MEFOS has developed a fast, reliable and inexpensive straightness meter for bars and tubes. This version of the apparatus, which is patent pending, is made for rounds of 90-mm diameter. Other models are equipped for measurements of varying dimensions. The apparatus is manually operated.

The apparatus has a built-in electronic device for data acquisition and data processing. The device can store measurements from several bars and tubes.

The raw data from the BT straightness meter can be transferred to a PC by a serial line. The communication is handled by the included software package. Programs for evaluation and plotting of the measurement results are included.

It is also possible to detach the electronic device from the apparatus and connect it to a PC. All the data can be transferred to the PC and the evaluation can be performed directly on the screen by the software package.

The BT straightness meter is equipped with special differential transformers measuring the bar curvature in two directions. Properly calibrated, the maximum error is a curvature of 16 ��m per meter bar length. If the error is systematic this gives a straightness accuracy of 2.5 mm over a bar length of 10 m. This is far more precise than any known customer demands for this group of products today. The apparatus measures straightness deviations in all directions as well as spiral twist of the bar/tube.

Technical specification