D of Bend

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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: Centerline Radius / OD

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.

Examples

In many applications, lower D of bend valued radii.

In the import shown above the line with LENGTH_UNIT shows this:

#815=(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT($,.METRE.));

In this line, we can change the "$" character like this:

#815=(LENGTH_UNIT()NAMED_UNIT(*)SI_UNIT(.MILLI.,.METRE.));

Then save the file, then re-import the STEP file.

Import After Fix

This is how the imported part shows now: