Drawing bolts/threads in Rhino

[Max]

Hi all,

I'm pretty new to Rhino and I'm wondering if anyone knows an easy way to draw a threaded rod or bolt. Also any help on inside threads would be appreciated.

I've seen the tutorial for doing these on "CadDigest" by Robert Schultz, but I can't seem to follow it....http://www.cadtutor.net/forum/images/icons/icon9.gif


Thanks.

Max

[TedKyte]

Hi Max....
I just create a helix around the rod and then create a triangle profile and sweep 1 and then cap it and subtract it from the rod.
That would be for a bolt type application.
http://www.ted-kyte.com/3D/Pictures/Carriage%20Bolt.jpg
Sometimes you have to put the triangle on the other end too. But usually just fiddling with the "Road Like" will get what you want.

[Max]

Thanks Ted,

Thanks for your help (and very nice bolts), but I'm still having issues with this. I've made the shaft, put a helix on the diameter, created a thread profile (a triangle in this case) located at the end of the helix (with the top of the triangle on the diameter), sweep1 and cap the ends. Now is where I get stuck. When I try to "difference" the shaft from the thread, the whole shaft disappears....

I'm sure it's something really simple that I'm missing, but I can't seem to get it. Do you see the error in my procedure?

Max

[TedKyte]

Hi Max...
Sounds like you have to flip the normals on one or the other.
use the "Dir" command and make sure they are all pointing in the outward direction.

[TedKyte]

It also works for inside threads and tapered...

http://www.ted-kyte.com/3D/Pictures/Die%20Dormer%2058.jpg


http://www.ted-kyte.com/3D/Pictures/Tap%20Dormer%2078.jpg

[TedKyte]

The trick for tapered is to draw your tapered cone and then the helix on the outside and use "Pull" or "Project" to get the helix on the tapered cone.

[Max]

The arrows are all pointing out, but still no go.... It seems the only way I can make this work is to use a shaft that is the root diameter of the thread, and make another shaft that is the O.D. of the thread and join the two....

Not sure what I'm doing wrong, but I can move forward.

I went to your site, and saw some more of your work. Very nice!!

I'll keep fumbling on this thread thing, and maybe a light will come on for me...

Thanks for your help.

Max

[TedKyte]

If you like you can send me the file and I will have a quick look for you.
ted-cathyATted-kyte.com
Replace the AT with the @ symbol.

[TedKyte]

I sent your file back with a few little tweaks...

[bunep]

hi,

i get same problem.

i wish that theres some software that can make automatically for threadings.

ex: 3/8X11 and wuzz...its done..so we can edit.

or if there sample file for that kind of threads... or sample picture for all the completed thread size.

thats just what i wished. LOL
or maybe they're already make that kind of stuff??:o

kindly regards
me..