Helical gears with splined hubs

  • August 18, 2013
  • Blender 2.6x
  • Render: Blender Internal
  • Creator: seeker47
  • License: CC-0
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Two 24 tooth helical gears of 16 diametral pitch with involute splined hubs. One gear has a 45 degree left hand twist and the other has a 45 degree right hand twist. Tooth profile and OD derived from an STL file by Rush Gears. Shadows turned off.


  • Ohlsen profile picture

    Hi. How did you import IGES in Blender ? The only way I could transfer files from a CAD program, was using STL files. And then there were too many mini triangles to have any good surface.

    Written August 20, 2013
  • seeker47 profile picture

    Opps...I put a reply to your comment in the wrong place. See comment below.

    Written August 20, 2013
  • seeker47 profile picture

    Ohlsen: My apologies. The Rush Gear file was STL. While you can download an entire helical gear STL, I found that the only hub available was with a keyway. I also found that the imported mesh contained many errors so I ended up deleting all of the vertices keeping only one front surface tooth profile. This insured that the involute form and crucial OD were correct. To build the mesh, I spun the tooth, connected the vertices then extruded the profile ten times twisting each extrusion by 4.5 deg. I am a relative noob at Blender having previously used POVray and Alibre and realize that I have much yet to learn about optimum topology. Any constructive criticism is welcome.

    Written August 20, 2013
  • Billhelm profile picture

    Hello, just joined Blend Swap and hoping to learn about gears and eventually build a helical planetary gear system. From what I've seen so far I think I am way out of my depth here.

    Written November 11, 2014
  • seeker47 profile picture

    Billhelm: If you understand geometry then you will have no trouble learning to design gears.

    I recommend that you start learning about gears by tackling spur gears. They are much easier to model and use and there are addons that allow you to create spur gears with little effort. My blend above is of a pair of matched helical gears. Note that for parallel shafts a right hand twist and a left hand twist helical gear is required. For shafts at right angles, use two helical gears of the same twist. If by "planetary gear system" you mean what you would find in an automatic transmission, they are probably spur type gears anyway (I could be wrong about this). Nearly all of the gear manufacturers have technical literature available on their web sites. I recommend visiting the Boston Gear website and downloading their gears design articles.

    Written December 08, 2014