I’m the problem, ha ha
I need a back to basics tutorial, I always seem to miss a certain point and nothing happens . I can see the way both of you do the threads but I’m missing something

Aha I got you mixed up, that was the one I watched

@Dave-R where is it?

ok , after watching Rich's video about 8 times I'm making progress. I was missing the upright extension
what's curve origin? I set it to -1.5 as in the video, so that made the male thread , now to make the female which ill offset by 0.3

with a 150mm diameter

I’m the problem, ha ha
I need a back to basics tutorial, I always seem to miss a certain point and nothing happens . I can see the way both of you do the threads but I’m missing something

with a 150mm diameter

here is the profile and my measurements, there are only 4 crests on the thread

hope this helps

this thread is a weird one . its on an Italian built mega yacht. its a 150mm diameter aluminum tube with a 20mm high thread on the end. the tube holds a retractable electric cable for shore plug in, when at sea the cable is retracted and the cap I have to make screws on the top to keep the water out
I"ll get some more info on the thread

if you look at the pictures I posted you can see the height of the thread

its a screw on cap, the dimensions are correct

unfortunately not that much success, can you do a run through of how you did that

I took a body filler squeeze of the thread as you can see here

hi guys I've been experimenting with the helix tool for making threads with a bit of success, but I'm trying to draw a internal trapezoidal thread ( diagram 150mm, pitch 2.7 mm, depth 1.3mm , 20mm high)
could any one help with a walk through on how to do this

Ok tried my first meter sketch, so just scale down by 0.001 then export and we should be spot on in mm, just making sure I’ve done it right

its the dark blue part wrapped around the blade with the flexible tube coming off it

its for a Bosch mitre saw for dust extraction , about 80mm

I tweaked it a bit more, its not 100% , but I think it could work
bosch dust collector 8.skp

thanks for your time guys, instead of a radius I went with a chamfer, pulled the tube through then scaled the end up. This would be fine, all be it a lot neater , but the profile would work
bosch dust collector 7.dwg

"you" I mean SU, ;o)
ill give the meter to mm a try