Carbide 3D Shapeoko 4

About the Machine

The Shapeoko 4 comes in three sizes: Standard (17.5 x 17.5 x 4 in), XL (33 x 17.5 x 4 in), and XXL (33 x 33 x 4 in). It uses a 65mm trim router as a spindle (not included, upgradeable to the Carbide VFD Spindle), Heavy-Duty V-wheels on 15mm belts for X/Y, and a leadscrew-driven Z-Plus Z-axis with heavy-duty linear bearings. Takes about 2-3 hours to assemble.

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 Shapeoko 4 ships without a spindle: you supply a 65mm trim router (the Carbide Compact Router or a compatible router like the Makita RT0701C), or upgrade to the Carbide VFD Spindle, so your actual RPM depends on what you install. Heavy-Duty V-wheels on 15mm belts and a leadscrew Z-Plus Z-axis give it a solid base for a desktop machine, but it's not a rigid industrial frame, especially on the larger XL and XXL sizes. 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. The Shapeoko 4 falls short of that bar, and the fix is simple: take shallower passes. 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: since this machine ships without a spindle, check your router's plate or speed dial for its actual RPM and use that number instead. 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.