followed a video, helix touches edge of 7.9mm dia cylinder,
orient perp to curve the profile of the thread (I have a 1 x 1.5 triangle, helix is 1.5 apart (pitch).
sweep1 then cap.
then to overlap thread to cylinder, make cylinder the correct diameter 8mm
scale2D cylinder from centre to become 8mm dia.
run boolean union…fail !
boolean fail on overlapping screw thread following video.3dm (539.8 KB)