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Going crazy with onshape moving my objects.

scott_caskey
scott_caskey Member Posts: 55 PRO
in Community Support
When I add a radius and change the dimension of the radius onshape decides I need to move my line over some arbitrary amount instead of shortening both lines the required amount for the radius.   Now another issue when I am adding a line in a sketch, wherever I stop my line and then enter a dimension, it doesn't make it that length from the start point, it makes it that length from the end point!  So it screws up my sketch.  I can't seem to escape whatever mode this thing is in.  Man this stuff is frustrating.  

Answers

  • Tony_C_
    Tony_C_ Member Posts: 281 PRO
    Ground the points you don't want moving.
  • scott_caskey
    scott_caskey Member Posts: 55 PRO
    Why would it suddenly start doing this? Heck, why would it ever do that?  Nobody draws a line starting from a point then enters a value and expects the length to be from the ending point. 
  • billyzelsnack
    billyzelsnack Member Posts: 96 PRO
    Stick with it. It will click for you. Your goal should be to get all of your vertices and lines black. Anything not black is not fully constrained and has freedom to move about. Fortunately you're learning with onshape because its sketch solver is amazing. I find it just so much more well behaved than the other cad packages I have used.
  • michael3424
    michael3424 Member Posts: 781 ✭✭✭✭
    If sketch entities aren't constrained, then when one is changed Onshape attempts to change the others in the proportion that the entities were first drawn in.  For example, draw 2 lines that intersect and make the 1st line approximately twice the length of the second line.  If you then dimension one of the lines to a specific length, the length of the other will approximately double so as to maintain the original proportion.  It actually makes sense once you get used to it but can still be a surprise at times.
  • 3dcad
    3dcad Member, OS Professional, Mentor Posts: 2,482 PRO
    You can work around this mostly useful autoscale by adding approximate dimensions and when finished figure just edit dimensions / make some of them driven to follow the design.

    Autoscale only takes place when adding the first dimension of sketch.

    I too think Onshape has the best sketcher in the industry, after two years of use (and many updates) I don't have any major complaints.
    //rami
  • jayce_fry
    jayce_fry Member Posts: 5 ✭
    edited January 2025

    I have this after i strictly constrain EVERYTHING, and work on something for 5 hours to find out that it has decided to shifted everything.. slightly and randomly for no reason so i have to delete everything and restart.

  • MichaelPascoe
    MichaelPascoe Member Posts: 2,934 PRO
    edited January 2025

    😎

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    rendercad.ai - Photorealistic product rendering.

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  • rick_randall
    rick_randall Member Posts: 430 ✭✭✭

    If you are struggling with sketches, you need to learn about constraints (this is very important - you can't shortcut this). Make sure you fully understand what each one is, and what they do, and how to use them. Take them one at a time, go to help, or the learning center - and research everything that all of them can do. Once you gain this basic knowledge, I bet you won't have anymore problems with sketches.

    Good luck

  • eric_pesty
    eric_pesty Member, pcbaevp Posts: 2,814 PRO

    @jayce_fry

    If this is based on what you posted on the other thread, the issue is that your sketch is way too complex…
    Onshape will eventually stop solving sketches that have too many constraints.

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