Replacement Cylindrical Grinding Machine

Description

A high precision universal cylindrical grinding machine for internal and external grinding operations, with centre height of 125mm and 650mm distance between centres Lot 1: A high precision universal cylindrical grinding machine for internal and external grinding operations, with centre height of 125mm and 650mm distance between centres • The universal grinding machine must be capable of performing both external and internal grinding operations. The machine must have a distance between centres of at least 650mm, and must have a centre height of at least 125mm with capacity to take workpieces up to 130Kg. • The machine must be capable roundness accuracy with live spindle grinding of 0.0003mm, or better. • The machine must be capable of grinding straightness at 0.0025mm over 600mm or better. • The machine must be provided with an internal grinding spindle (or spindles) for bore diameter 6-80mm (minimum range) • All measuring scales and graduations must be metric units. Digital measuring scales must be included in addition to analogue scales. • Workpiece table must swivel, and must provide micrometer controlled fine taper adjustment. • The workhead must accommodate a No 3 Morse taper holder and be able to grind between fixed centres as well as rotating centres. A universal work head with 0-90 degree swivel adjustment, must provide infinitely variable speed control. • The wheelhead must swivel with adjustment range of 0 to 180 degrees and have an external grinding wheel of minimum of 300mm diameter, the external grinding wheel spindle motor power must be at least 7.5kW, with grinding spindle must have speed adjustment, of infinitely variable type over a minimum adjustment range of 50-100%. The wheelhead infeed must provide, in addition to powered feed, manual handwheel adjustment over the full range of stroke. • The wheelhead infeed must provide speed adjustment functionality; • Adjustable working infeed speed (minimum range 0.012-5mm/min) • Incremental infeed, adjustable increment, (minimum range 0.001-0.05mm) • Adjustable spark-out time (minimum range 0-5s) • Rapid approach • The longitudinal axis travel range is to overrun the maximum centre distance before motion is limited by end of travel stops. • The longitudinal axis feed speed is to be adjustable with minimum range of 50-4000mm/min. • The longitudinal axis travel dwell at stroke reversal is to be adjustable. • The machine must have electronic contact detection. • The machine must be supplied with a tail stock equipped with adjustable barrel travel, with fine adjustment for cylindricity correction and fine adjustment of centre pressure, and able to accommodate a No 3 Morse taper holder. • The machine is to be supplied with all necessary wheel guards and any other guards required as per Machinery Directive 2006/42/EC and Supply of Machinery (safety) Regulations 2008. • The machine must be provided with task lighting and for both internal and external grinding • The machine must be supplied with a coolant system for use with emulsion liquids. • The coolant system must be provided with a paper band filtering system on the return to the coolant tank, which will be suitable for work with composites in addition to routine engineering materials. • The machine must have through work-head coolant supply for internal grinding. • The machine must work on UK specification electrical power supplies, 3 phase 415V and/or 240V • The machine must be provided with task lighting and for both internal and external grinding • The machine must be compliant with applicable UK regulations and supplied with CE/UKCA DoC for regulatory compliance. • The machine must be supplied with test certificates of machine geometry and calibration certificate. • The machine must be supplied with documentation in English: • Electrical schematics of machine control. • Hydraulic schematics • Pneumatic schematics. • Coolant system schematics • The machine must be supplied with the following documentation in English: • Operators’ manual • User manual • Servicing and Maintenance manual • Operating tools specific to the machine must be provided, and include; • Extraction tool for wheel adaptor. • Wheel balancing arbour to fit wheel adaptors • Facility for wheel balancing and static balancing of grinding wheels up to 400mm dia is to be included. • Machine must be supplied with all necessary supporting systems as required for correct operation and functioning of the machine, hydraulic, pneumatic, electrical, machine cooling, coolant supply etc. • Workholding – a range of work mounting, holding and setting-up tooling to provide a flexible machining capability is required and typically include; • 3 jaw self-centring chuck for work up to 160mm (spiral chuck). • 4 jaw adjustable chuck for work up to 160mm • 120mm magnetic chuck • 200-250mm magnetic chuck • Face plate 200mm (approximate size) face plate with T grooves and slotted holes • Two point steady(ies) (5mm upwards) • A comprehensive set of Internal grinding quills are to be included to provide flexibility in machining a range of component internal geometries with varied aspect ratios. And shall include an internal grinding collet chuck for small diameter wheels (complete with 3mm and 6mm collet and face grinding quill. • Wheel dressing, the range of component geometries and materials will be varied, to provide flexibility in wheel dressing and in process re-dressing a range of dressing options should be provided, typically include; • Tailstock mounted wheel dressing attachment. (With dressing diamond to suit). • Hinged dressing attachment (table mounted). • Radius dressing attachment for external/ internal rads. • A dressing attachment for CBN (and diamond) wheels. • A single point (chisel) dressing diamond. (For large concave rads) • A needle file point dressing diamond (18-20mm) (for concave dressing). • Wheel balancing, the machine is to provide dynamic balancing capabilities for in-situ mounted grinding wheels.