Mysweety CNC 4540

About the Machine

The Mysweety CNC 4540 is a desktop router with a 500W spindle running 0-11,000 RPM, a NEMA17 stepper motor (42 x 48mm), and GRBL control with an included touchscreen offline controller. Mysweety's own listing gives two slightly different working-area figures for this machine (see warnings); the Specifications table's 450 x 400 x 90mm (17.72 x 15.75 x 3.54 in) figure was used here.

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 4540's 500W spindle runs up to 11,000 RPM, below most of the chart. Mysweety does not state a drive system (ball screw, lead screw, or belt) for this machine, so treat it as a mid-weight desktop router. Depth per pass is where the machine's build sets the limit: a truly rigid machine with a powerful spindle can cut as deep as the bit is wide in a single pass, but 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. Without a published drive system to confirm that, start with shallow passes and work up. Push too deep and the bit deflects and chatters, leaving scalloped edges, or it rubs instead of cutting and burns the material. 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, but this spindle tops out at 11,000 RPM, so run 11,000. With the bit maker's 0.025mm per tooth (0.0010 in): 11,000 x 0.025 x 2 = 550 mm/min (22 in/min) feed. Note the machine's own stated max movement speed is 5000mm/min (197 in/min), well above that number, so the spindle and chip load are the limiting factor here, not the machine's travel speed. 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.