What we can help you buy on 1688
A machine that cuts aluminium and a machine that cuts wood can look identical in a photograph and differ by a factor of ten in stiffness. Aluminium does not forgive a flexible frame: the cutter deflects, the chip reloads, and the end mill snaps.
So this page is about three things — frame, spindle, drive — and how to tell which side of the line a machine falls on before you pay for it.
Request a quote for cnc routers that cut aluminium
An extruded-aluminium gantry on a 3018-class machine flexes visibly under a 3mm cutter in 6061. A steel-welded or thick-plate frame does not. Ask for the gantry material, its section, and the unsupported span — and treat "industrial grade" with no numbers as a decoration.
A T8 leadscrew has backlash you will feel as a ridge on every direction change. Ground ballscrews with angular-contact bearings do not. Which one, what diameter, what pitch, and whether the ends are fixed or floating — all of it is specifiable and rarely stated.
A 500W trim-router-style spindle will not hold torque at the low RPM aluminium wants. A 2.2kW water-cooled spindle with a VFD will. But the useful figure is torque at the RPM you will actually run, not the peak watt number on the box.
A machine sold domestically in China ships with a Chinese plug and, frequently, no CE or FCC file. Selling or operating it in the EU or US brings the machinery and equipment-authorisation rules into play, and they are the buyer's problem, not the seller's.
Most desktop machines arrive with no enclosure, no interlock and an e-stop wired only to the controller rather than to the spindle. If the machine goes into a workplace rather than a garage, that gap is what an inspector looks at first.
We can run your material on the machine before it ships — your alloy, a stated cutter, recorded feed and speed, and the finished part measured. That is the only evidence that settles this question, and it is cheap compared with a machine that cannot do the job.