When repairing thin lines (such as a car or refrigerator), it would be good to have on hand a small pipe cutter, and for connection of pipes with swivel nuts — device for rolling. Not hurt in a home workshop and a small vise. All of these devices can be made in the form of a set of interchangeable tool based on a simple clamp of suitable size (or specially manufactured). The design will need slight modification for mounting of tools for different purposes. In the first place must be milled afterwards the groove under all replacement fixtures (cage support rollers, rolling, vise) and drill a hole for the stopper.
Race knife-cutter and supports pipe rollers are made of steel 3 or steel “45” and the rollers — of steel “45”. In the middle of each of them is turning to at the moment of rolling on the tube, they did not swallowable the groove cut by knife. The knife itself needs to be firm enough, so its better to make it using carbon tool steel “U8” (“silver”) or “U10”. After making the knife, tempering, heating with a blowtorch or burner household gas stoves. Quenching is in water. It should be remembered that molten metal from the surface of the product fades, so the thickness of the cutting edge of the workpiece it is necessary to leave not less than 0.5 mm; Polishing and sharpening are performed after tempering, a small whetstone, rotating the billet of a knife, put on the screw with the nut and clamped in the Chuck of a drill. If the result of the heat treatment the knife is very fragile and he painted the cutting edge, it must be released, by heating with a blowtorch or on a gas burner to slaboalkogol (“straw”) color.