Translations:Thread for Screw Tutorial/72/en

From FreeCAD Documentation
  1. In the Part Workbench, click on Part Primitives to create a Part Helix. Give it the appropriate values for Pitch 3 mm, Height 23 mm, and Radius 10 mm.
  2. Move to the PartDesign Workbench, and click on PartDesign Body.
  3. Click on PartDesign New sketch. Select XZ_Plane.
  4. Draw a closed sketch with the required profile for the thread teeth, normally a triangular shape. In this case we will use a height of 2.9 mm, which is slightly smaller than the 3.0 mm pitch used for the helix path. The profile must not create any self intersections when moved along the helix, neither between the turns nor in the middle, thus the sketch as shown for stacking disks cannot be used.
  5. Select the sketch, then click on PartDesign Additive pipe. In Path to sweep along, click on Object, and choose the helix object previously created. Then change Orientation mode to Frenet so that the profile sweeps the path without twisting; then press OK.
  6. When the dialog asks for a reference, choose Create cross-reference.
  7. The helical coil is created, but there is no central body or shaft.
  8. Click on PartDesign Additive cylinder with the appropriate Radius 10 mm and Height 29.9 mm to touch the rest of the helical thread and automatically fuse to it.
  9. Additional boolean operations are needed to shape up the abrupt ends of the coil. For example, you can use additive features to provide a head to the screw, and a tip.