In a three-roll machine two lower rolls drive the plate while the top roll presses from above: the lower it comes, the smaller the radius. The layout is simple, takes heavy thicknesses and handles varied parts — shells, arcs and cones. The edges are pre-bent as a separate operation: the plate is entered edge-first between the rolls, pre-bent, then turned around and the other end done the same way.

The catalog carries the Italian MG G-GE-GL series, 49 models. It starts with the MG G-GE-GL 1204 L: 1250 mm wide, plate up to 4 mm, pre-bending up to 2.5 mm, a 120 mm top roll and 3 kW. From there the range runs to heavy machines 3100 mm wide, for plate up to 195 mm, with a top roll up to 1100 mm and drives up to 380 kW — the class used for shipbuilding, tanks and large-diameter bodies.

If shells repeat and consistency matters, look at four-roll machines: they pre-bend both edges without re-setting the plate. For batches of thin-walled cylinders there are two-roll benders. How to compare plate rolls is covered on the plate rolls.

Three-roll plate rolls in the catalog

Model	Working width	Plate thickness	Pre-bending	Top roll	Power
MG G-GE-GL 1204 L	1250 mm	4 mm	2.5 mm	120 mm	3 kW
MG G-GE-GL 1504 L	1550 mm	5 mm	3 mm	130 mm	3 kW
MG G-GE-GL 1706 L	1750 mm	6 mm	4 mm	150 mm	3 kW
MG G-GE-GL 2004 L	2050 mm	4 mm	3 mm	140 mm	4 kW
MG G-GE-GL 2006 P	2050 mm	6 mm	4 mm	160 mm	4 kW
MG G-GE-GL 2008 B	2050 mm	8 mm	6 mm	190 mm	4 kW
MG G-GE-GL 2010 B	2050 mm	10 mm	8 mm	210 mm	5.5 kW
MG G-GE-GL 2014 R	2050 mm	14 mm	10 mm	230 mm	7.5 kW
MG G-GE-GL 2020 C	2050 mm	20 mm	14 mm	280 mm	10 kW
MG G-GE-GL 2025 D	2050 mm	25 mm	20 mm	300 mm	15 kW
MG G-GE-GL 2032 M	2050 mm	32 mm	25 mm	330 mm	20 kW
MG G-GE-GL 2040 E	2050 mm	40 mm	32 mm	380 mm	25 kW
MG G-GE-GL 2050 G	2050 mm	50 mm	40 mm	430 mm	40 kW
MG G-GE-GL 2060 H	2050 mm	60 mm	50 mm	500 mm	50 kW
MG G-GE-GL 2070 I	2050 mm	70 mm	55 mm	600 mm	75 kW
MG G-GE-GL 2090 Y	2050 mm	90 mm	65 mm	670 mm	100 kW
MG G-GE-GL 2506 P	2600 mm	6 mm	4 mm	190 mm	4 kW
MG G-GE-GL 2508 B	2600 mm	8 mm	6 mm	200 mm	4 kW
MG G-GE-GL 2510 B	2600 mm	10 mm	8 mm	210 mm	5.5 kW
MG G-GE-GL 2514 B	2600 mm	14 mm	10 mm	240 mm	7.5 kW
MG G-GE-GL 2518 C	2600 mm	18 mm	13 mm	270 mm	10 kW
MG G-GE-GL 2525 D	2600 mm	25 mm	20 mm	340 mm	15 kW
MG G-GE-GL 2530 M	2600 mm	30 mm	25 mm	370 mm	20 kW
MG G-GE-GL 2535 E	2600 mm	35 mm	30 mm	400 mm	30 kW
MG G-GE-GL 2540 F	2600 mm	40 mm	35 mm	420 mm	30 kW
MG G-GE-GL 2550 G	2600 mm	50 mm	40 mm	470 mm	40 kW
MG G-GE-GL 2560 H	2600 mm	60 mm	50 mm	500 mm	50 kW
MG G-GE-GL 2570 I	2600 mm	70 mm	55 mm	600 mm	75 kW
MG G-GE-GL 2590 Y	2600 mm	85 mm	65 mm	670 mm	100 kW
MG G-GE-GL 3006 A	3100 mm	6 mm	4 mm	200 mm	4 kW
MG G-GE-GL 3008 B	3100 mm	8 mm	6 mm	220 mm	5.5 kW
MG G-GE-GL 3010 R	3100 mm	10 mm	8 mm	240 mm	7.5 kW
MG G-GE-GL 3014 C	3100 mm	14 mm	10 mm	290 mm	10 kW
MG G-GE-GL 3016 C	3100 mm	16 mm	12 mm	300 mm	10 kW
MG G-GE-GL 3022 D	3100 mm	22 mm	16 mm	350 mm	15 kW
MG G-GE-GL 3025 M	3100 mm	25 mm	20 mm	370 mm	25 kW
MG G-GE-GL 3032 E	3100 mm	32 mm	25 mm	400 mm	30 kW
MG G-GE-GL 3036 F	3100 mm	36 mm	28 mm	430 mm	30 kW
MG G-GE-GL 3042 G	3100 mm	42 mm	32 mm	460 mm	40 kW
MG G-GE-GL 3048 G	3100 mm	48 mm	35 mm	480 mm	50 kW
MG G-GE-GL 3055 H	3100 mm	55 mm	40 mm	530 mm	60 kW
MG G-GE-GL 3065 I	3100 mm	65 mm	50 mm	610 mm	75 kW
MG G-GE-GL 3075 Y	3100 mm	75 mm	55 mm	680 mm	100 kW
MG G-GE-GL 3085 Y	3100 mm	85 mm	60 mm	730 mm	125 kW
MG G-GE-GL 3095 N	3100 mm	95 mm	70 mm	780 mm	125 kW
MG G-GE-GL 3120 T	3100 mm	120 mm	100 mm	820 mm	150 kW
MG G-GE-GL 3140 V	3100 mm	140 mm	120 mm	940 mm	220 kW
MG G-GE-GL 3160 Z	3100 mm	160 mm	140 mm	1000 mm	290 kW
MG G-GE-GL 3200 W	3100 mm	195 mm	160 mm	1100 mm	380 kW

Questions and answers

Three-roll or four-roll?

Three-roll machines are simpler and cheaper to maintain, take the greatest thicknesses and suit varied parts. Four-roll machines win on batches: the plate is clamped between the central rolls, so it does not have to be aligned every time, and both edges are pre-bent in one setup.

Why is pre-bending thinner than the maximum plate?

When an edge is pre-bent, the force is concentrated on a short section of plate instead of being spread along the arc, so the load on the rolls is higher. That is why the specifications give two figures: the maximum rolling thickness and a lower pre-bending thickness.

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