Difference between revisions of "D of Bend"

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(What is D of bend?)
(Notes)
 
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Some tube fabricators also say "D factor" to mean the same thing.
 
Some tube fabricators also say "D factor" to mean the same thing.
  
It is a ratio calculated like this: ''Centerline Radius / OD''
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It is a ratio calculated like this: '''D of bend = Centerline Radius / OD'''
 +
 
 +
<br><br>
  
 
==How Is It Used?==
 
==How Is It Used?==
The D of Bend value helps fabricators know if the radius is tight or large compared to the OD. It serves as a general guide for how difficult it will be to create a quality bend. It helps fabricators know what kind of tooling will be necessary to achieve the bend.
 
  
It is also helpful for designers as a limit for what is practical.
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===FOR FABRICATORS===
 +
*The D of bend value helps fabricators know if the radius is tight or large compared to the OD.
 +
*It serves as a general guide for how difficult it will be to create a quality bend.
 +
*It helps fabricators know what kind of tooling will be necessary to achieve the bend. It is useful, therefore, in building quotations for customers.
 +
*It is common for fabricators to share the lower limit of their D of bend capabilities with customers.
  
==Examples==
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===FOR DESIGNERS===
In many applications, lower D of bend valued radii.
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*It is helpful to designers as a limit for what is practical in choosing radii.
  
In the import shown above the line with LENGTH_UNIT shows this:
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<br><br>
 
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<pre>
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#815=(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT($,.METRE.));
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</pre>
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In this line, we can change the "$" character like this:
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<pre>
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==Example Values==
#815=(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT(.MILLI.,.METRE.));
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In most applications, a lower D of bend valued radii is less complex and therefore less expensive.
</pre>
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Then save the file, then re-import the STEP file.
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*D of bend = 2.00 or greater is generally considered not difficult.
 +
*D of bend = 1.50 is moderately difficult.
 +
*D of bend = 1.00 is difficult.
 +
*D of bend = 0.75 is very difficult and much more expensive.
  
==Import After Fix==
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===Notes===
 +
*D of bend values at 1 and below are possible - but are rare and require special benders that can press material into the bender's dies.  (Most call this "carriage boost".)
 +
*Other variables, like wall factor, impact what is difficult.  Wall factor = OD / Wall Thickness
  
This is how the imported part shows now:
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==Example Models==
  
[[image:VTube-STEP_FixedScale.png|600px]]
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[[image:DofBend001.png|600px]]
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[[image:DofBend002.png|600px]]
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[[image:DofBend003.png|600px]]
 +
[[image:DofBend004.png|600px]]
  
 
<br><br>
 
<br><br>
  
 
=Other Pages=
 
=Other Pages=
*
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* [[VTube-LASER]]
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* [[VTube-STEP]]

Latest revision as of 15:49, 2 January 2020

Contents

What is D of bend?

Tube fabricators sometimes indicate the centerline radius using D of bend.

We say it by speaking three words: "D of bend".

Some tube fabricators also say "D factor" to mean the same thing.

It is a ratio calculated like this: D of bend = Centerline Radius / OD



How Is It Used?

FOR FABRICATORS

  • The D of bend value helps fabricators know if the radius is tight or large compared to the OD.
  • It serves as a general guide for how difficult it will be to create a quality bend.
  • It helps fabricators know what kind of tooling will be necessary to achieve the bend. It is useful, therefore, in building quotations for customers.
  • It is common for fabricators to share the lower limit of their D of bend capabilities with customers.

FOR DESIGNERS

  • It is helpful to designers as a limit for what is practical in choosing radii.



Example Values

In most applications, a lower D of bend valued radii is less complex and therefore less expensive.

  • D of bend = 2.00 or greater is generally considered not difficult.
  • D of bend = 1.50 is moderately difficult.
  • D of bend = 1.00 is difficult.
  • D of bend = 0.75 is very difficult and much more expensive.

Notes

  • D of bend values at 1 and below are possible - but are rare and require special benders that can press material into the bender's dies. (Most call this "carriage boost".)
  • Other variables, like wall factor, impact what is difficult. Wall factor = OD / Wall Thickness

Example Models

DofBend001.png DofBend002.png DofBend003.png DofBend004.png



Other Pages