Constraining toa Sketch Origin

[Anonymous]

How can I constrain sketch geometry to the sketch origin?

The situation is that I want to constrain a circular shaft to be in the centre of a rectangular plate such that it remains in the centre regardless of changes to size of the plate. I reckon I need to constrain the planes of the plate to the planes of the shaft but that requires that the geometry of the plate be constrained to the origin of the sketch used to create it.

David Rennox

[Anonymous]

Several ways to tackle this problem.

You could do as you say and reconstrain the rectangle to the origin. To do
this project the center point onto the sketch and by using construction
geometry and a few dims constraint the middle of the rectangle to the
projected point.

Or you could just make 2 planes on the rectangle itself by selecting 2
parallel surfaces. This will make a workplane that bisects these surfaces
and always remains in the middle regardless of how the rectangle changes
sizes.

--
Sean Dotson, PE
http://www.sdotson.com
Check the Inventor FAQ for most common questions
www.sdotson.com/faq.html
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"drennox" wrote in message
news:f17b82d.-1@WebX.maYIadrTaRb...
> How can I constrain sketch geometry to the sketch origin?
> The situation is that I want to constrain a circular shaft to be in the
centre of a rectangular plate such that it remains in the centre regardless
of changes to size of the plate. I reckon I need to constrain the planes of
the plate to the planes of the shaft but that requires that the geometry of
the plate be constrained to the origin of the sketch used to create it.
>
> David Rennox
>

[Anonymous]

Sean,

The centre plane approach certainly seems best but I would like to understand how one constrains sketch geaometry to the sketch origin. I'm not sure I understand what you mean by 'project the centre point onto the sketch'

David

[Anonymous]

In sketch mode there is a Project geometry button (looks like a plane with a sideways L
under it.) Click on it and then expand your origin folder in the browser window and
click on the centerpoint (or anything else you want to project)

--
Kent
Assistant Moderator
Autodesk Discussion Forum Moderator Program


"drennox" wrote in message news:f17b82d.1@WebX.maYIadrTaRb...
> Sean,
> The centre plane approach certainly seems best but I would like to understand how one
constrains sketch geaometry to the sketch origin. I'm not sure I understand what you mean
by 'project the centre point onto the sketch'
>
> David
>

[Anonymous]

Thanks guys...two solutions to one problem...bargain.