Spiral 3D Archimedes Screw

[astone15]

How do I go about drawing a 3D archimedes, spiraling screw in Pro-E (Wildfire 3.0)?

-Thanks

 

[trillicomm]

upload a picture

 

[vlad1979]

Maybe this will help with the dimensioning.


[url]http://en.wikipedia.org/wiki/Archimedes%27_screw#Mathematics _behind_the_screw[/url]


[url]http://upload.wikimedia.org/wikipedia/en/6/6d/Main_measures_ screw.jpg[/url]

 

[dr_gallup]

Looks like a helical sweep will do it nicely.

 

[kale.mahesh]

try this in


datum curve > from equation


x=t*360*cos(6*t*360)


y=t*360*sin(6*t*360)


z=t /* this is for height u can keep this zero for 2d spiral

Regards


Mahesh


kale.mahesh.googlepages.com

 

[SRINIVASANIYER1]

Dear Mahesh,


As I understand, the archemedian spiral has the equation r= a*theta (I have been away from pure maths for more than 20 yrs).


Where theta is the angle in radians.


When expressed in cartesian co-ordinate system, it becomes...


x= a*theta*cos(theta)


y= a*theta*sin(theta)


z= 0 (for 2D)


The above equation has an end point at the ORIGIN.


Expressed in parametric form... this should become


x=50+t*360*cos(t*360)
y=50+t*360*sin(t*360)
z=t*360 (can be zero for 2D)


where 50 is an offset given by me from the origin.


So much for the archemedian spiral.


--------------------


From the posts above, it looks like an Archemedian Spiral is different from an Archemedian Screw... or is there a ralation...?


I am confused with respect to the pitch. does it havea constant pitch?


I am uploading a WF2 file...


2007-07-30_033647_archemedian_spiral.prt.rar

 

[SRINIVASANIYER1]

more information on the screw... Nothing to do with an archemedian spiral.


[url]http://math.nyu.edu/~crorres/Archimedes/Screw/conveyor/conve yor.html[/url]


You should be able to do this with a plain helix.


I shall try to post it later when time permits.


In the meanwhile refer to an article by S K Nawaz in the Mcad central..


[url]http://www.mcadcentral.com/articles/templates/proe.asp?artic leid=13&zoneid=2[/url]