Driving and driven dimension

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Hi,
I cannot change status between driving an driven dimension. Option for changing
is not available. Could you help me?. Thanks
No puedo cambiar el estado de las dimensiones entre driven y driving. La opción
de cambio no está disponible. ¿Podrían ayudarme?. Gracias
James
5 REPLIES

Re: Driving and driven dimension

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James,
Could you upload your project so we can look at it to see what's happening with
your dimensions? Just a suggestion.
Ed
"Jaime Castillo" wrote:
>
>Hi,
>
>I cannot change status between driving an driven dimension. Option for changing
>is not available. Could you help me?. Thanks
>No puedo cambiar el estado de las dimensiones entre driven y driving. La opción
>de cambio no está disponible. ¿Podrían ayudarme?. Gracias
>
>James


Re: Driving and driven dimension

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James,
Is this all dimensions or only one?
If it is only one dimension, then making the dimension driving would be an
overconstrained condition.
To simplify what this means do the following.
Place a line.
Place a smart dimension on the line. It can be a driving dimension.
Without deleting the existing dimension, place another dimension on the same
line.
This dimension will be driven. It is driven by the first.
Both dimensions cannot be the input to the length of the line.
Regards,
Rick B.

Re: Driving and driven dimension

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I also have a problem with dimensions defaulting to driven - I'm editing a panel drawing I did in January and can't see how to make the dimensions of new cutouts be driving dimensions. There seems to be a default setting I've missed :-(

Andy

Re: Driving and driven dimension

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Andy,
A dimension is a constraint (relationship) the same as a connect constraint.
A connect constraint will hold two lines cogether at their endpoint.
A dimension defines the length of a line for example.
On the Home tab there is a command group called 'Relate'.
In this command group there are two buttons that control constraints.
These are the top two buttons on the right hand side in the Relate command
group.
These buttons are:
Maintain Relationships - This button must be down to enable constraints.
A dimension will be driving when placed with this button down.
Relationship Handles - This turns on and off the display of the
constraintson the geometry.
It does not control the display of dimensions.
One thing to keep in mind is that geometry cannot be overconstrained.
If you draw a line and place a dimension on the line with Maintain
relationships enabled,
the dimension will be a driving dimension.
If you place another dimension on the line exactly like the first, this
dimension will be driven.
Both dimensions cannot drive the geometry. The second dimension is driven by
the first.
So you can get into a situation where you place dimensions that cannot be
driving.
If the dimension was driving, the geometry would be overconstrained.
Regards,
Rick B.

Re: Driving and driven dimension

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Thanks for the quick reply.
The drawing isn't over-constrained, but the Maintain Relationships button fixed the problem.
Either I'd accidentally unset it during the last edit or a default was reset when I upgraded yesterday.
Either way, it's now working fine and thanks again for your reply.
Andy