Creating relations between dimensions

Comments

• jelte_steur_info Member Posts: 587 PRO

  March 2024

  Hi gustavo,
  this can be done using variables:
   Create a variable named 'd1' (it'll appear in the feature tree)
   In a feature or sketch, you can type a formula. type "#" and you'll see a list of parameters you've created (you can even create one there and then).
  
  when you type in a sketch for a dimension "#d1 + 3" it won't work because it can't add numbers to millimeters or inches.
  so type "#d1 + 3 mm" and it'll work.
  
  you can also go ahead and create a new variable. name it "d2" and the value can be calculated.
  
  good luck

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• robert_scott_jr_ Member Posts: 681 ✭✭✭

  March 2024

  Hello Gustavo. Create a variable named d1 and assign a value to it. If the value is 2 and you are working in inches It will look like this: #d1= 2in   . Now you can use d1 in the equation for d2 but you must add a unit type to the 3. When you are beginning to enter d2's dimension, hit the pound(#) key. This will call up a list of created variables and you can select d1 and go on from there. d2's dimension should look like: #d1+3in - Scotty

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• Ashley_Dowle Member Posts: 2 ✭

  November 23

  Any idea if this is going to be addressed? It seems a bit crazy to me that I have to create a variable external to the sketch. Often I will just want to make another dimension half of the referenced one (for example). I would not want the referenced dimension to have a representative variable cluttering up the variables table, which I would generally reserve for significant parameters. I've not used a CAD program that does not allow other dimensions to be referenced within the sketch.

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• S1mon Member Posts: 3,746 PRO

  November 23

  For something as simple as one dimension being half another, I just use construction lines as necessary and set them to be equal.

  

  Simon Gatrall | Product Development Specialist | Open For Work

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• martin_kopplow Member Posts: 1,065 PRO

  November 23

  https://forum.onshape.com/discussion/comment/123620#Comment_123620

  Yes, or just make a center point line.

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