DgcityChinese space scientists have performed precision laser cutting in orbit for the first time, using a device mounted outside the Tiangong space station to slice through a piece of large-scale equipment with millimetre-scale accuracy. The test opens a practical path to repairing, recycling and eventually manufacturing hardware in space rather than hauling every part up from the ground.
The experiment ran on a platform attached to the station’s exterior, where a robotic arm held both the target material and the cutting head. Researchers on the ground directed a focused beam to slice and melt the material along programmed lines, then inspected the cut edges with cameras. The cuts held their shape despite the temperature swings, vacuum and vibration that make fine machining difficult off Earth.
Precision laser cutting is routine on factory floors, where a beam can be focused to a fraction of a millimetre and exhaust fumes vent away. In orbit, every assumption changes. There is no air to cool the surface, heat dissipates only through radiation and conduction, and debris from the cut does not simply fall to the floor. Any loose fragment becomes a potential hazard to the station itself, so the process has to contain the plume and molten droplets.
That is what makes the demonstration more than a technical curiosity. Long-duration stations and future lunar bases will accumulate worn panels, damaged trusses and obsolete instruments. Without the ability to cut and reshape metal on site, crews either discard the parts or wait months for replacements. A reliable laser tool would let them remove damaged sections, prepare clean joints for welding and salvage raw material for new components.
The test also builds a bridge to in-orbit manufacturing. Beams can cut, weld and additively deposit metal with the same basic hardware, and doing the work in vacuum avoids some of the contamination problems found on Earth. Chinese engineers have separately been developing robotic assembly and refuelling technologies for the station and for the country’s constellation projects.
The station’s exterior experiment racks have already hosted materials exposure studies, combustion tests and engine firings. Adding precision machining to that list turns Tiangong into a working orbital workshop rather than purely an observational platform.
Next steps are likely to involve thicker materials, longer cuts and attempts to weld pieces back together, along with tighter control of the debris plume. Success there would matter beyond the space station programme, feeding into plans for crewed lunar landings and the kind of sustained presence on the moon that depends on repairing equipment thousands of kilometres from the nearest machine shop.
