Can-Am Tube Tech

Mandrel and Wiper Die Selection Guide

The values on this chart are fairly conservative. The following factors can reduce the number of mandrel balls required and/or the need for a wiper die:

• Operator skill and experience
• Machine condition
• Bend lubrication type
• Use of "heart" or elliptical shaped tool sets
• Use of grooves in the bend die that form wrinkles on the inside of the bend

The CLR Ratio is the centerline radius of the bend divided by the tube outside diameter.

The Wall Ratio is the tube outside diameter divided by the tube wall thickness.

KEY:

P IS A PLUG MANDREL (NO MANDREL BALLS)
"X" B IS THE NUMBER OF BALLS ON THE MANDREL
C "X" B IS A CLOSE PITCH MANDREL
XC "X" B IS AN EXTRA CLOSE PITCH MANDREL
W IS A WIPER DIE