Bulletin 4391-B400S
EXACTOL
®
400 Series Tube Benders
8
Parker Hannifin Corporation
Tube Fittings Division
Columbus, OH
www.parker.com/tfd
Thin Wall Tube Bending with Mandrel Equipment
Step 6: Mark Tube
Step 7: Clamp Tube
Step 8: Select Slide Block Groove
Step 9: Using the Tie Bar (if required)
These four steps are the same
as Steps 3, 4, 5 and 6 shown
on pages 4-5.
Step 10: Bend the Tube
Mandrel tube bending is easily accomplished by means of the crank
handle operating the mechanism through the 60:1 ratio worm gear. As the
bend is being made, the slide block travels with the tube and bears lightly
against the radius block to form a true round die enclosing the tube, pro-
viding a smooth, full cross-section bend.
Step 11: After Bending Tube
At the completion of the bend, remove the tie bar, retract the slide block
vise and unscrew the wing nut on the radius block clamp. Then, to
remove the tube, slide it out to the left, back along the axis of the mandrel
assemble. Loosen the mandrel assembly if necessary to facilitate tube
removal.
Step 5: Adjust Adapter Slide
Loosen the Allen head screw in slide adapter base and move the bender
to adjust for the radius block in use. Position the slide indicator pointer to
the radius of the radius block being used, in order to properly center the
radius block with respect to the tube and mandrel rod. Then tighten the
adapter slide screw with the Allen wrench.