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Problem with the exercice "Basic features 1" of "Introduction to CAD"

Hello everyone,
I'm learning how to use onshape with "Onshape basis, introduction to CAD". I
And I'm getting mad with the basic features 1! My volume is 1.516 inch3 and it isn't the correct answer… and I don't know why. I spent hours without any change.
You can see my work here:
What's wrong with it?
Can someone help me?


  • cédric_cretegnycédric_cretegny Posts: 3Member
    I have modified my work and now my volume is 1.650 inch3 and it is always wrong…
  • owen_sparksowen_sparks Posts: 619Member, Developers PRO
    Is the correct model given in the answer?  If so can you boolean one from the other to see where the difference is?

    Production Engineer
    HWM-Water Ltd
  • cédric_cretegnycédric_cretegny Posts: 3Member
    The problem, I do not have the correct answer. Is someone know if the corrections of all excercices exist somewhere in the net ?
  • owen_sparksowen_sparks Posts: 619Member, Developers PRO
    @noa Can you help here?

    Cheers, Owen S.
    Production Engineer
    HWM-Water Ltd
  • owen_sparksowen_sparks Posts: 619Member, Developers PRO

    Do you have a link to the question?
    Production Engineer
    HWM-Water Ltd
  • noanoa Posts: 114Onshape Employees, Developers
    edited August 15
    While not published "officially" with detailed walk throughs, we do have the numerical solutions here: https://docs.google.com/a/onshape.com/document/d/12TghwdCibYQFwlLJbyA02jKglQoKzFwaxvahqeOwTvc/edit?usp=drive_web

    In general, if you are able to post a public link to your doc, there may be people who can help you debug.
    Noa Flaherty / Customer Success / Onshape Inc.
  • owen_sparksowen_sparks Posts: 619Member, Developers PRO
    edited August 16

    Here is a place to start:-

    You see I've:-

    (1) Taken your part and derived in the answer's part as an overlay. 
    (2) Copied both parts via a transform.
    (3) Boolean subtracted the results to show the exact differences.


    Sorry, I've not read through the exercise to see what the problem is.

    Hope that helps, Owen S.

    Production Engineer
    HWM-Water Ltd
  • brian_jordanbrian_jordan Posts: 55Member, Developers PRO
    There is probably a better place to ask this but for the moment here will suffice.
    When I select the link that @owen_sparks has just posted, rather than opening a document that relates to this topic my browser takes me to my own recently opened documents with a message at the top saying "Failed to load document for workspace. Resource does not exist, or you do not have permission to access it." This is the second time this has happened in 2 different threads over the past few days.
    I am using an up-to date Chrome 64bit browser on 64bit Windows 10 and I have flushed the cache to see if this clears the problem and it doesn't!
    Anyone else?
  • owen_sparksowen_sparks Posts: 619Member, Developers PRO
    Sorry @brian_jordan in this instance that was my mistake.   :(

    The document exists but I'd failed to make it public.  So when I clicked the link to test it it worked fine, but when you clicked it it wasn't available so is defaulted you back to your recent docs.

    Sorry for wasting your time, and please retry if you're still interested.

    Owen S.
    Production Engineer
    HWM-Water Ltd
  • brian_jordanbrian_jordan Posts: 55Member, Developers PRO
    Thanks @owen_sparks You didn't waste my time and I am now able to look at the document. In fact this has been educational because you have confirmed that what I thought was a problem is in fact the default behaviour - something I had missed.
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