Skip to main content
P
palex11-Visitor
1-Visitor
September 11, 2009
Question

Writing a relation

  • September 11, 2009
  • 1 reply
  • 627 views

I need to keep area constant, but able to change either d1 or d2 dimensions.

Any ideas.

thanks

    1 reply

    B
    brianlynn1-Visitor
    1-Visitor
    September 14, 2009
    You will need 4 parameters dim1, dim2, previousdim1 &
    previousdim2. Make sure when you start that previousdim1 and dim1 are
    equal and that previousdim2 and dim2 are equal. Also you will need to
    replace the dimensions in the drawings with created dimensions that use
    the parameter symbols in place of the dimension. [@o&dim1] in place of
    where you want d1 and [@o&dim2] in place of where you want d2.

    The way I have done this if you change both values dim1 will trump
    dim2, so dim2 will not be maintained to the new value that it was manually
    set to. You will only be able to change one dimension at a time, but this
    will maintain the balance you are looking for.

    area = 400 /* The area you are interested in maintaining. I would put this
    as a note on the drawing.
    If previousdim1 != dim1 /* Checks if the value of dim1 has changed.
    dim2 = area / dim1 /* if the value has changed it modifies dim2 to match
    the current value of area divided by dim1 & sets the previousdim2 value
    equal to dim2 value.
    previousdim2 = dim2
    else
    endif
    If previousdim2 != dim2 /* Checks if the value of dim2 has changed.
    dim1 = area / dim2 /* if the value has changed it modifies dim1 to match
    the current value of area divided by dim2 & sets the previousdim1 value
    equal to dim1 value.
    previousdim1 = dim1
    else
    endif
    d1 = dim1
    d2 = dim2

    Hope that helps,

    Brian S. Lynn
    Technical Coordinator, Product Engineering
    Terms & ConditionsCookie settingsAccessibility statement