GM-2

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GM-2 Test Cut

The large-frame GM-2 Gantry Mill is the heavy-duty brother to our GR-712 Gantry Router. Designed with heavier cuts in mind, the GM-2 incorporates heavier castings, dual X-axis ballscrews, more Z-axis travel, higher axis thrusts, a 30 hp inline spindle, and a 30+1 side-mount tool changer. Together, these features create a powerful workhorse for heavy-duty, large-part machining.

Gantry Series Model Overview

These machines easily handle large sheets, or can machine small parts by the thousand. See which Haas gantry machine is right for you!

5-AXIS + MORE POWER

GM-2-5AX

5-Axis CNC Gantry Mill with 145" x 87.5" x 39.3" travels

HSK 63F Taper
5 Axis
20k RPM
30+1 Tool Capacity

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Overview

An evolution of our gantry router platform, the GM-2 Gantry Mill is a large-frame milling machine capable of serious metal removal. Below is a comparison of features that differentiate the GM-2 (gantry mill) from the GR-712 (gantry router).

Gantry Mill Design Improvements:

Improved Gantry Design
Twin X-Axis Ballscrews
GM/UMC Spindle Head Assembly
Maximum Torque
Increased Axis Thrust
Higher Tool Changer Capacity
More Z-Axis Travel
Augers For Chip Removal
Free-Standing Control Pendant

Improved Gantry Design

To allow the Gantry Mill to take much heavier cuts, we stiffened the X-axis considerably, and redesigned the columns of the gantry assembly to improve stability and rigidity. The forward-most X-axis linear guide trucks are now well in front of the bridge, moving the center of gravity back, so the X-axis trucks are more evenly loaded. Also, there are now four linear guide trucks per side, and each truck has a higher load rating than those on the gantry router series machines.

Twin X-Axis Ballscrews

To take full advantage of the improved column and bridge design, we improved the X-axis drive system by adding a second X-axis ballscrew/motor assembly. Driving the gantry synchronously from both sides, rather than through a single connection in the center, ensures the gantry remains stable and rigid while in motion, and prevents skewing.

The two X-axis motor assemblies also nearly double the machine’s X-axis thrust, providing more force for heavy cuts and faster material removal.

GM/UMC Spindle Head Assembly

The highlight of the GM-2 is its powerful 30 hp (22.4 kW) inline direct-drive spindle. This is the same high-performance spindle used in our VF, EC, and UMC Series mills – now available to tackle your biggest jobs on this large, open-frame machine.

The GM-2 comes standard with an 8100-rpm spindle that is outstanding for all-purpose machining work. For high-speed machining operations and high feedrates with small tools, optional 10,000-rpm and 15,000-rpm high-speed spindles are available. These spindles are capable of high rpm operation, without sacrificing low-speed torque or high-speed power.

The GM-2 also incorporates the robust spindle head assembly from our highly successful UMC-1000, which uses linear guide trucks with a much higher load rating for added rigidity, transforming our very successful large-frame gantry router into a high-performance gantry milling machine.

This change also means that high-productivity options like Through-Spindle Coolant and Through-Tool Air Blast are available on the GM-2.

Maximum Torque

The GM-2’s upgraded spindle/motor combination more than triples the available torque and doubles the power rating of the spindle, compared to our GR-712 gantry router.

You get 90 ft-lb (122 Nm) of torque at 2000 rpm, and a 30 hp (22.4 kW) vector drive system – exactly the same performance you get from our very popular VF and UMC Series models. Now, you don’t have to sacrifice high metal removal rates for a huge work envelope.

Axis Thrust

Increased spindle power and rigidity mean nothing if you can’t push the cutter through the material. So, we stiffened the GM-2’s gantry, column, bridge, and spindle head assemblies to handle the additional forces generated during heavy cuts, and then added a second X-axis ballscrew/motor assembly to increase the axis thrust.

The GM-2’s X-axis thrust increased 80% to 4500 lbf (20,017 N), and the Y-axis increased 60% to 1650 lbf (7340 N) – more than enough for heavy cuts and fast material removal.

Tool Changer Capacity

The GM-2 also features our 30+1 tool side-mount tool changer with high-speed, direct-positioning carousel. This tool changer more than triples the tool capacity compared to our GR series gantry routers, and has the added benefits of providing much faster tool changes, and tool storage outside of the machining envelope.

Z-Axis Travel

With the addition of the spindle head casting and spindle motor assembly from the UMC series models, we were able to easily increase the Z-axis travel over the gantry router models.

In fact, we effectively doubled the Z-axis travel from 11" (279 mm) to 22" (559 mm).

