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Flagship large-format CNC in three sizes, ball screws and linear rails on every axis
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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 5.1 Pro ships without a spindle: the 65mm mount fits the Carbide Compact Router or the Carbide VFD Spindle, so your actual RPM depends on what you install. Ball screws on every axis (16mm diameter) and HG-15 linear rails make this the most rigid machine in the Shapeoko lineup, closer to the truly rigid, powerful-spindle machines that can cut as deep as the bit is wide in a single pass, though that still depends on which spindle you run and how well your clamps hold the material. Even on a build this solid, push too deep before you know your setup and the bit deflects and chatters, leaving scalloped edges, or it rubs instead of cutting and burns the material, so start conservative and work up. 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 spindle'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.
The Shapeoko 5.1 Pro runs Carbide Motion control software. The manufacturer's page does not use the word GRBL to describe it. Easel's real-time carving works with GRBL controllers over USB, so this machine's Easel Driver connection is not confirmed here. It is selectable in Easel's menu as 'Shapeoko 5 Pro 2x2,' 'Shapeoko 5 Pro 4x2,' or 'Shapeoko 5 Pro 4x4' depending on size, which sizes the canvas to that size's working area. A human should confirm the actual firmware and connection method before publish.
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