I recently purchased a JD2 Model 3 tube bender and
wanted to convert it to hydraulic operation. I wanted
to be able to make single shot bends of greater than
90 degrees without resetting the cylinder or repinning
I designed and built a metal stand to support the
bender and hydraulic equipment and also hold all the
parts for three bending dies. The stand is about 36"
high x 40" long x ~27" wide at the base. It rides on
casters so I can roll it around as needed.
I laid out the Model 3 bender on the floor and studied
the geometry a little to figure out my cylinder size and
Movement is controlled by a standard 4-way valve that is spring loaded to return to center.
I made hangers to hold three dies on the side and their followers
on the end of the bender frame.
A switch located on one end turns the pump on and off.
The bender works great in all aspects, except I made one mistake.
I didn't allow enough room in the frame box that holds the fixed
bender link to clear the follower for a 2" die. Here you can see
where I plasma cut a chunk out of the box to allow for more clearance.
Needs a little cleanup.
Here are the parts I used to build my bender:
Hydraulic pump (Northern Tool part #105871-B959)
1 HP 115/230V, 1.5 gal reservoir, 1.25 gpm, max. 2000 psi
(Note: Northern does not pack these well and they are often damaged in transit.)
Hydraulic cylinder - Prince model # SAE9224
(Northern Tool part #909224-B959)
3" bore x 24" stroke with 1" dia attachment pins, ½" working ports
(may or may not come with reducer bushings shown below)
4-way control valve (Northern Tool part #2010-B959)
1000 to 3000 psi relief valve, ¾" inlet/outlet, ½" working ports
Four ½" x 24" 2-wire hydraulic hose (Northern Tool part #50124-B959)
(may need one longer hose depending on your layout and ram movement)
NUMBERS IN ( ) CORRESPOND TO LABELS IN DRAWING BELOW.
(1) Port return plug (Haldex Barnes part #1300191)
Copyright (c) 2002 by Jay Kopycinski, All Rights Reserved.