 0 - 0.12 mm for the inner surface
2) The tube wall is not uniformly thick as indicated by the dial readings above
3) The tube wall flexes upon cutting.
Because of these issues, the thread produced is really messy. The tube was supported by a fixed steady in the process. Can anyone lend me some help pls ? Thanks in advance.
1) The tube is not perfectly round. The dial reading swings between 0 - 0.04 mm when measuring the outer surface , 0 - 0.12 mm for the inner surface
2) The tube wall is not uniformly thick as indicated by the dial readings above
3) The tube wall flexes upon cutting.
Because of these issues, the thread produced is really messy. The tube was supported by a fixed steady in the process. Can anyone lend me some help pls ? Thanks in advance.