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News & Press


Comprehensive display of high precision metal cutting and grinding technology from Hardinge Inc. at AMB

AMB 2018:  Stuttgart, Halle 5, Stand B80. The latest Kellenberger 100 platform concept cylindrical grinding machine features alongside two Hardinge…
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UK machine debut and Okamoto introduction are highlights for Jones & Shipman at MACH

Stand 875 – Hall H20 The UK debut of an entirely new Kellenberger universal grinding machine concept and a first…
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Comprehensive grinding solutions on offer from Hardinge Grinding Group at Grindtec

Kellenberger, the Swiss manufacturer of high precision grinding machines, is representing the interests of the international Hardinge Grinding Group at…
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Kellenberger 1000 – Swissness par excellence

State of the art technology, a cool design and top ease of use. For 20 years now, the firm Kellenberger…
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Grinding cell is the ‘heartbeat’ of pump manufacturing

One of Western Europe’s largest jig grinding cells operating eleven Hauser ‘S’ series jig grinders has been described by its operator as ‘the heartbeat’ of its high precision manufacturing operations. Located in the Kegworth, Derbyshire manufacturing plant of Slack & Parr Limited, the cell is dedicated to the manufacture of key components used in a wide range of high precision gear metering pumps and hydraulic flow dividers. From its initial venture in 1917, Slack & Parr has progressed to become a market leader in high precision engineering. A high volume of its output from Kegworth are pumps used for polymer extrusion and metering, generally in the global man-made fibre industry. J&S - Slack & Parr PR8 Pumps manufactured by Slack & Parr have been responsible for several major innovations in man-made fibre spinning and the company acknowledges that its expertise in jig grinding key components within the pumps to fine micron tolerances has been instrumental in its global success. Continued investment in the jig grinding cell is essential to remain competitive in the major Asian export markets. The first Hauser jig grinder was installed in Kegworth in 1988, it being an X3 micro-processor controlled machine. It has since been followed by a further ten machines – all still in full operation. The most recent is a Hauser S35 4 axis CNC machine installed in 2012 – one of four similar machines in use at Slack & Parr along with older semi-automatic machines. The grinding workshop at Slack & Parr manufactures precision pump components such as gear casings and gears with tolerances as tight as 2 microns. Most components are manufactured from hardened tool steels as hard as 63 HRC. The gear pumps manufactured by Slack & Parr need to work continuously at temperatures as high as 500 degrees Celcius with only pumped product lubrication, giving discharge accuracy of <1% pulse-less flow and withstand differential pressures as high as 400 bar. In cycle grinding and upon completion, the parts are rigorously inspected using customised air gauging equipment. A typical gear casing could feature up to 11 different diameter precision ground bores to accommodate the gears, dowels and the main driving spindle. Slack & Parr PR 3 As many customers require bespoke designs Slack & Parr estimate they manufacture up to 2500 different pump models. Slack & Parr PR 2 The specification of the Hauser machines are all towards the top end with many options such as ISI/DIN programming using the custom created, Hauser Software Cycles that ensure the control perfectly covers all aspects of the jig grinding process. A wide range of grinding techniques are accommodated as standard – bore, contour, pocket and shoulder – with MSS utilised for grinding wheel calibration and dressing cycle assistance. The Hauser machines have excellent build quality based on a distortion free, thermally stable module with sliding or roller guide ways wherever possible, friction central axis guides, optimally positioned measuring and smooth stroke reversal. The S35-400 features an automatic tool change arbour- a 9000 to 70,000rpm electric motor, measuring probe and the HI-CUT system that permits use of grinding oil as the preferred lubricant. Finally, the experience of the operators:- In total across its shift profile the Slack & Parr grinding shop employs some 30 personnel. Three in particular have achieved outstanding service and loyalty. Operators, Suresh Patel, Ashley Beadling and John Meggison have between them over 70 years’ experience of working on Hauser machines in Kegworth and in recognition of this were presented with wrist watches and long service certificates by the Swiss manufacturer as a ‘thank you’ for their loyalty and skills development. Suresh was in fact the first Slack & Parr operator trained on the first Hauser X3 micro-processor controlled machine when it was installed in 1988 and is today passing on his knowledge to Slack & Parr’s apprentices. 2013 - J&S - Slack & Parr PR1 Slack & Parr, Operations Director Richard Wilson explains; “Fritz Ruprecht who heads up sales from the Hauser HQ in Biel/Bienne visits us at least once a year and had observed earlier that 2013 was the 25th anniversary of the first installation. On his last visit he requested to meet with the three longest serving operators and they were delighted to receive the watches and certificates. It was a nice gesture to reward those who have worked so diligently in the jig grinding shop which is a centrepiece of our manufacturing operations.” Hauser machines are sold and supported in the UK by Leicester based Jones & Shipman Hardinge Ltd and as its managing director Mike Duignan explains, the operations at Kegworth are a Hauser flagship installation. “We know from our extensive dealings with Slack & Parr that the machines are absolutely integral to the precision and longevity of their world renowned products. Machine number 11 is running quite comfortably alongside its 25 year old predecessor and these experienced operators are handing on their skills to the younger team members and apprentices in the organisation.” Hauser is a Kellenberger company within the Hardinge Grinding Group. For UK enquiries please contact Jones & Shipman Hardinge on +44 (0) 116 201 3000 or e-mail [email protected] ENDS