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LOFTING / TWISTING A FLAT BAR

15 REPLIES 15
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Message 1 of 16
samuel777
3658 Views, 15 Replies

LOFTING / TWISTING A FLAT BAR

Hi,

I am not sure if lofting is the correct way of going about this.

I don't have a file to show you. I need to draw a flat bar 1/2 x 1/4 twisted 90 deg half way along the length.

How can I do that?

Thank you in advance

Sammy

 

Inventor 2014 sp2

15 REPLIES 15
Message 2 of 16
JDMather
in reply to: samuel777

Extrude the two straight sections.

 

Loft between the end faces to fill the gap, click on the Mapping tab of the loft command and map the correct point-to-point transistions.

Set to Tangent conditions (to the extrusions).

 

Attach your attempt here if you can't figure it out.


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Message 3 of 16
johnsonshiue
in reply to: samuel777

Hi! You can use Coil or Helical Path Sweep to do that. In R2015, you can apply Twist angle in Sweep.

Thanks!

 



Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer
Message 4 of 16
karthur1
in reply to: samuel777

I would use the Sweep feature with Twist added like this.

 

twisted bar.jpg

 

Kirk

Message 5 of 16
samuel777
in reply to: JDMather

Thank you all fof the prompt reply.

I couldn't figure out the sweep thing with a twist 🙂

I'm on 2014.

Extruding 2 sections & filling the twisted portion by lofting worked fine.

Again,

I thank you all for your quick help, wow:)

Sammy

Message 6 of 16
WILLIAMF
in reply to: samuel777

Old post I came across but I do  a lot of twisting of waveguide tubing.

How do you know  which way the twist is going? Clockwise or counter clockwise?

I know you can for example put 90- degree or -90 degree but some of the shop guys ask me to indicate direction as well.

It can get a little tricky

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Message 7 of 16
johnsonshiue
in reply to: WILLIAMF

Hi William,

 

It depends which end you are looking at. If I understood how Twist Sweep worked correctly, it is like looking at profile sketch from the start and into the path progressing direction. The twist angle should be a clockwise positive value.

Many thanks!



Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer
Message 8 of 16
WILLIAMF
in reply to: johnsonshiue

Thanks for verifying that. Have a look at the attached part. A waveguide assembly with bends- a soldered flexible section and a twist of 78.39 degrees. So two separate tubes with brazed on flanges.

Clockwise or counter clockwise. I guess what I was asking if the command line could indicate either clockwise twist rotation or counterclockwise.

It was explained to me its as if you are driving into a tunnel. Imagine the car direction following the path of the twist and that is the direction of the twist.

 

I think what you say" It depends which end you clamp down... and the other end is twisted. These always make me stop and think...

Thanks

Dell Precision 5820
Windows 10Pro
Quad Core Intel Xeon
32 Gb SDRam
NVIDIA Quadro
Product Design Suite 2019 Ultimate
Message 9 of 16
johnsonshiue
in reply to: WILLIAMF

Hi William,

 

My comment specifically applies to Twist Sweep. If the twist was created by other features or it is on an imported body, all bets are off. Since, there isn't any information on the body to identify the twist and how the twist was created. I was merely explaining how Twist Sweep works.

Many thanks!

 



Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer
Message 10 of 16
WILLIAMF
in reply to: johnsonshiue

Thankyou

I agree. The solid is a Creo imported IGES. My job is to create a working drawing to produce this part.

The part has no intelligence.

Dell Precision 5820
Windows 10Pro
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32 Gb SDRam
NVIDIA Quadro
Product Design Suite 2019 Ultimate
Message 11 of 16
DuncanAnderson
in reply to: samuel777

.

@JDMather

@johnsonshiue

just want to add an extra degree of complexity Smiley Tongue

 

Can this be done so that a Flat Pattern can be created ?

 

Duncan Anderson

"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 KBE (16 Apr 1918 – 27 Feb 2002)}
Message 12 of 16


@DuncanAnderson wrote:

 

...just want to add an extra degree of complexity Smiley Tongue

 

Can this be done so that a Flat Pattern can be created ? 


You might investigate the Inventor Beta http://beta.autodesk.com

Message 13 of 16

Hi Duncan,

 

JD is right. Currently, Inventor is not yet able to flatten non-cylindrical bend or non-developable faces. There is an alternative workflow involving the free Autodesk Mesh Mixer (meshmixer.com).

 

https://forums.autodesk.com/t5/inventor-forum/unfold-complex-surface/m-p/7249578#M652238

 

Or, you can sign up Inventor Beta and try the Unwrap workflow.

Many thanks!



Johnson Shiue (johnson.shiue@autodesk.com)
Software Test Engineer
Message 14 of 16

If this is not just an academic question and you really need this - I have figured out a better technique than the one demonstrated in the thread that @johnsonshiue linked and can create a video of my new technique.

Attach your *.ipt file if interested.

Message 15 of 16
via05306
in reply to: TheCADWhisperer

Hello,

I'm trying something similar as the original poster but twisting a flat bar in the mid section with 170° angle.  Would be interested in your having look at your method.

 

Message 16 of 16
TheCADWhisperer
in reply to: via05306

@via05306

You should have started a new thread and included a reference link to this thread.

Attach your *.ipt file here and I will demonstrate how to generate Flat Pattern.

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