Rounds The 'double cut' action ensures the tube is dimple free with a high quality finish. During the cut cycle the tube is clamped by a set of 'jaws', these hold the tube securely and provide a shearing edge for the blades. The cut is actually performed by removing a 'slug' (piece of material) approximately equal to the thickness of the blade. The blades and jaws work through a cut cycle as shown in the diagrams. The horizontal blade pulls across the top of the tube, in the process it removes or 'scarfs' a portion of the tube wall (1A to 1C), it does not cut completely through. Once the horizontal blade is in the extended position the vertical blade passes through the tube, entering at the previously scarfed position (the weakest point). As the vertical blade enters the tube a 'slug' is produced as shown (1D to 1G). At the end of the cut the slug is disposed of through the bottom of the dieset into a waste container. The dieset then returns to its open position with both blades ready for the next cut, the typical cut cycle time for a Thermatool Alpha shear is 700 milliseconds. Squares & Rectangles To achieve a distortion free cut on a square or rectangle the point of impact must be on the corner as it is the strongest part of the section. The horizontal blade is therefore not required for cutting profiles. With many tube mills the profile will exit the line with the flat uppermost, in these cases a 45 degree inclined shear will be required to facilitate cutting of profiles corner first. It should be noted that the selection of vertical blade is important when cutting any profiles. Thermatool will be pleased to advise on any application. © 2002 Thermatool Legal Agreement Contact: info@ttool.co.uk