Alesametro testa angolo retto 280-510 mm

Measuring head positioned at 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 boring gauge, since the materials are temperature-stabilised, these errors are reduced by 1/10 compared with normal boring gauges 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 makes insertion easier 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. On 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, which can be done easily using a workpiece with a bore taken as the reference sample; or by using a suitable instrument (micrometer or other). The boring gauges are supplied in wooden cases without a comparator. For thousandth measurements, the A1, CM1 comparators are recommended; for hundredth measurements, the SC001 comparators are recommended. Since it is a comparative instrument, it is necessary first to zero it using the special ATA support, zeroing rings, or by means of sample workpieces.