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