topic Re: Constrain sketch to another sketch on a perpendicular plane in Inventor Forum

Constrain sketch to another sketch on a perpendicular plane

wfp21 — Thu, 03 Feb 2022 19:05:34 GMT

I am unable to find a method to constrain two points on different sketches that are perpendicular to each other.

I want to force the centre of a rectangle (red circle) to lie on the tip of an eclipse (red dot) where each are on a different sketch and are perpendicular to each other:

Hope that makes sense. I have attached an ipt file in case.

Any suggestions appreciated.

Thanks, Will

Re: Constrain sketch to another sketch on a perpendicular plane

CGBenner — Thu, 03 Feb 2022 19:20:03 GMT

@wfp21

In Sketch1 place a work point at the top of the arc. Save that sketch. In Sketch3, project that point into the sketch, then use a Coincident constraint between the center of the rectangle and the projected point. Voila.

Re: Constrain sketch to another sketch on a perpendicular plane

SBix26 — Thu, 03 Feb 2022 19:30:01 GMT

A slight correction: you need a sketch point at the top of the ellipse (though a work point could be used, too). I see that you already have a sketch point constrained to the ellipse, but it's unconstrained otherwise. Project the Y-axis to Sketch1, and the sketch point to that line as well:

Now that point is firmly located at the top of the ellipse, and you can project it into the other sketch and constrain to it.

Sam B

Inventor Pro 2022.2.1 | Windows 10 Home 21H2

Re: Constrain sketch to another sketch on a perpendicular plane

CGBenner — Thu, 03 Feb 2022 19:51:44 GMT

@SBix26 @wfp21

You caught me.... I actually USED a sketch point, and just typed work point! It's been a long week already. Thank you for catching that!!

Re: Constrain sketch to another sketch on a perpendicular plane

wfp21 — Thu, 03 Feb 2022 20:58:34 GMT

Thanks for you very much for your quick replies but I am still rather confused!

How do I constrain my original sketch point in sketch 1? And then how do I project the Y-axis to Sketch1?

A screen-recording of how you solve it would be amazing.

Thanks again,

Will

Re: Constrain sketch to another sketch on a perpendicular plane

SBix26 — Thu, 03 Feb 2022 21:49:44 GMT

Use the Project Geometry tool while in the sketch, then pick the Y-axis from the browser
Best practice is to change the projected Y-axis to construction type so it's obviously not part of the ellipse profile
Start the Coincident Constraint tool and pick the sketch point that is already constrained to the ellipse, then the projected Y-axis; the sketch point will change color to show that it is fully constrained.
In Sketch3, use the same Project Geometry tool to project that fully constrained sketch point from Sketch1
Use the Coincident Constraint tool to constrain the center of the rectangle to that projected point

This is all really basic stuff-- have you had any training??

Sam B

Inventor Pro 2022.2.1 | Windows 10 Home 21H2

Re: Constrain sketch to another sketch on a perpendicular plane

wfp21 — Fri, 04 Feb 2022 13:36:32 GMT

I have had a little training but was unaware of the project geometry tool.

Projecting the point on sketch1 whilst in sketch3 made it visible for a coincident constraint.

Thanks for all your help

Re: Constrain sketch to another sketch on a perpendicular plane

SBix26 — Fri, 04 Feb 2022 20:28:50 GMT

It occurred to me later (middle of the night?) that there is no need for the sketch point or the Y-axis projection-- all that's needed is:

In Sketch3, use Project Geometry to project the elliptical arc from Sketch1; it projects as a line, ending at the top of the curve
Constrain the rectangle center to the endpoint of the projected line
Finished

Sorry about all the extra work instructions the first time around.

Sam B

Inventor Pro 2022.2.1 | Windows 10 Home 21H2