Once released, the carriage can no longer support the tail end if the tube during a bend. This situation is highlighted when a CNC tube bender’s carriage releases the tube before the last bend is made. Therefore, adjusting the carriage to a greater CLR can sometimes eliminate wrinkles. This is due, in part, to the softness of some grades of copper. If the alignment of the carriage is too far away from the pressure die during bending (non-mandrel bending), then wrinkles may occur.
This is because the aluminum can withstand greater compressive forces on the inside of a bend before the inside wall itself starts to wrinkle.Īlso, the position of the carriage on a CNC bender can influence wrinkles when bending copper. NEC 300.34 / Graph below ) 7.216 (MBR) Minimum Bending Radius. of Wire (0.902 Inches) x Cable Multiplier of 8X O.D. Minimum Bend Radius for 500 MCM THHN is the O.D. 035” wall can often be bent to a tighter radius then soft copper. With this in mind, we see that the graph says we would use the table for NEC 300.34 after making our determination. , and 3, 6, 8, 10, and 12 mm outside diameter tubing in a variety of wall thicknesses. When bending copper, the compressive forces on the inside of the bend can tend to give way sooner as the centerline radius becomes smaller.Īs an example, a ؽ” aluminum tube with a. The Swagelok hand tube bender bends 1/8, 1/4, 5/16, 3/8, and 1/2 in. The yield strength of the material being bent can directly influence whether there are wrinkles or no wrinkles. There are other factors that can influence the quality of a bend. However, for consistent production results, keeping the D of bend greater than 2 can disperse of several long-term headaches.
It is possible to bend the ½” diameter copper tube above to a smaller radius.
0 kommentar(er)
