Granite CNC Bridge Cutting Machine in Italy

Cast iron bridge machine with tilting head for sawing marble and granite dimensioned elements, equipped with automatic PLC controlled cycle programming.
All M920GR motion motors are inverter controlled and equipped with encoder. The work parameters are programmed from the control panel and visualized on touch-screen display.
The turning table is motorized and, on demand, it can be tilting.
Pedrini bridge saw M920 cuts slabs and semi-finished products of marble, granite and other natural stones by means of a diamond disc.
M920 is highly competitive and efficient, its sturdy structure and user friendliness ensure perfection and linearity of the vertical and bevel cutting performance.
Each model can be fitted with several optional accessories which allow to tailor the machine according to each customer’s needs.
The machine is programmable through a big size touchscreen colour monitor. The rotating bench is available in different models.
M920 structure is mainly composed of a bridge and a mobile disc-holder trolley. Two bridge cross beams are fixed to concrete walls. The bridge has been manufactured in large thickness honeycomb structure and machined on all the reference surfaces by one sole positioning on tool machine.
All parts have undergone structural checks following the FEM (Finite Element Method) and their precision ensures perfect machine geometry and correct assembly on site. The machine surface is protected with two layers of paint applied after the sandblasting operation.
The exclusive “V” shaped double guides which linearly and constantly drive the disc-holder trolley along the bridge are machined onto the upper part of the bridge. The two sliding side cross beams are equipped with adjustment and foundations fixing systems. The disc-holder trolley houses the disc up and down movement and, upon request, the tilting movement to 45° or 90°.
X AXIS: CUTTING AND RETURN STROKES
The disc-holder trolley moves along the bridge through a combined gear motor/pinion/rack system powered by inverter and controlled by encoder which displays the position along the stroke. Protection carters efficiently cover the oil bath guides.
Y AXIS: LEFT AND RIGHT MOVEMENT
The transversal bridge movement is driven by a Cycle Drive gear motor controlled by inverter and encoder which shows the data on the display. The two side pinions are connected by a single shaft which ensures the positioning uniformity. The oil bath tracks are protected from water and dust.
Z AXIS: UP AND DOWN MOVEMENT
The up and down movement is fixed on the disc-holder trolley structure and slides along two prismatic guides driven by a gear motor/precision screw system and it is powered by an inverter and controlled by an encoder which shows the data on the display.
A AXIS: DISC TILTING MOVEMENT
When available, the disc tilting movement inclines the whole up and down axis up to 45° allowing the tilting cuts, also step cutting, and is driven by a self-braking gear motor with inverter and encoder.

Bridge saw for the production of tombstone art, buildings and paving stones. The cast iron sturdy and asymmetric structure allows to supervise the cutting area in a handy position outside the machine.
A PLC with large dimension touch-screen control panel manages the cutting parameters cycle. The turning table is motorized and, on demand, it can be tilting.
Numeric control bridge saw for cutting and shaping marble and granite
This aesthetically beautiful and avant-garde machine has been engineered for the construction of building elements and the manufacturing of furniture and Tombstone art elements.
The numeric control is handled by an industrial PC. The automatic cycles are easily programmed by touch screen from a colour monitor.
The tool-holder head can perform step cutting even in 0°/90° tilted positions. Perfect movements control allow for processing by spatula.
Owing to the adjustment system on all guides, the M940CN maintains the original precision unaltered in time.
The cast iron asymmetrical structure allows for easy supervision of the machine work field from the ground and from a safe outer position.
The peculiar triangular closed section and the internal ribbing provide the bridge with greater resistance when compared to traditional bridges of equal weight and length with “U” type open section.
The transversal movement mechanisms are housed in the very large shoulders section. The rack/pinion systems are equipped with devices for the continuous clearance recovery which guarantee precision in the movements.
The guides for bridge transversal stroke are effectively protected with special guards, against dust and water coming from any direction.
In the powerful trolley assembly, the slides, that are driven through precision screws, slide along prismatic guides with very large holding base.
Clearance adjustment easy to use devices allow for original precision holding in time.
Tool holder head inclination is adjustable from 0° to 90° with pneumatic locking system in any position.
Trolley, that is driven through a rack/pinion system, slides along two hardened, ground, chrome plated large diameter rods.
The rods are fixed at different levels onto bridge distant edges to allow for a very large trolley holding base, not reasonably possible with traditional guiding systems.
Owing to this guiding system, trolley reacts effectively not only to horizontal and vertical stress but also, specifically, to transversal stress that is particularly high in case of shaped tools and “spatula“ processing.

Numerical control bridge saw with 5 interpolated axes for cutting slabs of marble, granite and agglomerate up to 250 mm thick by means of a disc with max. diameter of 725mm. Accurate and sturdy, it is perfect for executing very quickly the cut of polygonal shapes even if complex. It assures high speed of working thanks to translations on ball bearing guides. It is controlled by a Fanuc numeric control and executes works by means of the interpolation of up to 4 axes at a time.

The ADVANCE version, considered as the evolution of the NEXT 1200, differs for the more advanced electronics, the big colour touch screen control panel and the StoneLab software. The machine can perform advanced cuts and complex shaping operations with disc.

Featuring the possibility to work both as a saw and a contouring machine, the EXCEL FC is made in the version with disc of 1000 mm in diameter, run of the Z axis of 1200mm and motor of 30 kw. The electrospindle that can use fingerbits, shaped tools and cutting discs represents the hearth of the machine. The possibility to rotate from 0 to +370 and to incline the head from 0 to 180 automatically, along with the high degree of accuracy of the movements and high speed, assure complex processing in an accurate and quick way.