Lunyee CNC 1325 Pro

About the Machine

The CNC 1325 Pro is Lunyee's large-format industrial router, with a 1300 x 2500 x 200 mm working area, a 2.2, 3, or 5.5kW spindle (0 to 24,000 RPM), and 86-frame stepper motors. It drives the X and Y axes on rail and rack, and the Z axis on rail and ball screw.

Cut Settings on this Machine

Every cut starts with one formula: Feed Rate = Spindle Speed (RPM) x Chip Load x Number of Cutting Edges (flutes). Chip load is the thickness of material each cutting edge removes in one revolution of the bit. This number comes from the manufacturer of the bit, which publishes a chip-load chart for each bit diameter and material. Look up your exact bit and material, start from the middle of the published range, and you have the third number in the formula. The chart below shows the recommended spindle speed for each material and bit type.

The CNC 1325 Pro's 2.2 to 5.5kW spindle spins up to 24,000 RPM, above most of the chip-load chart's range, and its rack-and-rail X/Y drive with a ball-screw Z axis is built for a heavy industrial gantry, not a hobby desktop. A machine this rigid and this powerful can cut as deep as the bit is wide in a single pass: that takes real spindle torque, a drive train and clamps that hold firm, a gantry that will not flex, and enough mass to soak up vibration, and this one has all four. Even so, push a pass past what the flute geometry and material can clear and it will deflect and chatter, leaving scalloped edges, or rub instead of cutting and burn the material, so build up from a conservative first pass. The fastest way to dial in a cut is to see what has already worked for other people.

Worked example for feed rate: 1/8in (3.175mm) two-flute solid carbide end mill in hard wood. The chart says 16,000 RPM, well within this spindle's range, so run 16,000. With the bit maker's 0.025mm per tooth (0.0010 in): 16,000 x 0.025 x 2 = 800 mm/min (31 in/min) feed. For depth per pass, start shallow and check Community Cut Settings in Easel for what works on this machine. If the cut sounds strained, reduce the depth, not the feed. Slowing the feed below the chip load makes the bit rub instead of cut.

Community Cut Settings shows the spindle speed, feed rate, and depth per pass other makers actually run for your machine, material, and bit.