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- Repeating elements around a circle?

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07-10-2008 08:34 PM

Greetings, all. First post..

I've just gotten started with SE2D (about ten hours of intense 'playing around'),

and I haven't yet found a good way to do what I want.

Basically, I want to have repeating elements at a particular radius at regular angular

intervals. Say, 10 holes around a flange. All the holes are the same diameter,

they're at every 36 degrees, and at the same radius. If the radius variable is

changed, they should all move in (or out); if their diameter is changed, they should

all change.

I've managed to get something like this by drawing two radii at the appropriate

angle, putting a hole at the intersection of the circle and one of the radii, mirroring

it all around, and setting all the holes equal to each other, but then they can't

be altered via the two variables. They look fine, as long as I don't need to tweak

them further.

There's the horizontal/vertical relationship; are there others that would help here?

Thanks!

6 REPLIES

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07-11-2008 01:16 PM

Here's a detail of part of the problem in the attached image. (In case it doesn't

work, you can also see it at http://tinyurl.com/6fe2qj )

The dashed circle is the one around which the 'holes' should be spaced at ever N

degrees; the dashed line is a radial I put in so I could place the hole. All the

holes need to be the same size, and at the same radius. How can I make such placements

more easily (without lots of temporary radials and mirroring), and tie them all

to common variables for diameter and distance? So far my thwacking around in the

bushes brings me up against 'conflicts with existing relationships.'

Part two, and sort of related:

The tiny circle has precise placement that I'm trying to automate, as well. It's

centred on the radial, and a certain distance from the hole's centre. However,

it also has a twin on the *other* side of the centre (now shown in the pic). Thw

two of them need to be equidistant from the circle's centre; if one gets dragged

farther out, the other needs to do likewise. Perfect for mirroring, but I can seem

to get relationships going that say 'the centre is always on the radial' and 'the

mirror point is at the intersection of the radial and the circle.' Trying to put

in a hidden tangent line to mirror about also gets me the conflict message.

A very cool tool, but I think I'm doing stuff more advanced than covered by the

tutorials. :-) The whole bit of 'model,' 'drawing,' 'view,' 'geometry,' and so

forth is new stuff to me; I'm used to just drawing on a sheet of paper. :-)

Is there a good, complete, book (or other source) from which I can learn 2D in detail

without worrying about 3D? Or is it all pretty much 'learn by doing and asking'

?

Thanks!

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07-15-2008 12:14 PM

Attached is a sample file, relationships.dft, for you to look at. It is a

V20 file.

I will try to explain some of the things I set up. It all works with

relationships.

Open the relationships.dft file.

I have placed different geometry on different layers to help organize the

display.

Construction layer - Contains the construction circles and lines.

Holes layer - Contains the holes.

Driving dims layer - Contains the dimensions that drive the model.

Driven dims layer - Contains the dimensiosn that are formula driven by the

driving dimensions.

The dimensions displayed are the dimensions that drive the model.

Dimensions are variables. Variables can drive dimensions, so dimensions can

drive other dimensions. You can define your own variables and formulas in

Variable Table. You can also define a formula directly on a dimension. Click

on Tools and then Variables at the top of the application window. This is

the variable table. You can see all the dimensions and how they are defined.

Close the variable table.

Click on the 6.000 diameter dimension and change the value to 7.000. This

dimension drives the smaller diameter construction circle. Notice that the

larger construction circle also changes. This circle has a dimension that is

defined to be equal to the smaller dimension + 1. The holes also move out

with the change.

Change the 1.5 diameter to 1.75. Notice that the larger hole circle changes.

It is formula driven by the smaller hole circle.

Change the 60 degree angle to 45 degrees. Notice that the spacing between

all the holes change to 45 degrees.

Click on The Layers tab to the far left in the edge bar. Click on Driven

Dims layer and then click on the Show Layer button to turn on the display of

the driven dimensions.

Notice that some of the dimensions are green. These dimensions are driven

dimensions. Right mouse click on the dimension for the larger construction

circle. You will see Show All Values, Show All Names and Show All Formulas.

There is also an Edit Formula. These allow you to change the dimension

display and modify the formula on the dimension.

You can also define a dimension formula by simply double clicking on the

dimension. Double click on the dimension for the larger construction circle.

You will see a Formula for this dimension "Driving_Dia + 1" without the

quotation marks. Delete the text for the formula. Leave the formula

definition field active. Click on the dimension for the smaller construction

circle. The name of the dimension is added to the formula. Key-in "+ 1"

without the quotation marks. You should see "Driving_Dia + 1". Press Enter

to dismiss accept the formula definition.

To simply set one dimension equal to another, double click on the dimension

that needs the formula. Click on the dimension you want it equal to. Press

Enter to accept the formula definition.

Double click on the green dimensions to see how ther are defined. Also look

at how the relationships are set up.

If you have any questions about the example, please ask.

Regards,

Rick B.

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08-11-2008 10:43 AM

Rick, your solution is elegant and very flexible, but shouldn't a simple bolt hole

circle, as desired by Ken, be possible with the "bolt hole circle" tool? I ask

this in part because I am unable to make this tool work. It just stops responding

at the second instruction (either "click for the radius point" or "click for the

second point" depending on the method chosen). Is this feature disabled in the

2D program?

John Hilgenberg

John Hilgenberg

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08-13-2008 09:19 AM

The bolt hole circle command is an annotation command. It creates the

circular centerline and center marks on an existing circular hole pattern.

It does not create a circular hole pattern.

Regards,

Rick B.

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08-14-2008 03:10 PM

Got it . . . Thanks. Let's put the circular pattern generator in the enhancement

queue!

John

"Rick B."

>John,

>The bolt hole circle command is an annotation command. It creates the

>circular centerline and center marks on an existing circular hole pattern.

>

>It does not create a circular hole pattern.

>

>Regards,

>Rick B.

>

>

John Hilgenberg

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08-15-2008 09:07 AM

There is a circular pattern command. It is under the drop list of the

rectangular pattern command.

Rick B.

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