Sainsmart Genmitsu 3020-PRO MAX V2

About the Machine

The Genmitsu 3020-PRO MAX V2 has a 300 x 205 x 78 mm working area, a 300W spindle (52mm diameter), and NEMA17 stepper motors (48mm) on a dual steel X-axis guide rail.

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 3020-PRO MAX V2's 300W spindle doesn't have a published max RPM, so check the spindle's plate before assuming it matches the chart. 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. An enclosed steel X-axis guide rail gives this machine more stiffness than Sainsmart's smaller kits, but it still isn't rigid enough for full bit-width depths, 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; Sainsmart does not publish a max spindle RPM for this model, so check the spindle's plate for its actual ceiling and use the lower of the two. 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, adjusted down if your spindle's plate shows less. 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.