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While I have used parametric dimensions in Inventor, I am trying then in Autocad (2025) for the first time. The problem I have is I can't seem to do perpendicular dimension to 2 parallel sloping lines. I managed to get it to work by changing the UCS to align to the slope but when I change a dimension, the dimension no longer aligns to the slope.
For example if I change d5, then d11 and d7 do not measure the true perpendicular distance.
¡Resuelto! Ir a solución.
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It's a bit clumsy but since you need two vertices that are prependicularly aligned between the two parallel lines you can add a couple of construction lines to be referenced by the align dimensional constaint and then freeze the construction line layer.
For example, in th eimage below the red lines have a perpendicular constraint while the magenta lines have a collinear constraint.
The d7 and d11 constraints are to the endpoints f the red lines.
These constraints remain appropriately aligned when HLong is changed.
Freezing the layer hides the construction lines.
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Thanks for the help. I had tried construction lines but did not have enough/right constraints to get this to work.