Resizing Sketches from a center point

[Anonymous]

I am using Fusion 360 to draw table tops for a project I am working on. The table top I am currently working on has 1" radius corners on it. I have several 1" radius table tops to draw in various sizes. In the example image below I have drawn a 38"x48" top with the corners rounded centered on the middle axis point. I would like to then be able to change the dimensions of the top and have the sketch stay centered on the middle point. But currently, when I change the width the sketch scales out to the right like in the second image. Is there a way to keep the sketch centered and scale out from the middle?

[davebYYPCU]

You just need more constraints.

using a Centre point rectangle, fillet the corners, then add coincident constraints, between the rectangle sides and the end points of the diagonal lines, (8 constraints to add)

Dimension to either the rectangle sides or the diagonal points will then work.

Might help...

[SaeedHamza]

Hi,

Try the mid point constrain

Regards

[davebYYPCU]

Sorry, but the midpoint constraint creates unexpected results,

(snaps the first side being used to the origin)

Adding a point to the midpoint of the rectangle lines,

and then horizontal / vertical works with the point on the line.

Might help...

[SaeedHamza]

Thanks for the tip @davebYYPCU

[etfrench]

@jeff_strater:  This looks like a bug.  When a center based rectangle has radiused corners, the original center constraints are not honored.  Also, if you add a midpoint constraint to one of the rectangle's diagonal construction lines, the midpoint constraint is not honored when changing the length of a side.

[jeff_strater · Accepted solution]

Yes, this is a bug, you are correct.  The bug is FUS-29173

Thanks for reporting it.

[etfrench]

The best workaround would be to apply the fillets to the corners after extruding the 3d model.  If you use a User parameter, it will be easy to change the radius for different sizes.  You can also use a formula in the parameter to make the radius relative to the length of a side.

[Anonymous]

Resizing the dimensions of a CENTER POINT rectangle in sketch mode (with or w/o filleted corners) doesn't cause the resize to adjust around the center point! Amazing. Who would write software like that? That can't be dismissed as simply a "bug." It represents a thought process that is alien to me, and I suspect to most people. I ask F360 team members to explain the thought process here, b/c it might lead to wider insights into the general F360 funhouse of mirrors. I suspect it represents some sort of deep seated hostility toward changing sketch lines once they have been initially laid down. Is that the explation? I hope not, because that would also mean hostility to the process of design itself. What say you, F360?

[etfrench]

It seems to be working fine three years after the bug was reported.  Create a screencast and attach your file, if you can repro the problem.