Drawing a 3D thread

[robrodd]

why does my triangle twist when i attempt to sweep it along the helix to cut a thread????

[Sittingbull]

did you check the twist option?

 

Select objects to sweep or [MOde]:

Select sweep path or [Alignment/Base point/Scale/Twist]: twist

Enter twist angle or allow banking for a non-planar sweep path

[bank/EXpression]:

[robrodd]

must i put a twist in it? i've selected yes for the alignment option and base point is the top of the triangle. the turn height is 1.5001 and the isoceles triangle has sides of 1.5. don't know what i'm missing!

[robrodd]

here's an isometric of it

[Sittingbull]

I don't think the twist is what's bothering you, but maybe the bank option.

What options are you getting at the command prompt?

 

Something like this:

Select objects to sweep or [MOde]:

Select sweep path or [Alignment/Base point/Scale/Twist]: twist

Enter twist angle or allow banking for a non-planar sweep path

[bank/EXpression]:

 

or something like that:

 

Select objects to sweep or [MOde]:

Select sweep path or [Alignment/Base point/Scale/Twist]: twist

Enter twist angle or allow banking for a non-planar sweep path

[bank/EXpression]:

 

Could you eventualy upload the file, please?

 

Regards,

 

SB

Edited February 25, 2011 by Sittingbull
quote

[robrodd]

here it is

Screw2.dwg

[Sittingbull]

Like i said, it's the banking.

Select sweep path or [Alignment/Base point/Scale/Twist]: twist

Enter twist angle or allow banking for a non-planar sweep path

[bank/EXpression]:

 

Edited February 25, 2011 by Sittingbull
pict

[Organic]

Why the twist in it?

[Sittingbull]

Why the twist in it?

 

To get to the banking option part?

[robrodd]

what do i set the banking angle to or do i sweep in different plane?

[Sittingbull]

...

 

Command: sweep

Current wire frame density: ISOLINES=4, Closed profiles creation mode = Solid

Select objects to sweep or [MOde]: 1 found

Select objects to sweep or [MOde]:

Select sweep path or [Alignment/Base point/Scale/Twist]: t

Enter twist angle or allow banking for a non-planar sweep path

[bank/EXpression]: 0

Select sweep path or [Alignment/Base point/Scale/Twist]:

 

What is not clear here?

[ReMark]

Did you try setting it to "0"?

[robrodd]

sorry, only read your response properly now.... i set me banking / twisting angle to 0, but it still twists

[ReMark]

That's OK. Try this experiment. Scale the triangle you want to extrude using a scale factor of 99% then extrude it. Does it still twist? Just curious.

[Sittingbull]

I managed to do it with your file though.

As the the turn height is 1.5001 and the isoceles triangle has sides of 1.5, it does the trick.

I wonder what parameter would make that triangle twist.

Can you make a screenshot of the shape you're getting? Or use jpgout.

 

Regards,

 

SB

 

Edit: Ooooops...

My bad, it does twist actualy...$

Back to the drawing board...

Edited February 25, 2011 by Sittingbull
Dang

[Sittingbull]

Ok, finaly got it.

It's not realy twisting, see. It 's only rotated on 90°.

You have to realign it on the same ucs than the helix.

 

 

 

Sorry if i got u confused.

Regards,

 

SB

[robrodd]

you've still got me confused... i'm not getting this... it's gone over my head so many times, i'm going bald!

[robrodd]

i notice you guys are using autocad 2011, i'm using 2007. has that not got something to do with it?

[robrodd]

remark

 

as far as i know, one can only extrude in one plane, not multi-planes

[ReMark]

You can EXTRUDE along a helix using the path option. Here's an example.