54 Bullnose centre head and taper shank The bullnose centre head is of wear- resistant, through-hardened alloy tool steel. In contrast to usual case-hardening, this allows the head of the centre to be reground several times without any loss of hardness. The taper shank is case hardened for protection from damage. Tolerance of taper shank The Morse taper is ground according to DIN 228 AT4 (gauge accuracy). This fine tolerance guarantees a close fit of the high performance bullnose centre in the tailstock and the full utilisation of the concentricity accuracy. Load values The load values given in our tables are calculated with the world wide acknowledged software KISSsoft. When used in keeping with currently valid standards DIN and ISO, this software guarantees a safe and reliable load calculation. Precision bearings The bearings are selected according to the size of the Morse taper.The bearing seats of the head and the taper shank are matched to the bearings and ground to precise tolerances. Bearings and their seats are selected to fit. Result: high stability, minimum runout and long life. Maintenance The bearings are maintenance free due to permanent lubrication. Repair service Our repair service is at your disposal. We judge the tool’s condition and inform you about the extent of necessary refurbishment. BRUCKNER WORKS STANDARD Our high performance bullnose live centres – standard as well as special designs – are produced and tested according to our own stringent works standard. Materials, production and testing are subject to strict quality guidelines guaranteeing function and performance of our tools. Test report for concentricity accuracy Every single BRUCKNER high performance bullnose live centre is tested for its runout under axial load. The test result is then stamped into the centre and is guaranteed by the test report and quality guidelines guaranteeing function. Example: table „maximum runout“ for types ZA, ZAG High Performance Bullnose Live Centres BRUCKNER WORKS STANDARD www.KISSsoft.AG RUCKNER® Test Report Concentricity accuracy mm Our high performance live centres, tailstock sleeves and bullnose live centres are tested for their runout under axial load. The test result is stamped into the tool. Every single product has the BRUCKNER test mark and the BRUCKNER logo as guarantee for quality and accuracy. This product is maintenance-free due to high grade permanent lubrification. Tel. +49 (0) 7151 9671-0 Fax +49 (0) 7151 9671-23 info@karlbruckner.de www.karlbruckner.de Bruckwiesenstraße 13 71384 Weinstadt GERMANY Karl Bruckner GmbH Präzisionswerkzeugfabrik Einleger_ 162x47dt + engl_mit 05.12.14 16:18 Seite 2 Type ZA Type ZAG Morse taper Runout max. Fax daN Type ZA Type ZAG 1920-1922 2120-2122 2 0.007 0.003 160 1930 2130 3 0.007 0.003 160 1831-1933 2031-2133 3 0.007 0.003 210 1841-1941 2041-2141 4 0.007 0.003 210 1942-1947 2142-2147 4 0.007 0.003 450 1952 2152 5 0.007 0.003 450 1953 2153 5 0.007 0.003 600 1954-1959 2154-2159 5 0.007 0.003 600 1964-1970 2164-2170 6 0.007 0.003 600 1983-1985 2183-2185 6 0.007 0.003 600
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