Downloaded from https://www.everyspec.com FM 1-509 3. Determine correct tube and fitting clearances (see Figure 2-3). Then cut the tubing. When cutting the tubing, the objective is to produce a square end that is free from burrs. Tubing may be cut with a tube cutter (Figure 2-4) or with a fine-tooth hacksaw (not shown). To use the tube cutter correctly, place the tube in the cutter with the-cutting wheel at the point where the cut is to be made. Tighten the adjusting knob so light cutter pressure can be applied on the tube; then rotate the cutter towards its open side.
As the cutter is rotated around the tube, continue to apply light pressure to the cutting wheel by intermittently tightening the knob. Too much pressure applied to the cutting wheel at one time may damage the tubing or cause too many burrs. After the cut is completed, remove all burrs inside and outside of the tube. Then clean the tube to make sure that no foreign particles remain. If a tube cutter is not available, a fine-tooth (32 teeth per inch) hacksaw may be used. After cutting the tubing with a hacksaw, remove all saw marks by filing. After filing, remove all burrs and sharp edges from inside and outside of the tube. Then clean out the tube and make sure that 2-5