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Making screw caps and nuts - Printable Version

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Making screw caps and nuts - ivla - 10-04-2023

Making a simple screw cap with "thread" primitive.

Make the helicoid thread object:
[Image: 001-cr.png]
Extrude upper non-flat face by Y axis, not by normal (!!!) :
[Image: 002-cr.png]
Repeat with lower face:
[Image: 003-cr.png]
Flatten those faces by Y:
[Image: 004-cr.png]
[Image: 005-cr.png]
Inset both faces:
[Image: 006-cr.png]
[Image: 007-cr.png]
Scale (enlarge) both of them radial by Y axis
[Image: 008-cr.png]
Use "Absolute scale" to set size of upper face:
[Image: 009-cr.png]
And repeat with the lower (with same size by X & Z):
[Image: 010-cr.png]
Select upper and lower faces and use "bridge"
[Image: 011-cr.png]
Select whole oblect and "Invert" it:
[Image: 012-cr.png]
Select faces on lower end of object and extrude it by Y axis
[Image: 013-cr.png]
Unlesect all, select faces in the inner surface:
[Image: 014-cr.png]
"Dissolve" it
[Image: 015-cr.png]
All done.
Below I cutted the cap in half to show what's inside it:
[Image: 016-cr.png]

Same process can be used for making nuts, but it requires to modify the initial oblect (dissolve some faces in its lower - smaller - end) and does not require last steps (extrude & dissolve).

Modifying thread primitive for making nut:
[Image: 101-cr.png]
Select lower - smaller - face, then "Select more" (by presing "+" key):
[Image: 102-cr.png]
"Dissolve" it:
[Image: 103-cr.png]
Select those two points and "Connect" it:
[Image: 104-cr.png]
"Connect" another two points:
[Image: 105-cr.png]
Primitive is ready.
To make nut extrude upper and lower faces etc., as shown above.

RE: Making screw caps and nuts - Xavier - 10-30-2023

Thanks Ivia, it was helpfull!.

[Image: BoltsAndScrews.JPG]

Wings 3D file: (Right click on the link & "save the link as...")
  BoltsAndScrews.wings
M3/ M4/ M5/ M6/ M8/ M10/ M12

RE: Making screw caps and nuts - ivla - 10-31-2023

(10-30-2023, 07:58 PM)Xavier Wrote: M3/ M4/ M5/ M6/ M8/ M10/ M12

About "standard" metric screw thread.

There is plug-in for scripting in Wings3d by edb:
http://www.wings3d.com/forum/showthread.php?tid=3096
In the last page I placed a script for generating the profiled thread (metric ISO/DIN13 and some simple profiles).

Take a look.

RE: Making screw caps and nuts - ivla - 11-01-2023

...and about using "booleans" for making nuts: it may crash if there is too many faces, some thousands or even more - like blue ring here:

[Image: f01.png]