Gantry machining centre

LMB Hard Rail Gantry Machining Centre

Suited to multi-species batch machining of complex parts — large and medium-sized castings and structural parts under heavy cutting in automobile, aerospace and electric power work — as well as box parts, valve parts and structural steel fabrications.

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LMB Hard Rail Gantry gantry machining centre

Features

The base rails have a large span and high rigidity, giving the machine excellent support.
For X-axis travels of 6 metres and below the base is a one-piece bed casting, so bed accuracy is not destabilised by splicing errors.
The internal bar-crossing structure spreads load more evenly, making the beam more rigid and improving bearing capacity.
A screw support device is standard on the X-axis, reducing vibration from long-stroke screw overhang and protecting full-length working accuracy (5 metres and above series).
The LMB series uses a high rigidity square ram spindle box (LMB-13/18 series use a T-type square ram); the four hard rails carry the transverse spindle load, so the Z-axis can take heavy cuts through the full stroke.

Specification

Published catalogue figures. Options and non-standard travels are quoted separately.

LM / LMB belt-drive models — principal specifications
Item	Unit	LM/LMB-2013	LM/LMB-3013	LM/LMB-2218	LM/LMB-2718	LM/LMB-3218	LM/LMB-3223	LM/LMB-4223
Processing range
X axis travel	mm	2000	3000	2200	2700	3200	3200	4200
Y axis travel	mm	1500	1500	1950	1900	1900	2770	2770
Z axis travel	mm	800	800	800	800	800	1000 opt. 1200	1000 opt. 1200
Double column spacing (door width)	mm	1300	1300	1800	1800	1800	2300	2300
Spindle nose to worktable distance	mm	200-1000	200-1000	200-1000	200-1000	200-1000	300-1300	300-1300
Workbench
Workbench size (X direction)	mm	2200	3200	2000	2500	3000	3000	4000
Workbench size (Y direction)	mm	1100	1100	1500	1500	1500	2000	2000
Maximum load of workbench	t	5	6	6	8	10	15	18
Spindle
Drive method	—	Belt drive					Belt drive (direct drive)
Spindle taper	—	BT-50 Φ190 (short nose)
Spindle speed	r/min	6000	6000	6000	6000	6000	4000/6000	4000/6000
Max. output torque of the spindle	N·m	190/313	190/313	190/313	190/313	190/313	770/1089	770/1089
Spindle power	kW	15/18.5	15/18.5	15/18.5	15/18.5	15/18.5	22/26	22/26
Feed system
Rapid feed rate X/Y/Z	m/min	12/12/12	12/12/12	12/12/12	12/12/12	12/12/12	10/12/12	10/12/12
Cutting feed rate X/Y/Z	mm/min	1-8000	1-8000	1-8000	1-8000	1-8000	1-8000	1-8000
X/Y/Z motor power	kW	3/3/3	3/3/3	3/3/3	7/3/3	7/3/3	6/7/7	6/7/7
Precision
X axis positioning precision (full travel)	mm	0.015	0.020	0.015	0.015	0.025	0.025	0.025
Y axis positioning precision (full travel)	mm	0.012	0.015	0.012	0.015	0.015	0.020	0.020
Z axis positioning precision (full travel)	mm	0.001	0.010	0.001	0.010	0.010	0.015	0.015
X axis repeatability	mm	0.015	0.020	0.015	0.015	0.020	0.020	0.020
Y axis repeatability	mm	0.012	0.015	0.012	0.010	0.015	0.015	0.015
Z axis repeatability	mm	0.001	0.010	0.001	0.010	0.010	0.015	0.010
Other
Electricity demand	kVA	45	45	45	45	45	60	60
Air pressure specification	bar	6.5	6.5	6.5	6.5	6.5	6.5	6.5
Machine weight	t	16	18	19	20	21	30	35

