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## Inventor General

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Message 1 of 13 (299 Views)

# calculating distance using rectangle pattern

299 Views, 12 Replies
04-16-2012 11:24 AM

When using the rectangular tool how do i calculate equal distances between each Fin.The picture shows 11 Fins but they are not equal distances between each Fin which causes the Fins to be higher on the right side.Which formula / calculation do i need to use in Rectangle Tool to produce equal distances between each fin and therefore the 1st and 11th fin are in the same position on each side of the cylinder.Using Inventor 2012

Regards,

Paul

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Message 2 of 13 (291 Views)

# Re: calculating distance using rectangle pattern

04-16-2012 11:41 AM in reply to: paulcasaqua

I'd make parameters for Chord_Length and Fin_Thickness.

When you pattern the extruded feature, set the last dropdown box to "Distance."  Then set the distance to Chord_Length-Fin_Thickness.

Or if you're patterning in the sketch environment (not recommended), you would use (Chord_Length-Fin_Thickness)/(Num_Fins-1)

-Using Autodesk Inventor Professional 2012
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Message 3 of 13 (288 Views)

# Re: calculating distance using rectangle pattern

04-16-2012 11:43 AM in reply to: paulcasaqua

Something like this?

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Message 4 of 13 (278 Views)

# Re: calculating distance using rectangle pattern

04-16-2012 11:57 AM in reply to: nannerdw

Hi Nannerdw

Thanks

I attached your example and it works

Paul

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Message 5 of 13 (271 Views)

# Re: calculating distance using rectangle pattern

04-16-2012 12:05 PM in reply to: JDMather

Hi JD

Yes that works good as well.

How did you achieve / measure the curve length at 117.000mm

Thanks

Paul

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Message 6 of 13 (260 Views)

# Re: calculating distance using rectangle pattern

04-16-2012 01:37 PM in reply to: paulcasaqua

paulcasaqua wrote:

Hi JD

How did you achieve / measure the curve length at 117.000mm

I didn't.  I let Inventor do the work.

The other solution presented looked like too much work to me.  I am lazy, I try to avoid work.
Edit the feature and expand the Pattern Feature dialog box completely.  Examine the settings.

Also examine Sketch2 and click on the line that I added to highlight it.
You will notice that one end goes the midpoint of your rectangle and the midpoint of that line is also constrained to the vertical line.  That gives the distance that Inventor Measures as Curve Length in Pattern.
All geometry solution - no calculations. I avoid calculations to the extreem when I can find a geometric solution.

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Message 7 of 13 (210 Views)

# Re: calculating distance using rectangle pattern

04-17-2012 09:33 AM in reply to: JDMather

Thanks JD

Yes simple and easy but very effective

Paul

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Message 8 of 13 (206 Views)

# Re: calculating distance using rectangle pattern

04-17-2012 09:34 AM in reply to: paulcasaqua

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Autodesk Inventor 2014 Certified Professional
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Message 9 of 13 (201 Views)

# Re: calculating distance using rectangle pattern

04-17-2012 09:42 AM in reply to: JDMather

JD

Not a school project.Self educating

Cheers

Paul

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Message 10 of 13 (173 Views)

# Re: calculating distance using rectangle pattern

04-18-2012 08:01 AM in reply to: paulcasaqua

The attached example is again using Rectangle Pattern tool.This time i want the pattern to go along a straight edge with same distance between the holes.I used the Curve Pattern and the result gave same distance between each hole.Can using Spacing and Distance also give the same result as the Curve Length?

Paul

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