Pedrini M920GR Bridge saw for marble and granite

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.

Parameters	Unit	M920GR	M920GR-F	M920GR-D900	M920MA-D900
Machine width	mm	6000	6000	6000	6000
Max. liftable weight with all the vacuum cups activated	Kg	4000	4000	4500	4500
Cooling water requirement(1.5 bar min. pressure)	L/min	50	50	50	50
Machine length	mm	4900	4900	4900	4900
Vertical cutting spindles motor power	kw	18,3 / 4P	18,3 / 4P	22	30 / 4P
Rotating table dimensions (not included)	mnm	3450 x 1900	3450 x 1900	3450 x 1900	3450 x 1900
Horizontal stroke(X axis travel)	mm	3600	3600	3400	3400
Useful cutting length with 310 mm thick slab	mm	-	-	2900	2900
Disc diameter	mm	625	625	900	900
Max. workable thickness	mm	200	200	310	310
Head raising/lowering stroke(Z axis travel)	mm	420	420	420	420
Tools holder head inclination(A axis blade rotation)	°	0 ÷ 45		0 ÷ 45	0 ÷ 45
Machine height	mm	2800	2800	2800	2800
Installed electrical power	kw	22	21	25	34
Bridge transversal stroke(Y axis travel)	mm	3600	3600	3600	3600
Cutting speed - X axis	m/min	0 ÷ 16	0 ÷ 16	0 ÷ 16	0 ÷ 16