Topic: Helix issue

[johnjoe]

HI,

Im having a problem extruding a non-circular shape around a helix. The shape I need to extrude is rectangular. Whenever I extrude a rectangle around a polyline helix (into solid form) the rectangle gets twisted. The rectangle starts off perpendicular to the axis of the helix and ends up twisted at an angle. I checked a number of furums and noticed other people had problems with helix's. Perhaps Autocad can't do this. If this is the case, is there a relatively easy way aound this. I'd like to point out that I'm not interested in extruding a circle. Id apreciate some feedback on this,

Thanks

[ELOQUINTET]

ah there ya go john sorry no answer for your question  

[CAB]

Click on this as it may be what you are looking for.

[hyposmurf]

Fuccaro again ,he'll have to say something soon on this forum,hey Fuccaro

[Fuccaro]

he'll have to say something soon on this forum

SOMETHING

[Fuccaro]

Johnjoe
If you wish to use that lisp you should read this first:
http://cadtutorforum.net/forum/viewtopic.php?t=477
Sorry, the program itself isn't well documented...
Good luck!

[hyposmurf]

I guess I was asking for that Fuccaro,nice to see you pop up up anyway

[CAB]

Welcome Fuccaro,

 I posted that link in with the code that I posted here.
I had the code but lost track of where I found it.
Thanks.

CAB

P.S.
I admire your talents programing with DCL as well.

[Fuccaro]

CAB
I never wrote a single DCL line in my life!
I learn VBA but not so fast as I wish. Until that I remain a lisper without DCL abilities.

[CAB]

A thousand pardons, a case of mistaken identity.
I was thinking of eduardo fernal but my memory
was playing tricks on me and I was too lazy to
look it up.

Sorry for the confusion.

CAB

[johnjoe]

Thanks Fuccaro,

Im new to autocad.  So its always a good idea to seek out some help. Tried on my pc and it worked a treat.  Must start programming some lisp.

TTYL

[daron]

...Must start programming some lisp.

TTYL

I like this guy.

[johnjoe]

By the way Fuccaro, did you add that other option that you were discussing  in the previous topic? Remember the flatness issue of the extruded object.  I noticed the helical object seems to get flatter the wider the axis of rotation.  

Thanks

[Fuccaro]

Sorry Johnjoe!
Try to stretch the shape in the opposite direction before the spiral extrusioin. In that Forum you will find a routine for this.