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1-Newbie

Spiral features ProE Wildfire 2.0

I'm looking to create an archimedes spiral feature in ProE 2.0. I've looked everywhere and can't seem to figure it out. The helical sweep only makes springs, so not sure how I can make it. Thanks in advance! Jay
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13 REPLIES 13
11-Garnet
(To:ptc-1789647)
I'm not sure what you mean by &quot;the helical sweep only makes springs&quot; - it makes whatever section you sketch, surely? If you're trying to model an auger (like a grain elevator, or archimedes water screw) then I'd probably start by revolving a solid &quot;blank&quot; and then using a helical sweep to cut away the slot (you'll need to leave a solid 'core' to stop it becoming a spring!). Really, this is just a male screw thread where the thread depth is nearly equal to the outside radius - and you can certainly use the helical sweep to model a screw thread.
Insert a DATUM CURVE feature by EQUATION, using the CARTESIAN type, and use a similar sets of equations as shown below. x=5*t*cos(10*t*360) y=5*t*sin(10*t*360) z=0 The 10 above controls number of complete turns, the 5 is straight line distance from the start of the curve to the end of the curve, or in this case 0.5 between successive turns. Once you have the desired curve you can sweep a section along it.
1-Newbie
(To:jrichard)
Check out this example of how to do it!
1-Newbie
(To:ptc-1418735)
Here's some interesting info on the spiral: http://www.math.hmc.edu/~gu/math142/mellon/curves_and_surfaces/curves/archspiral.html Or, another explanation: spiral of Archimedes n (Mathematics) Maths a spiral having the equation r = aÎ¸, where a is a constant. It is the locus of a point moving to or from the origin at a constant speed along a line rotating around that origin at a constant speed If the above explanation is correct, the easiest way to make one is to not use a curve by cartesian equation as suggested above, but by a cylindrical equation as in: r = t * 1 theta = t * 1 * 360 z = 0 where the &quot;1&quot; in &quot;r = t * 1&quot; means the distance from the Z axis of a coord sys goes evenly from a value of 0 to 1 (or any number you choose), and &quot;theta = t * 1 * 360&quot; means there is a single counterclockwise turn of 360degrees starting at the X axis where you can easily vary the number of turns by substituting any real number (i.e. 1.5 or 3 etc.) for the number of turns. If you wish to enter the degrees of the rotation directly instead of basing it on complete turns as I've shown above, you can simply enter it as: theta = t * 360 for one full turn, 720 for 2 turns etc. Have fun!
1-Newbie
(To:DELETEME)
Not so much easier, just a different method. I'd rather use cartesian coordinates when explaining curves because most people model in a cartesian world. Conversion between cylindrical, spherical and cartesian is pretty simple. The good thing is that Pro/E can handle these 3 types, and if you don't know how to convert them, it's no big deal. If you wanted to use a cyclindrical type equation I would suggest the following, in keeping with the general form of the Archimedes equation. n=8 a=5 theta=t*n*360 r=a*theta &quot;n&quot; is number of turns &quot;a&quot; is distance between turns Having no &quot;z&quot; value defaults to z=0, which makes this cylindrical equation a polar equation. Defining any non-varying &quot;z&quot; value would do the same.
1-Newbie
(To:jrichard)

"Jonathan Richard" wrote:

Not so much easier, just a different method. I'd rather use cartesian coordinates when explaining curves because most people model in a cartesian world. Conversion between cylindrical, spherical and cartesian is pretty simple. The good thing is that Pro/E can handle these 3 types, and if you don't know how to convert them, it's no big deal. If you wanted to use a cyclindrical type equation I would suggest the following, in keeping with the general form of the Archimedes equation. n=8 a=5 theta=t*n*360 r=a*theta &quot;n&quot; is number of turns &quot;a&quot; is distance between turns Having no &quot;z&quot; value defaults to z=0, which makes this cylindrical equation a polar equation. Defining any non-varying &quot;z&quot; value would do the same.

1-Newbie
(To:DELETEME)
Whoa, folks! We're holding a conversation about two different topics: an Archimedes Spiral and an Archimedes Screw. Which is it you are trying to create, Jay? If it's a screw, one of the easiest things to do is create a spiral Surface, then Thicken it.
1-Newbie
(To:DavidButz)
Jay, If this is what you are looking for, Insert/HelicalSweep/Surface with a straight line as a section, Thicken. David
1-Newbie
(To:DavidButz)
Great feedback David and C M.
1-Newbie
(To:jrichard)
And, just for fun, if you want to combine the two (Spiral and Screw):
1-Newbie
(To:DavidButz)
I'd love to attach a file, but I have never been able to here. Oh well.......
1-Newbie
(To:ptc-1418735)

Thanks Mark! Thats the one I was looking for. Never thought of creating a sketch first.

1-Newbie
(To:ptc-1789647)

Thank you everyone for input, sorry for the late reply.

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