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Start a new sketch on a curved plane / shaft [with animated GIF]

daniel_chowdaniel_chow Member Posts: 108 ✭✭
edited November 2015 in Community Support
Quick question, I'm trying to put a bolt hole through the top of the cyan colored cylindrical shaft. It won't let me start a new sketch to draw a hole. But I am able to start a new sketch on a flat surface. What am I doing wrong here? 

Also what is the best method to draw a hole through the curved surface of the shaft? What about a blind hole? A slotted keyway? 

Here is a link to the public document. 

Best Answers


  • viruviru Member, Developers Posts: 619 ✭✭✭✭
    @daniel_chow , User can create sketch on planer face only therefore you have to make plane normal to cyan colored cylindrical shaft. After that you can create sketch and perform hole operation as shown in below video.

  • daniel_chowdaniel_chow Member Posts: 108 ✭✭
    Thank you guys! 

    For anyone else searching about the hole feature in onShape, here is a video: 

  • andrew_troupandrew_troup Member, Mentor Posts: 1,584 ✭✭✭✭
    edited November 2015
    Thanks for that link, @daniel_chow

    One further thought: it makes sense to require a flat plane to define a hole through a cylindrical body.

    Without such a plane, Onshape would not know to what direction vector the hole axis should lie parallel.

    Given a plane, the normal to that plane defines the direction.


    A truly brilliant thing about Onshape's Hole feature (and not by any stretch the only brilliant thing) is that unlike the situtation in most legacy MCAD apps, a single hole feature is not tied to a single plane.

    Instead, it refers directly to sketch points, which can be on as many different planes as the user needs hole directions.


    Actually another of those brilliant things is relevant to this discussion about planes: unlike legacy MCAD, the plane in Onshape is NOT necessarily used as the datum for hole depth, when a better option exists
    (refer Daniel's linked video, from 0m44s)
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