Dimensioning a variable radius

2D plans Sizing
1

Hi all

I'm having a problem with the sizing of a spline. I know that the subject has already been mentioned but I would have liked to have had a recent opinion.

In addition to the plan provided in DXF, I would have liked to provide a classic drawing view and thus allow the machinist to program a trajectory rather than using the "point by point" of the machine.

The only solution I found was to sketch a spline on the drawn path, dimension the control points in ordinal dimension, and then retrace an arc of curve coinciding with the control points of the spline.

Problem: I can't put my arc tangent to my spline, the dimensions change with each try by a few millimeters...

Is there a particular solution for this kind of situation?

Thank you in advance for your help!

Image link: http://www.casimages.com/i/160728100620365353.png.html

2

Hello

Rather than sketching a spline, why not make constrained points on the curve, and then lay simple horizontal dimensions and vertical dimensions?

1 Like
3

Thank you for your answer.

I can sketch coincident points on my curve, but I can't put my arc tangent to this curve: "The sketch could not be updated because its resolution would result in invalid geometry (such as a line of zero length)."

The points were obviously not dimensionally constrained.

4

I was just talking about drawing points on the path, without creating an arc.

5

That would give us a straight trajectory, wouldn't it?

I would need a shelf to make this piece

Or I don't understand the meaning of your approach =/

6

If I understand correctly, you have a trajectory at the base, on which you want to draw an arc, right?

 

7

Yes, that's right, like on the screenshot in my main message.

The file was sent to me in STEP, I don't know if my complications can come from there...

8

The goal of the bow is to be able to put points?

9

The purpose of the spline is to put points (with constant spacing), while the purpose of the arc is to be able to get a radius, but the arc must be tangent to the spline to be as accurate as possible.

That's my problem