Grinding focus

The latest grinding technology available from its principals, Taiwan-based Perfect, and Italy-based Robbi and Delta will be displayed on the RK International stand.

The latest grinding technology available from its principals, Taiwan-based Perfect, and Italy-based Robbi and Delta will be displayed on the RK International stand at this year's MACH.

The Perfect X36 high precision surface grinder will make its UK debut at the show having been launched in 2015. The machine is now the largest in the X-series range from Perfect and features a 300mm by 600mm table size with maximum distance between the table and spindle centreline of 600mm.

The spindle is a 7.5hp (10hp option) capable of grinding wheel speeds up to 1,750rpm with maximum wheel size being 355mm x 50mm x 127mm. It makes use of linear slideways for the cross and vertical slideways, although a box slideway is optional on the vertical axis; for the X-axis a box slideway is standard.

Like its stablemate the X25, the X36 benefits from multiple grinding cycle routines including surface, criss-cross, plunge, and pitch grinding routines. In addition to the PLC control system on the machine can be manually controlled using a joystick when required, but these movements are overseen by foolproof PLC controlled safeguards.

The ease of operation is matched by the build quality and specification of the X36. As standard the machine is equipped with a 7.5hp CP4 high precision spindle, with pre-stressed adjustment, capable of accepting wheels up to 355mm diameter.

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On display from Robbi is the Omicron E T6-600 universal grinder with a 630mm distance between centres. This semi-automatic, PLC-based machine allows economical grinding of batches as small as one-off.

Key features of the E T6-600 are its ability to grind components weighing up to 250kg (300kg optional), a maximum table swivel of +9°/-5°, workhead rotation of between 0 and 300rpm. For larger workpieces Robbi has three larger variants with 1,030mm, 1,530mm and 2,030mm between centre distances.

The wheelhead contains a hydrodynamic spindle, rotating on anti-friction metal bushes that help to enhance surface finish quality, and its position is controlled to within 0.001mm by use of the incremental motor’s encoder in a closed loop. For additional accuracy an incremental linear encoder can be specified. The machine uses the Siemens TP 700 touch screen control panel that facilitates easy programming of grinding cycles, including features such as programming up to eight diameters in one cycle. The operator interface is also intuitive, showing the position of the wheelhead and table onscreen. Also, along with an internal (electronic) spindle, the machine at MACH will be equipped with Renishaw and Marposs gauging.

“We have had great success with the Robbi T6 PLC control,” comments Dick Aldrich, sales director. “More and more installations feature this easy to use system which allows up to eight diameters to be ground in a single grinding cycle, and the control does really offer near CNC capability at a considerable price advantage.”

The Robbi E series sits second in the series of the Omicron range with machines up to 6,000mm between centres and capacities of over 4,000kg and centre heights of up to 500mm.

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The final machine on the RK International Machine Tool stand is the Delta Rotax 7, a high precision, fully automatic, rotary table, travelling column, horizontal spindle NC grinding machine. These machines are suitable for one-off through to volume production environments across a range of industry sectors such as toolmaking, automotive, bearing, and mouldmaking.

Accuracy of the machine is enhanced by use of pre-loaded hydrostatic bearings on all axes. The horizontal wheelhead and travelling column also eliminates the overhang error that is commonly found in quill-type wheelhead assemblies.

Machine control and user interface is through Delta’s Compact Plus NC control, which, using Delta’s experience in grinding technology has been developed to simplify the programming of the most complex of grinding operations. All functions are accessed from the colour LCD screen with customised membrane keypad, with every key associated to a machine function.

RK INTERNATIONAL www.rk-int.com
Hall 5, Stand 5790

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