Right-angle boring gauge head 50-150 mm

Testa di misura posizionata a 90°. Used when

the measuring space is limited and access to the bore is difficult with standard types.

Built with high-quality material and a very low coefficient of thermal expansion which, together with the special transmission system, allows very high measuring accuracy. In the case of thousandth measurements, the influence of temperature—for example hand heat—is decisive and leads to errors; in the BORLETTI-SUBITO reamer, since the materials are temperature-stabilized, these errors are reduced by 1/10 compared with normal reamers and are therefore practically zero.

The absence of play in the transfer of the feeler movement to the indicating instrument, obtained by means of the circular segment, is decisive to ensure accuracy.

The instrument repeatability is 0.0005 mm. Linearity over the entire travel of the moving feeler is 0.002 mm max. The instrument’s mobile centring bracket has a spherical sector configuration and this facilitates insertion even if the instrument is not perfectly aligned with the bore.

The instruments with a measuring range from 4.5 mm to 20 mm have both fixed feelers and the measuring feeler with hard metal inserts. Upon request, centring brackets with hard metal contacts can also be supplied. They can be used in the inspection room, for measuring individual parts, for checking series of parts, and for measurements during machining on machine tools. To facilitate instrument set-up, it is recommended to mount the comparator on its support without performing the final locking, and to carry out this operation when registering the instrument; this can be done easily using a workpiece with a bore taken as the reference sample measure, or by using a suitable instrument (micrometer or other). Reamers are supplied in wooden cases without a comparator. For thousandth measurements, comparators A1, CM1 are recommended; for hundredth measurements, comparator SC001. Since it is a comparative instrument, it is necessary first to zero it using the special ATA support, zeroing rings, or by using reference sample parts.