TPT January 2024

Precise tube and pipe cutting improves material efficiency MBS has developed a new generation of orbital saws for tubes and pipes that help ensure precise cuts, small cutting gaps and minimum blade costs. The first of these machines was recently put into operation at a filtration pipe manufacturer’s site. MBS has successfully completed the turnkey supply of its first new-generation MM orbital saws for automatic thin-walled pipe cutting. The integrated solution comprises an inclined pipe feeding device, the sawing unit, which rotates around the central pipe axis, and the discharge of the cut pipe sections up to the point where they are picked up by a robot. In contrast to conventional circular saws, orbital cutters use two small, thin blades arranged opposite from each other. They operate with a very small sinking depth into the pipe cross-section. This results in high material efficiency and, due to the exact blade guiding, in a much more precise cut. The ball bearing spindle of the machine operates with a positioning accuracy of +/-0.07mm. This ensures that the saw is also suitable for cutting pipes into sections intended for automatic welding onto flanges and required to comply with extremely tight cutting gap tolerances. A further important benefit of orbital saws is that they do not affect the roundness of the pipes, even if the pipe walls are as thin as just 0.7mm. This is possible thanks to the high precision with which the pipes are clamped and to the small blade diameter. According to Marc Hoffmann, managing director of MBS GmbH, orbital cutters provide a number of benefits compared to circular saws: “To cut a 170mm-diameter pipe featuring a 3.2mm thick wall with a circular saw, I would need a 580mm diameter blade costing around €500. In contrast, our new orbital cutters use two 1.6mm thin blades of only 80mm diameter that cost less than €30 each. These blades achieve a more accurate cut and, as a result, smoother cut faces.” With a view to the relative loss of material, the shorter the sections into which a pipe is cut, the more important the blade thickness becomes. Consequently, particularly high cost savings are achieved when cutting pipes into narrow rings.

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The two small cutting blades, arranged opposite each other, operate with a very small sinking depth

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