creating a 2d spiral

[Anonymous]

i would appreciate some advice on how to creating a 2D spiral sketch.

[Anonymous]

If you're trying to create a 3D spiral from a 2D sketch, investigate the coil tool first. It'll create a flat spiral from a axis and
a shape that defines the X-section.

The only other way I can think of is by using a spline and defining points. By dimensioning the defining points and linking the
defining point to an excel spreadsheet you should be able to create a spiral. But I don't know the Cartesian equations for a spiral.


--
Duncan
"Humour ... is one man shouting gibberish in the face of authority, and proving by fabricated insanity that nothing could be as mad
as what passes for ordinary living."
(Terence 'Spike' Milligan K.B.E., 1918-2002)
www.autodesk.co.uk/inventorjobs



wrote in message news:5166908@discussion.autodesk.com...
i would appreciate some advice on how to creating a 2D spiral sketch.

[Anonymous]

As Duncan said, use the coil feature and select spiral option.
If you need a 2D spiral, create a spiral section and project an edge onto a new sketch, then suppress the feature.
See pictures.

[Anonymous]

The dependant sketch is suppressed with the feature, so perhaps reducing the section dimensions after the spiral is created will suffice?

Derek

[Anonymous]

Instead of suppressing the feature, you can use Delete Face feature and
select Delete Lump option. In this way the feature dependency is maintained
but the body will be gone.

Johnson Shiue
Test Engineer
Autodesk, Inc.

wrote in message news:5167120@discussion.autodesk.com...
As Duncan said, use the coil feature and select spiral option.
If you need a 2D spiral, create a spiral section and project an edge onto a
new sketch, then suppress the feature.
See pictures.

[JDMather]

Something like this?

[Anonymous]

Geez JD!

Y'sure are using a lot of solids lately.
Y'feeling OK?

Why not a 3D intersection of a spiralled surf and an Origin Plane?

QBZ




wrote in message news:5167261@discussion.autodesk.com...
Something like this?

[Anonymous · Accepted solution]

->3D Sketch ->equation curve

x(t)=t*sin(t)

y(t)=t*cos(t)

z(t)=0

t min: 0   t max: 720    <-units are degrees

This will create a spiral with 2 rotations.

Obviously you can modify these equations to fit your specific needs, for instance if you want the curve diameter smaller you could do this:

x(t)=t*sin(t)/2

y(t)=t*cos(t)/2

z(t)=0

or if you want to shift the curve in a certain direction you can do this

x(t)=t*sin(t)+10

y(t)=t*cos(t)

z(t)=0

[TheCADWhisperer · Accepted solution]

@Anonymous

Equation curve did not exist 12 years ago.

Spiral Curve

[Anonymous]

Just throwing it out there in the case that someone in the present is trying to answer the same question.