LM / LMB direct-drive with gearbox models — principal specifications
Item	Unit	LM/LMB-6223	LM/LMB-8523	LM/LMB-4228	LM/LMB-6228	LM/LMB-8528	LM/LMB-6232	LM/LMB-8532	LM/LMB-6238	LM/LMB-8538
Processing range
X axis travel	mm	6200	8500	4200	6200	8500	6200	8500	6200	8500
Y axis travel	mm	2770	2770	3350	3350	3350	3850	3850	4500	4500
Z axis travel	mm	1000 opt. 1200	1000 opt. 1200	1000 opt. 1200	1000 opt. 1200	1000 opt. 1200	1300	1300	1300	1300
Double column spacing (door width)	mm	2300	2300	2800	2800	2800	3200	3200	3800	3800
Spindle nose to worktable distance	mm	300-1300	300-1300	300-1300	300-1300	300-1300	300-1600	300-1600	300-1600	300-1600
Workbench
Workbench size (X direction)	mm	6000	8000	4000	6000	8000	6000	8000	6000	8000
Workbench size (Y direction)	mm	2000	2000	2000	2000	2000	2500	2500	3000	3000
Maximum load of workbench	t	25	35	18	25	35	28	35	35	40
Spindle
Drive method	—	Direct drive + gear box
Spindle taper	—	BT-50 Φ190 (long nose)
Spindle speed	r/min	4000/6000	4000/6000	4000/6000	4000/6000	4000/6000	4000/6000	4000/6000	4000/6000	4000/6000
Max. output torque of the spindle	N·m	770/1089	770/1089	770/1089	770/1089	770/1089	770/1089	770/1089	770/1089	770/1089
Spindle power	kW	22/26	22/26	22/26	22/26	22/26	22/26	22/26	22/26	22/26
Feed system
Rapid feed rate X/Y/Z	m/min	10/12/12	10/12/12	10/12/12	10/12/12	10/12/12	10/12/12	10/12/12	10/12/12	10/12/12
Cutting feed rate X/Y/Z	mm/min	1-8000	1-8000	1-8000	1-8000	1-8000	1-8000	1-8000	1-8000	1-8000
X/Y/Z motor power	kW	6/7/7	9/7/7	6/7/7	6/7/7	9/7/7	6/7/7	9/7/7	6/7/7	9/7/7
Precision
X axis positioning precision (full travel)	mm	0.035	0.045	0.025	0.035	0.045	0.035	0.045	0.035	0.045
Y axis positioning precision (full travel)	mm	0.020	0.020	0.020	0.020	0.020	0.030	0.030	0.035	0.035
Z axis positioning precision (full travel)	mm	0.015	0.015	0.015	0.015	0.015	0.015	0.015	0.015	0.015
X axis repeatability	mm	0.030	0.035	0.020	0.030	0.035	0.030	0.035	0.030	0.035
Y axis repeatability	mm	0.015	0.015	0.015	0.015	0.015	0.025	0.025	0.030	0.030
Z axis repeatability	mm	0.010	0.010	0.010	0.010	0.010	0.010	0.010	0.010	0.010
Other
Electricity demand	kVA	60	60	60	60	60	60	60	60	60
Air pressure specification	bar	6.5	6.5	6.5	6.5	6.5	6.5	6.5	6.5	6.5
Machine weight	t	45	55	35	48	60	58	78	67	81

Equipment

Fanuc 0iMF control with 10.4-inch full keyboard screen, rigid tapping
Belt spindle 6000 rpm with oil temperature cooling and air blowing device
Manual tool release button on the spindle side
Hydraulic system with Z-axis double cylinder counterweight
Full cover sheet metal and automatic lubrication system
Cutting fluid system with tank and pump, transformer, working lamp
Levelling screws, ground anchor bolts and foundation gaskets
Fanuc 31iMB, SIEMENS 828D or SIEMENS 840D control in place of the standard Fanuc 0iMF
Belt drive spindle with gearbox 6000 rpm; spindle two-shift gearbox
Coolant through spindle, annular sprinkling or oil mist cutting device
Pedal type tool release switch of spindle
XYZ three-axis optical rulers
Column heightening 300 mm or 500 mm
Disc type 24T / 30T or chain type 32T / 40T / 60T tool magazine
Half cover sheet metal in place of full cover
Automatic workpiece and tool length measuring systems
Maintenance guardrail and stairs, electric box air conditioner, disc oil-water separator
CNC rotary table
Manual milling head, right-angle head, universal head or deep hole head

Applicable Industries

Automobile manufacturing
Hardware industry
Aerospace
Electric power industry

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Get A Tailored Quote For The LMB

Send The Largest Part Dimensions, The Material And The Tightest Tolerance. Our Engineers Confirm Whether The LMB Fits And Reply With A Detailed Quotation.

+86 15162661999
info@hankray.com
Room 1804-2, No. 33 Xinggui Street, Suzhou Industrial Park, Suzhou, Jiangsu, China

Model FAQs

Questions Engineers Ask About The LMB

Does the LMB favour aluminium speed or steel torque?

The LMB runs a 6000 / 6000 / 6000 / 6000 / 6000 / 4000/6000 / 4000/6000 r/min spindle speed. Aluminium work spends its time at the top of the speed band; steel roughing lives on torque lower down. Match the spindle to the material mix you actually cut week to week, and say so in the enquiry — the spindle line is confirmed in the contract.

What is built into the LMB that keeps it accurate?

Two build points matter most on this machine: the base rails have a large span and high rigidity, giving the machine excellent support; and for x-axis travels of 6 metres and below the base is a one-piece bed casting, so bed accuracy is not destabilised by splicing errors. Structure decides how a machine ages — the specification table tells you what it does new, the build tells you what it does in year five.

Which options should I consider when specifying the LMB?

Catalogued options for the LMB include: Fanuc 0iMF control with 10.4-inch full keyboard screen, rigid tapping; Belt spindle 6000 rpm with oil temperature cooling and air blowing device; Manual tool release button on the spindle side. Options are named line by line on the quotation with the base configuration, so what is written is what arrives — and if an option does not earn its money on your parts, we will say so.

How do I choose between the LMB and the DLM-3020?

Both sit in the gantry machining centre group, so the decision is capacity and duty, not kind: put your largest part dimensions, material and yearly quantity against each specification table and one of the two will run out of a figure first. Send the drawing and we will name which of the two fits — including the case where the smaller machine does the job.

What acceptance testing does the LMB go through?

Every LMB is laser-measured to ISO 230-2 over its travels, cuts a test piece that is measured rather than admired, and ships with a serial-numbered report carrying the measured values. If any line misses, the machine goes back into the shop until it passes — the report is a record, not a promise.

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