Grinding update for precision and quality

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Jones & Shipman Hardinge Ltd

As well as rubber moulds in many formats, the Bodmin operation also manufactures plastic moulds for products such as tamper-proof tips; very fine- ground cones for producing needle shields and trim dies used for precision- cutting the finished seals after moulding. High-grade stainless steel is the first- choice workpiece material for both the surface finishes achievable, and also because of the arduous sterilising regime that involves submersing the moulds in 400°C saline solution.

Grinding high-grade stainless steel

And, as John Chaffe explains, Jones & Shipman has long been the preferred grinding machine supplier to West in Bodmin. “We have operated two older 1300’s for some years, but when it came time to upgrade, we were impressed with the Easy software J&S has developed for programming and operating its latest-generation machines. We first invested in a 524 surface grinder with the touchscreen and Easy software, and when we added another 524 along with an Ultramat Easy 650 cylindrical machine, they readily integrated with our manufacturing processes.”

Operator acceptance of the Easy software has been excellent, and while the many different programmes are accessed from a network, skilled and semi-skilled operators alike find the software used at the machine "easy" as its name suggests. The latest-generation Ultramat 650 specified by West features the optional B axis with its wheelhead swivel for grinding negative tapers. The B axis provides the ability to not only grind multiple diameters but to angle features on components in one process and to automatically externally and internally grind in one set-up. This not only improves the cycle time but also the important repeatability and concentricity of parts as the component does not have to be remounted when undertaking batch work.

Running micron accuracies

Another specified option is an ACL (acoustic listening device), which allows for very precise pick-up by the operator when the wheel touches on the part. It is very accurate and allows the operator to run the machines to micron accuracies. There is also a special adaptor to accommodate occasional polar grinding.

The Ultramat 650 design features a one piece "Tee Bed" design with a fully supported table combined with technical innovation and the ability to offer high geometric accuracy.

Gallery

The control panels have membrane-type touch keys and electronic handwheels, while the machine also has automatic dressing and grinding cycles, which means it can be quickly set, then left unmanned. As standard, it is equipped with Heidenhain "Absolute" Nano linear scales and Fanuc Digital AC servo-motors and control.

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