I have successful made the male threads many times on the section. I even made an aluminum mandrel with female thread to accept the male threads in the section. When I use AA I snap the threads from the main section when attempting to shape the cone (I guess that is called the nib) from which the RB refill will protrude). I have made a section without snapping the male thread from the section using ebonite. Maybe AA is too brittle for me right now? Here is my process:
I can make the body and cap with acrylic acetate just fine. Shaping the cone of the section without snapping the threads continues to allude me.
- Tool are razor sharp (HSS or new carbide)
- No hole drilled in the section yet, other than a small 60 degree hole to provide stability to the tailstock end when tuning
- RPMs 2400 to 2800
- I have "chucked" the section in collect chuck, the aluminim mandrel and a small spigot like chuck.
- Thread length is a little more than 3/8ths.
I can make the body and cap with acrylic acetate just fine. Shaping the cone of the section without snapping the threads continues to allude me.