Most of the Pneumatic Mining Tool parts are manufactured in Alloy Steel (SAE 4140, SAE 8620, EN19, EN24 etc). Many of these parts are hardened finish having precise accuracy and complex operations as well. We have been producing straight & spiral splines parts on VMC machines without using any broach. The sizes of the splines are perfectly maintained. For achieving perpendicularity, concentricity & parallelism more precisely and repeatedly we use to finish the hard parts up to 62 HRC hardness by turning on CNC turning centre. This helps us to eliminate grinding operations and to rely on the repeatability of precise dimensions. While in process all the parts are checked and record is maintained for future references. The tolerances of these parts are between 0.010 to 0.050 mm and some dimensions are within 0.005 to 0.008 mm. These parts are supplied to OEM company as per their drawings.