Product Details Supplier Info More products

Curtis Machine Tools’ Vector range has a grinding length of 100mm maximum and an integrated three-axis loading system, making it suitable for high-volume cylindrical grinding.

The Vector Twin is the advanced machine in the range, having two work spindles and being mounted in an indexing drum – allowing loading and grinding operations to be carried out concurrently and giving cycle-time reductions of up to 50 per cent.

With the fixed grinding guard, the grinding area is sealed and all coolant and debris is contained.

The coolant is piped through the bottom of the guard and mist is removed by an integrated extractor for conventional grinding.

For high-speed grinding, a separate, higher-capacity unit is used.

The grinding wheel is mounted on cross slides, allowing grinding to take place by moving the wheel to the left and dressing by moving to the right.

A dressing unit is mounted behind the grinding wheel – either fixed, rotary disc or diamond roll.

The left hand wall of the fixed guard has a divider plate between the two work spindles.

These are mounted in a drum that can be rotated through 1800 to index the spindles between the grinding and loading positions.

The splash guard above the grinding wheel rotates round the wheel so that, when the wheel is retracted for loading, the splash guard covers the front of the wheel, stopping any coolant released by the wheel from being thrown past the divider plate as the workhead indexes.

Grinding takes place on the spindle within the ‘dirty area’, while loading takes place on the clean area.

Grinding and loading therefore take place at the same time.

The index time for the workhead drum is 1.2sec and cut to cut time is 2sec.

In addition, secondary operations can be carried out on the component in the loading position, such as: brush debur, post-process diameter gauging and pre-process length positioning.

Because the coolant and grinding debris are totally contained within the fixed grinding guard, the part pick/place locations can be close to the work spindle.

This makes for short robot movements and allows the machine to have a very small footprint – 1,200mm wide including the loading system and pallet storage for the components.

The fixed guard also makes all machines in the Vector range suitable for high-speed superabrasive grinding wheels, as the wheel and high-pressure coolant are fully enclosed.

The target for the Vector Twin is to reduce loading ‘dead’ times to a minimum.

The typical loading time for a machine with one work spindle is 5-10sec.

A conventionally loaded machine producing 500,000 parts/year could spend over 1,000 hours per year loading and unloading workpieces – a zero-value-added function.

The Vector Twin, with 1.2sec load time, would cut this by more than 80 per cent.

Curtis Machine Tools

View full profile