ACAD 2002

Hi,

I'm using ACAD 2002 and drawing in solids and then hacking bits off to get
the shapes I want. I have two questions:

1) Why can no-one see my drawings when I send them as Dxf's, is there a
setting I can change to make this happen.

2) How do I draw a square thread, I can't find a thread drawing lisp that
allows this. I want to show a 3/32" square thread of 1" pitch on a diameter
of 1.25" bar.

Regards,

Terry