Sainsmart Genmitsu PROVerXL 4030

About the Machine

The Genmitsu PROVerXL 4030 has a 400 x 300 x 110 mm working area, a 300W spindle (24VDC, 12,000 RPM), and open-loop NEMA23 stepper motors (57mm) on a leadscrew drive.

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 PROVerXL 4030's 300W spindle tops out at 12,000 RPM, near the middle of the chart. It has more torque than a small brushed 775 motor, so favor the middle of its range for hard materials and push toward 12,000 for softer ones. Depth per pass is where the machine itself matters. 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. NEMA23 steppers and a C-Beam structure with dual Y-axis screw drive give this machine more stiffness than Sainsmart's smaller kits, but it's still on a leadscrew rather than a ball screw, so keep passes moderate. 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 12,000 RPM, so run 12,000. With the bit maker's 0.025mm per tooth (0.0010 in): 12,000 x 0.025 x 2 = 600 mm/min (24 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.