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Bend Tool question (#4072)
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septemous  
#1 Posted : Friday, November 25, 2011 12:04:08 PM(UTC)
septemous

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This is probably simple, but how to you select which part of an object gets bent?

I expected whichever portion I clicked on to select the object, but that does not seem to be working.

For example I have a square post and want to bend the top half, but when I use the bend tool, it is bottom portion that gets bent away from its base.

Thank you
S_
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lgrijalva  
#2 Posted : Friday, November 25, 2011 3:16:29 PM(UTC)
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Use the option key on mac (control key on windows i think) to flip the bend side,

Also, I recommend use snap lines referenced to the surface of the solid to bend for better control, please look at the video.
External link, sorry, i was unable to upload the video to the forum, returns an error.

http://miditec.com.mx/sharkvids/bendtool.mov

Hope this help

Luis G.
Luis G
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septemous  
#3 Posted : Friday, November 25, 2011 5:37:31 PM(UTC)
septemous

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Thank you - so simple! LOL!
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Tim Olson  
#4 Posted : Saturday, November 26, 2011 2:55:15 PM(UTC)
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I've been working on a tips & tricks book. Attached are some tips in progress (still need to fix up the figures) regarding bending.
File Attachment(s):
bend.pdf (562kb) downloaded 8 time(s).

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septemous  
#5 Posted : Sunday, November 27, 2011 2:46:01 PM(UTC)
septemous

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very cool - would love to see the whole .PDF when it is ready!

FYI - Your tip works for the Right Hand only :)

Quote:
A trick I use to determine which portion will bend is to close your fist around the bend axis defined by the first and second point. Have your thumb point towards the first point. Your fingers curl in the direction the material is bent.


Thanks!
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Tim Olson  
#6 Posted : Sunday, November 27, 2011 6:35:59 PM(UTC)
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>>Your tip works for the Right Hand only :)

Yup, updated tip, thank you!

Tim
Tim Olson
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ZeroLengthCurve  
#7 Posted : Monday, November 28, 2011 12:33:14 PM(UTC)
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Neat.

But, I wish that somehow that applied to ACIS kernel fails (with unable to find a solution....) on thickening a large surface and strips of surfaces made in an attempt to reduce the work the kernel is facing.

As for bending, suppose someone has an "orange slice/peel"-like surface and wants to bend it inward or outward. Can the bending tool handle that? (I am not at my own computer which has VCP and maybe a still-in-time trial of Shark on it....) Or, is it meant only for FLAT items being bent?

This could apple to ship hulls, ornaments, jewelry, or exhibition booth designs, I suppose.
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Tim Olson  
#8 Posted : Monday, November 28, 2011 1:25:33 PM(UTC)
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>>Or, is it meant only for FLAT items being bent?

You can bend any geometry (nurbs,analytics, and law based surfaces). But it becomes more tricky placing the bend line for a given set of parameters that will still create a valid non self intersecting model.

Tim
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la mouche  
#9 Posted : Tuesday, November 29, 2011 2:46:16 AM(UTC)
la mouche

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Shark is an excellent tool designer for sure.

But be careful to be familiar with its features and know that it can not be used for functions
engineering calculations.

Please see my example.

The calculation result of the original volume is not the same after a bend, for example.
We must know.

Cordialy.

Antoine
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blowlamp  
#10 Posted : Tuesday, November 29, 2011 2:56:16 AM(UTC)
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Antoine.
Doesn't that happen because the material has been stretched by the Bend process and is thus correct?


Martin.
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la mouche  
#11 Posted : Tuesday, November 29, 2011 4:02:04 AM(UTC)
la mouche

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yes

but

in reality, a folded sheet of metal does not change [COLOR="Red"]volume[/COLOR] before and after folding ... :eek:

Antoine
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blowlamp  
#12 Posted : Tuesday, November 29, 2011 4:25:17 AM(UTC)
blowlamp

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I shouldn't have used the word 'stretched' in my reply - I should have used 'added' instead.

Agreed, it isn't a sheet metal tool as it doesn't allow for compression of the material.


Martin.
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Tim Olson  
#13 Posted : Tuesday, November 29, 2011 12:44:15 PM(UTC)
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>>a folded sheet of metal does not change before and after folding

My understanding is that this is dependent on the location of the bend axis. If you place the bend axis in the middle of the part using ViaCAD, your volume will remain the same before and after the bend. (compresses above the bend line, expands below the bend line)

The location of the bend axis is determined by the material and equipment setup and refereed to as the k-factor. Typical k-factors range from 0.3 to 0.5 where 0.5 places the bend axis in the middle of the part.
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la mouche  
#14 Posted : Wednesday, November 30, 2011 2:28:23 AM(UTC)
la mouche

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Quote:
My understanding is that this is dependent on the location of the bend axis. If you place the bend axis in the middle of the part using ViaCAD, your volume will remain the same before and after the bend. (compresses above the bend line, expands below the bend line)

The location of the bend axis is determined by the material and equipment setup and refereed to as the k-factor. Typical k-factors range from 0.3 to 0.5 where 0.5 places the bend axis in the middle of the part.



No
No
No

cordially
Antoine
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la mouche  
#15 Posted : Wednesday, November 30, 2011 2:39:21 AM(UTC)
la mouche

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hello,

I give here the topic dating back to 2009 with the same concern.

http://forum.punchcad.com/showt...p?t=1994&highlight=magic

Antoine
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rockyroad_us  
#16 Posted : Wednesday, November 30, 2011 2:44:14 PM(UTC)
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Maybe we can figure out bending the time-space continuum as Albert would have wanted to find. He he.
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ZeroLengthCurve  
#17 Posted : Thursday, December 1, 2011 12:41:30 PM(UTC)
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Assuming the plate is folded in the middle of its length, and the middle of its thickness (k factor), what happens to the volume under this scenario?

- find the location of the onset of bending from the middle of plate width

- on each side of the bend axis, peforate and remove that material and verify that the remaining two parts are of the same construction and flatness.

-- reproduce with an apprpriate radius, an inner and outer face's rail-sweeping curves, and sweep to the appropriate distance, and check the new volume.

Do the volumes add up, or is there a yet 3rd new volume?
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