2D Constrains

[ankurpraja]

How to constrain a 2D sketch with the original axes in inventor 9?

eg. How will i draw a circle with its center exactly on the origin?
or how to draw a rectangle with its 2 sides on x-axis & y-axis respectively?

Is it possible?

[Mr T]

Start the sketch and you should 'feel' the mouse snapping to the origin for your centre of the circle. Going +ve X and Y should snap on to the axiz as well.

Nick

[JD Mather]

Start the sketch and you should 'feel' the mouse snapping to the origin for your centre of the circle.

Nope, that is wrong. The "feel" is a soft snap, you need a hard snap which results in a Coincident constraint.

Expand the Origin folder in the browser and right click on the Center Point and turn on Visibility. (or you could do this with the origin Workplanes) While in Sketch mode select Project Geometry and then the Center Point (or the edges of the workplanes). Tie you geometry to the projected work geometry.

This is called the Base Orphan Reference Node (BORN) Technique.
In later releases of Inventor you can set the origin to project automatically. In SolidWorks and Pro/E that is also how it works.

When your sketch is fully constrained (geometry constraints and dimensions) the lines will change color.

I suggest reading this document - http://home.pct.edu/~jmather/AU2006/MA13-3%20Mather.pdf

particularly Tip #10.

[Mr T]

Well you may be thinking I'm wrong but I do this with every sketch !

Do you have different settings ?

I also use the AXIS > RMB sketch.