JUPITER - Centerless cylindrical grinding
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CENTERLESS CYLINDRICAL GRINDING

JUPITER series centerless grinding machines offer substantial production benefits: The patented CNC height adjustment of the support blade minimizes tooling times, automatic adjustment of the grinding gap geometry optimizes the grinding process and the inclined bed guarantees maximum dimensional precision. Depending on the application, corundum, CBN or diamond is used as an abrasive. JUNKER • JUPITER

GRINDING PROCESSES CENTERLESS GRINDING During centerless cylindrical grinding, the workpiece is not clamped but lies in the grinding gap between the grinding wheel, regulating wheel and support blade. The grinding pressure presses the workpiece against the regulating wheel, which brakes the workpiece to its own peripheral speed. For this to work, the friction at the regulating wheel must be greater than the friction at the grinding wheel. The friction is achieved by the rubber bond at the regulating wheel and by inclining the support blade and machine bed. THROUGHFEED GRINDING PLUNGE-CUT...

CONCEPTS TO SATISFY THE HIGHEST DEMANDS WORKPIECE SPECTRUM JUPITER‘s high output has produced outstanding success across every sector of industry and covering a wide array of different materials - from carbide and steel to ceramic and glass. Typical workpieces include: • Roller bearing components such as rollers, pins, cages or rings • Various shafts, such as gear, turbocharger or rotor shafts • Engine components such as camshaft tubes, valves or piston pins JUNKER • JUPITER There are three main aspects which influence workpiece concentricity during centerless grinding: The grinding gap...

HIGHLIGHTS AND SPECIAL SOLUTIONS HIGHLIGHTS • Rapid set-up due to patented CNC height adjustment of the support blade • Minimized undulations with grinding wheel balancing on two planes • Extremely low running noise due to grinding spindle with direct drive • Optimum grinding quality as a result of market-leading rigidity • Optimized grinding process due to automatic grinding gap geometry setting • Individual CNC dressing of grinding wheel and regulating wheel ONE PASS, MULTIPLE OPERATIONS Rough, intermediate and finish grinding in a single pass: Using the throughfeed grinding method, the...

EQUIPMENT AND OPTIONS SUPPORT BLADE The patented CNC height adjustment of the support blade has two decisive benefits. Firstly, it ensures a faster set-up as all three grinding gap components (grinding wheel, regulating wheel and support blade) can be controlled from the operator panel. Secondly, the support blade compensates for changes in diameter keeping the workpiece axis on the same level during the entire grinding process. This exerts a positive influence on workpiece quality during centerless grinding. 8° INCLINED BED The 8° inclined bed increases friction at the regulating wheel, as...

CONTROL SYSTEM The Erwin Junker Operator Panel was specifically developed to control grinding machines. All machine components are controlled using the operator panel – irrespective of the series and the used control system. The identical structure, intuitive menu guidance and visualization of the workpiece geometry make for extreme user convenience and flexibility in operation. Programming takes place directly through the operator panel or by use of an external program tool. All the data is saved, including third-party assemblies. If required, the JUNKER Servicing Department can also...

LOADING SYSTEMS JUNKER offers both internal and external loading systems for all its machine series, depending on customer and workpiece requirements. The loading systems can be combined with different infeed and discharge systems such as conveyor belts or custom tailored systems. MEASUREMENT SYSTEMS The measurement systems are individually adjusted to specific workpieces and customer specifications. The measurement processes performed entail evaluation of the measured values, using these results for dimensional correction in line with the prepared measurement strategy. ABRASIVE Depending...

FIELDS OF COMPETENCE TECHNOLOGY CENTERS The JUNKER Technology Centers in Nordrach, Germany and in Holice, Czech Republic offer a wide selection of grinding machines for demonstrations and customer-specific grinding tests. These facilities give potential buyers and customers the chance to be impressed by the technical and economic performance of JUNKER and ZEMA grinding machines and test them on their own workpieces. SERVICE The company group‘s growing sales and servicing network ensures satisfied customers worldwide. JUNKER Premium Service acts swiftly and with outstanding expertise...

TECHNICAL DATA Corundum grinding wheel (63 m/sec) CBN grinding wheel (120 m/sec) Workpiece diameter Workpiece length Spindle drive Regulating wheel dimensions Spindle drive regulating wheel Throughfeed grinding Plunge-cut grinding Inclined plunge-cut grinding Grinding between centers Rough, intermediate and finish grinding W x D x H mm (without peripherals) Weight JUNKER • JUPI

EUROPE Erwin Junker Maschinenfabrik GmbH Junkerstraße 2 77787 Nordrach Germany Erwin Junker Grinding Technology a.s. Plant Holice Pardubická 332 534 13 Holice Czech Republic Erwin Junker Grinding Technology a.s. Russia Branch Office Prospekt Tolbukhina 17/65 150000 Yaroslavl Russian Federation Erwin Junker de Mexico, S. de R.L. de C.V. Blvd. Bernardo Quintana #7001 Torre 2, #1203 Centro Sur Querétaro Qro., C.P. 76079 Mexico Erwin Junker Máquinas Ltda. Centro Administrativo Rio Negro Edifício Jaçari - Bloco A 13° andar cj. 132/133 Alameda Rio Negro 585 CEP 06454-000 Alphaville – Barueri, São...