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Mid-size CNC with closed-loop steppers and a 710W spindle
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The NBS-6050 PRO is NymoLabs' mid-size router, with a 615 x 504 x 117 mm (24.21 x 19.84 x 4.61 in) working area, a 710W spindle (0-30,000 RPM) with a rotation speed display, NEMA24 closed-loop steppers, and ball screws with linear guides on every axis. It runs GRBL with a 2.8 inch TFT touchscreen offline controller.
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 NBS-6050 PRO's 710W spindle runs up to 30,000 RPM, above most of the chart, on NEMA24 closed-loop steppers with ball screws and linear guides on every axis. That's a rigid setup: it can take a confident pass on most woods, but back it off on denser material until you know how the bit and spindle handle the load together. 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, within this spindle's 0-30,000 RPM range, so run 16,000. 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 NymoLabs NBS-6050 PRO runs GRBL, so it connects directly to Easel. Install the free Easel Driver and plug in over USB, or connect driverless with Rapid Connect in a Chromium browser (Chrome, Edge, or Opera). Design in the browser, then the Carve button homes, zeroes, and runs the job with live progress. You can also export G-code to run from the machine's touchscreen controller via USB or SD card. Select NBS-6050 PRO in Easel's machine menu to size the canvas.
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