Gantry system for heavy loads: single- and double-beam gantry robots on long rails with synchronised dual drives

01

Size payload against axis speed and beam type

DS Technology lists its DTG single-beam three-axis gantry robots at 15, 40 and 150 kg maximum payload with X, Y and Z speeds of 90, 60 and 60 m/min, and its DHG double-beam robots at 15, 40 and 150 kg with 90, 90 and 60 m/min, 400 kg with 60, 60 and 36 m/min, and 1,000 and 2,500 kg with 42, 42 and 30 m/min. It states ±0.1 mm repeatability, a high-rigidity V-type guide rail with rack-and-pinion drive, automatic lubrication, Mitsubishi PLC, servo motors and HMI, and fully customisable X, Y and Z travel with optional Z extension or C-axis rotation. [1]

Editorial calculation: 90 m/min is 1.5 m/s and 42 m/min is 0.7 m/s, so moving from a 150 kg to a 2,500 kg double-beam model raises payload about 16.7 times while cutting X speed by more than half. Cross a 6 m long axis at those speeds and the move takes at least 4 s and about 8.6 s, before acceleration. [1]

Qingdao Jiujin lists a heavy load type gantry robot for loading blanks, unloading finished parts, pick and place, sorting, storage and packaging, alongside dual-Z-axis gantry robots and gantry robots serving one, two or more CNC machines. [2]

Give the supplier the heaviest part and gripper weight, X, Y and Z strokes, cycle time per move, the machines or stations served, floor space and height, and the positioning repeatability needed at the pick and place points.

02

Keep both sides of the gantry synchronised

Tallman Robotics describes a gantry as two parallel linear modules connected by a moving element, and gantry synchronisation as the coordination and control of two or more servo motors so that the moving element travels precisely together along both sides; it states that drive selection depends on payload, speed, accuracy and the environment. [3]

Tallman lists synchronisation control of dual-drive systems with Delta ASDA-A3 servo drives for this duty, and offers a CNC lathe gantry loader among its gantry products. [3] DS Technology's gantry robots use rack-and-pinion drives on V-type rails for their long axes. [1]

Editorial note: ask the supplier how the two X-axis drives are coupled (electronic gantry function, master-slave or mechanical shaft), what skew between the sides is allowed before the system stops, and how homing squares the beam after a stop.

03

DS Technology single- and double-beam gantry models from 15 to 2,500 kg

All models below are from one supplier's table.

04

Beam, X rails, dual servo drives, Y–Z carriage and gripper of a heavy gantry

05

Payload, X/Y/Z travels, accuracy and repeatability the gantry is ordered on

06

Send the payload, strokes and cycle requirements together

Paste it into your enquiry below or into an email to a maker, then replace every bracket.

Payload: [part; gripper]
Strokes: [X; Y; Z; C option]
Cycle: [moves per hour; speed]
Stations: [machines served; conveyors]
Accuracy: [repeatability at pick and place]
Site: [floor space; height; supply]

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