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Frequently
Asked
Questions
- How are die sets measured?
Die sets are measured by outer diameter (OD) and center line
radius (CLR). OD refers to the outer diameter of the tubing
or pipe to be bent. The center line radius refers to the
distance from the center of the die to the center line of
the tubing. If you bend a piece of tubing 180 degrees and
measure from the center of one side of the tubing to the
center of the other, you will have the center line diameter.
Divide the center line diameter by two to get the center
line radius. A smaller CLR will produce a tighter
bend.
- What range of wall thicknesses can a particular die
set bend?
The minimum wall thickness required to make a nice smooth
bend depends on the OD and CLR. A chart of minimum wall
thicknesses for mild steel tubing and DOM can be viewed by
clicking "Die Sets" under one of the bender models listed on
the left. Bending tubing with less than the minimum wall
thickness can result in wrinkling or breaking.
- What is the difference between tube and pipe?
They are both round, but common round
tube is classified by outer diameter), and by wall thickness
(or gauge -- 13 gauge=0.095" wall). Pipe is often used for
liquid flow, so is classified by the inner diameter (ID),
and then by schedule, which designates standard wall
thickness. For example, a Schedule 40 1" pipe has an ID of
1" and an OD of 1.315". The OD is the measurement by which
we classify all die sets.
- What materials can be bent?
The most common material is mild steel, which is why you
will find minimum wall thicknesses based on that. DOM,
Chromolly 4130 and 303 or 304 Grade Stainless Steel can also
be bent. 316 Grade Stainless Steel can not be bent. If you
are using aluminum, please contact your supplier to
determine if the grade you are working with is bendable.
- Can you build custom die sets?
We can and do frequently build custom die sets. However,
custom dies cannot be guaranteed for perfect bend quality
since we have not tested them to the same extent as standard
die sets.
- Are die sets interchangeable between Models 3, 4 and
32?
Die sets are not interchangeable.
- What are those inserts made of? Is that aluminum?
No it is not aluminum, but sorry it's classified.
- How do I use this die set-- it has no drive holes?
Some dies have a center mounting hole plus several drive
holes, and some have the center hole only, due to the fact
they are too small for drive holes. How to use them is
explained in great detail in the Model 3 Manual. Click on
"Printable Manuals" under Manuals/Info on the left. Page 7
of the Model 3 instructions explains the bending
procedure.
- I've seen several benders that look very much like
your Model 3. What makes this the best?
There are several places that build a copy of our famous JD
Squared Model 3 Bender. The original Model 3 Bender was
designed in 1990 by JD Squared. Twenty years later, it is
still a top seller because it is an affordable, high quality
machine – just as it was designed to be.
Although other companies claim to have made improvements,
none have actually improved the quality of the bend and some
have actually only increased the cost. There is one thing we
provide standard with each die set that no one has been able
to replicate. We specially make the tube contact inserts in
the pressure die from a bearing-grade alloy that provides
unmatched tube support and protection from scratching and
galling.
  
If you are looking for the original, and the best, Model 3
Bender - it is right here at JD Squared.
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