Feed pressure gauge

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Hydrodynamic HMBF

The Bartec multi tube barfeed is a reliable time saving unit that will contribute significantly to productivity as a valuable addition to your CNC or automatic lathe. The hydrodynamic system permits high bar rotation speed with very low noise levels.

All models are of a fabricated steel construction of maximum performance. A small variation in diameter between each guide tube means higher average speeds across the range. Bartec feeders are capable of performance levels far in excess of mechanical or pneumatic types. The maximum bar rpm that can be expected for any given bar however cannot be accurately predicted.

Operational considerations
Round bar will perform better than square, hexagon or profiles. Straightness of barstock is important.

Composition of material ie. steel will generally perform better than brass. Clearance between barfeed guide tube and material – the smaller the gap the higher the speed.

Bar preparation by chamfering to approx. 0.75D x 60 degrees. Lathe headstock filler tubes are to be used. One filler tube is required corresponding to the diameter of the barfeed guide tube.

Lathe design
Lathes with short headstocks perform better than longer ones where guarding and cabinets may prevent close coupling of the bar feeder to the machine.

Principles of operation
Bartec feeders operate on hydrodynamic principles. A rotating bar is supported on a cushion of oil. The bar material rotates inside a guide tube, where the space between is filled with oil supplied from a pump. As the bar revolves inside the guide tube, hydrodynamic forces cause the bar to move toward the centre of the tube – the faster the rotation, the greater the centralising force.

Hydrodynamic barfeed system
Disconnection and reconnection of the rear oil feed tube is accomplished without total hose withdrawal. No chance for unsightly or hazardous oil spills.

The forward bush plates are hardened for high wear resistance. The end of the bar trip is contained within this plate and moves on a linear bearing giving reliable signalling of bar end to the machine tool control. Guide tubes are on a common PCD for rapid changes.

High repeat ability for guide tube index is obtained by use of CNC machining in all vital parts.
An indexing ring is keyed allowing rapid changeover of guide tubes.
The main assembly housing the guide tube pack moves easily on the forward support arm. All electrics are housed within this arm and can be easily withdrawn as a cartridge.

Feed pressure and bar movement speed are controlled by a custom designed valve. Oil circulating within the guide tube is returned to the tank via a filter unit and suction element giving maximum protection to pump valves. The hydraulic pump and motor are enclosed within a sound inhibiting cover.

Disconnection and reconnection of the rear oil feed tube is accomplished without total hose withdrawal. No chance for unsightly or hazardous oil spills.

The forward bush plates are hardened for high wear resistance. The end of the bar trip is contained within this plate and moves on a linear bearing giving reliable signalling of bar end to the machine tool control. Guide tubes are on a common PCD for rapid changes.

High repeat ability for guide tube index is obtained by use of CNC machining in all vital parts.
An indexing ring is keyed allowing rapid changeover of guide tubes.
The main assembly housing the guide tube pack moves easily on the forward support arm. All electrics are housed within this arm and can be easily withdrawn as a cartridge.

Feed pressure and bar movement speed are controlled by a custom designed valve. Oil circulating within the guide tube is returned to the tank via a filter unit and suction element giving maximum protection to pump valves. The hydraulic pump and motor are enclosed within a sound inhibiting cover.

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