to make threads on a VMC I have used the SPIRAL milling function of Fanuc on a OMA control. This required each thread whirl full circle to have its own line of program, ie a G02 or G03 plus the Zdepth increment =pitch of thread ( for a vertical down spiral )
I was in effect "tapping" into drilled holes in a very hard bronze type material using a single point fly cutter made from solid carbide, small enough in diameter for the tip not to hit the other side. I called it thread whirling. Tools are now available with full thread form of various pitches. These were internal threaded holes.
To mill three external studs as your picture shows you would need to hold the work upwards & mill around to create the male shape using mills & angled form cutters for the tube flares to seat onto. Then thread whirl around the outside male round to cut very accurate threads. (or use a die nut in a floating holder and the tapping cycle).
You would then have to index the part to the next leg of the Y and repeat all above.
The engraving can be done using EzCam & tablet but I have never been able to import data so it takes a lot of work. I made my own set of letter & number fonts and move & enlarge rotate to suit, very laborius! I have an old version of 2D EzCam on 8" floppies! runs on 1983 NEC HO3 PC that I still use and love it!
Of course a lathe would be much simpler! with index fixture on a face plate?  |