topic Frame generator - Alignment does not update after change to sketch part in Inventor Forum

Frame generator - Alignment does not update after change to sketch part

chachaman — Mon, 16 Oct 2023 00:56:59 GMT

Hello,

I am designing a model a sloped structure. The final slope will only be decided later. So I cretaed a paramter called slope in the master sketch.

When designing the frame, I orient some members of the frame 90 degrees to other members. However, when I change the slope in the master sketch, the members do not conserve to original 90 degree aligment between themselves. it is off by the amount I vary the slope.

Off what surface, feature or plane should I align the frame members so that they update correctly when changes in the master sketch are made ?

Anyone have any insights ?

Re: Frame generator - Alignment does not update after change to sketch part

pcrawley — Mon, 16 Oct 2023 01:04:46 GMT

It's difficult to know what is not working for you without a model - or an example of what is going wrong. (Your screenshot appears to show correctly oriented frame members at 90 degrees to each other).

As a general rule for anything sloped, I create a Workplane at the required angle - then create the sketch on that Workplane. This means the sketch defines the rotation of all frame members. I've found using the "Aligned" function (when placing frame members) somewhat unreliable when a frame changes. Using sketch on a Workplane at the required angle hasn't failed me yet.

Re: Frame generator - Alignment does not update after change to sketch part

chachaman — Mon, 16 Oct 2023 01:27:30 GMT

My sketch is applied to a work surface instead of a work plane. The slope
parameter drives the angle of the work surface. Do you think that is a
good approach?

Re: Frame generator - Alignment does not update after change to sketch part

chachaman — Mon, 16 Oct 2023 01:39:38 GMT

These settings seem to do the trick: See image.....

Re: Frame generator - Alignment does not update after change to sketch part

pcrawley — Mon, 16 Oct 2023 02:03:48 GMT

That's ok - but this is the bit I have found unreliable when changing the angle of "anything" in your model:

If the sketch is created on the work surface (as opposed to a Workplane), then it should be perfectly Ok. You shouldn't need to select the "Align" function - just leave it blank.