Additionally, we increased the spindle nose-to-table dimensions to allow more room for the typical workholding used in milling applications. The minimum nose-to-table dimension increased from 2.5" (63.5 mm) on the GR-712 to 4" (102 mm) on the GM-2. The maximum nose-to-table dimension increased from 13.5" (343 mm) on GR-712 to 26" (660 mm) on GM-2.

Augers For Chip Removal

More spindle power means you’ll be producing a lot more chips each hour.

The GM-2 comes standard with dual chip augers – one on each side of the table, along the X-axis. The machine also comes with removable splash guard panels, which help constrain most coolant splash to the table, and remove easily, so chips and coolant can be brushed into the auger troughs on either side of the table.

All GM series models also come equipped with travelling enclosures, with flexible chip guards. These overlapping clear plastic strips create a flexible “curtain” that constrains chips and coolant flying off the cutting tool to the area around the spindle within sheet metal enclosure.

Free-Standing Control Pendant

The GM-2’s free-standing control pendant on wheels allows the operator to move the control to any convenient position, rather than have it permanently attached to the electrical panel at the end of the machine, like the gantry router models.

The machine also uses more convenient contact safety sensors, so now you can step close to the machine without triggering a feed-hold condition. You actually have to make contact with the safety sensor to trigger a feed-hold. This allows the operator to safely work on the table away from the machining area, while the machine is operating.

Travels	S.A.E	METRIC
X Axis	145.00 in	3683 mm
Y Axis	87.50 in	2223 mm
Z Axis	22.00 in	559 mm
Spindle Nose to Table (~ max)	26.0 in	660 mm
Spindle Nose to Table (~ min)	4.0 in	102 mm

Spindle	S.A.E	METRIC
Max Rating	30.0 hp	22.4 kW
Max Speed	8100 rpm	8100 rpm
Max Torque	90.0 ft-lbf @ 2000 rpm	122.0 Nm @ 2000 rpm
Drive System	Inline Direct-Drive	Inline Direct-Drive
Taper	CT or BT 40	CT or BT 40
Bearing Lubrication	Air / Oil Injection	Air / Oil Injection
Cooling	Coolant Jacket	Coolant Jacket

Table	S.A.E	METRIC
Length	144.0 in	3658 mm
Width	72.0 in	1829 mm
Thickness	1.0 in	25 mm
Max Weight on Table (evenly distributed)	6000 lb	2722 kg
Between Columns	75.0 in	1905 mm

Feedrates	S.A.E	METRIC
Max Cutting	472 ipm	12.0 m/min
Rapids on X	472 ipm	12.0 m/min
Rapids on Y	1889 ipm	48.0 m/min
Rapids on Z	1181 ipm	30.0 m/min

Axis Motors	S.A.E	METRIC
Max Thrust X	4500 lbf	20017 N
Max Thrust Y	1650 lbf	7340 N
Max Thrust Z	2000 lbf	8896 N

Tool Changer	S.A.E	METRIC
Type	SMTC	SMTC
Capacity	30+1	30+1
Max Tool Diameter (full)	2.5 in	64 mm
Max Tool Diameter (adjacent empty)	3.5 in	89 mm
Max Tool Length (from gage line)	11 in	279 mm
Max Tool Weight	12.0 lb	5.4 kg

General	S.A.E	METRIC
Coolant Capacity	95 gal	360 L

Air Requirements	S.A.E	METRIC
Air Required†	4 scfm @ 100 psi	113 L/min @ 6.9 bar

Electrical Specification	S.A.E	METRIC
Spindle Speed	8100 rpm	8100 rpm
Drive System	Inline Direct-Drive	Inline Direct-Drive
Spindle Power	30.0 hp	22.4 kW
Input AC Voltage (3 Phase) - Low	220 VAC	220 VAC
Full Load Amps (3 Phase) - Low	70 A	70 A
Input AC Voltage (3 Phase) - High*	440 VAC	440 VAC
Full Load Amps (3 Phase) - High*	35 A	35 A

Dimensions - Shipping	S.A.E	METRIC
Domestic Pallet	226.0 in x 143.0 in x 109.0 in	574 cm x 363 cm x 277 cm
Export Crate	226.0 in x 153.0 in x 127.0 in	574 cm x 389 cm x 323 cm
Weight	20200 lb	9190.0 kg
Export Crate for Sheet Metal	89 in x 57 in x 50 in	226 cm x 145 cm x 126 cm
Weight for Sheet Metal Crate	1400 lb	1400 lb

GM-2

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