Generate dynamically sized perforation

[Anonymous]

Hello guys!

I am designing a lightweight reinforcement and I would like to add rounded cutouts to it.

The situation is following - In the picture there is a side-view of the body (solid).

I would like to add perforation (cut holes) as it is on the second picture:

The circles have to be in the centre of the target body with constant gap between each circle, its size adjusted according to the target body.

My idea was to create first cutout in the centre of the target body and then use pattern command to generate the rest of the cutouts. The thing was that I was not able to make the cutouts dynamically resize to match the size of the target body. The all cutouts were the same size.

What is the correct workflow to achieve this in the Fusion 360?

Thanks in advance 

[TheCADWhisperer]

Are the edges for distance "A" arcs and lines or are they splines?

[Anonymous]

I am including a picture of the result to make the situation easier to imagine. (Sorry for quality)

[TrippyLighting]

It's not difficult to imagine what the end result is supposed to be, however the question is if the curves are splines or a combination of arcs and lines.

If you used arcs and lines this is relatively easy to do, however currently splines in Fusion 360 do not allow for a tangency constraint to a circle, which makes it tricky.

[TheCADWhisperer]

From that image it appears the answer would be splines.  Oh well, you are going to have a lot of construction geometry.

BTW - if you are on Windows OS ask Cortana about built in Windows Snipping Tool.

I suspect Mac OS has something similar for grabbing screen captures.

[Anonymous]

The edges are splines.

[TrippyLighting]

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@TheCADWhisperer wrote:

I suspect Mac OS has something similar for grabbing screen captures.

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Yes, Shift-Command-4.

[jeff_strater]

This is as close as I can come.  It's not perfect, by any means.

First, you will need spline fit points everywhere you want a perforation, because you can only dimension to a spline fit point.  Also, you cannot, today, dimension to the tangent points of a circle (coming, soon!), so you have to do some math to get the spacing between the circles and the splines:

Model is attached.

Jeff