Measurement of material dimensions

A method for determining material dimensions of a tube (2) during a sawing process with a tube cutting machine, wherein

• a circular saw blade (3) is fed forward,
• the tube (2) is, in the course of feeding the circular saw forward, cut by the circular saw blade (3) along a saw groove;
• feed position data (s1, s2, s3, s4) of the circular saw blade (3) is determined along a feed path (s) of the circular saw blade,
• during the sawing process, further measurement data from the group of sawing force (Fs) or another variable (Ms) that corresponds to the sawing force (Fs) is determined,
• characterised in that
• an actual profile of the tube is determined from the feed position data (s1, s2, s3, s4);
• the further measurement data (Fs, Ms) along with the diameter and the thickness of the tube (2) to be machined are input into the tube cutting machine;
• target profile associated with the diameter and wall thickness input is determined in a database;
• the target profile is compared with the actual profile and in case of any deviations that are above a predefined tolerance, a warning signal is output;
• and
• extremal values are determined from the actual profile and the material dimensions are determined from the feed position data (s1, s2, s3, s4) of the extremal values;
• wherein a wall thickness (t) of the tube (2) is determined from the difference between the feed position data of the start of the cutting process (s1) and the feed position data of a first maximum value (s2).