Good afternoon all
I'm having a bit of trouble with my threading Acrylic pen blanks.
Size 14mm cap and barrel thread
So I drill with a 12mm drill first to the full depth required to accept the Nib and external thread of Barrel then I drill with a 13mm drill to the depth required for threaded acrylic barrel plus little extra. I place tap Starter and then intermediate into drill chuck add some oil and then pushing on the back of the tail stock holder (banjo I think it's called) and thread my cap I the turn a concave to the end so it will fit with out any obstructions I then turn my attention to the barrel I turn to 14 mm and add my sliding die holder from Beaufort ink fitted with a 14x1 die (writing facing outwards) I then tighten the center grub screw ( as far as it will go) as this acts as I starter thread, I then thread my 14mm tenon. I then untighten my die and tighten the outer two grub screws until they just hold the die in place and finally turn the die around so the writing is on the inside of holder and finish off the threading.
But the trouble I have or think I have is the cap and barrel feel quite lose until it hit the tenon shoulder.
I forgot to say I chamfer and add oil to help thread, I also remove some thread near the tenon shoulder.
So how can I improve the fit of my Cap and Barrel.