Chip load is the thickness of the chip taken by each cutting edge per spindle revolution. Feed rate, spindle speed and flute count determine it together. Changing one without considering the others changes how the tool cuts and how much heat leaves with the chip.
LMT Onsrud and ShopBot both describe this relationship directly. ShopBot also recommends using the cutter manufacturer's chip-load guidance as the starting point and then testing for the specific cutting situation.
A two-flute router bit is programmed at 18,000 RPM. The tooling data calls for a starting chip load of 0.009 inches per tooth. The calculated feed rate is 324 inches per minute.
The equation is simple. The cutting decision is not. A mathematically correct feed can still be wrong for a particular setup.
- TOOLUse the specific cutter maker's data. Geometry, diameter, coating and material matter.
- DEPTHCheck depth of cut. Tool manufacturers may require feed or chip-load reductions for deeper passes.
- MACHINERespect the machine. Spindle power, maximum feed, acceleration and rigidity can become the limiting factors.
- HOLDWatch the workholding. A feed the tool can handle may still move a poorly held part.
- HEATLook at chips and heat. Excess rubbing, burning, melting or poor chip evacuation are signals to stop and reassess.
Two tools with the same diameter and flute count can behave differently because of cutting geometry and manufacturer design. The same tool can also need different settings when depth of cut, material, spindle power or hold-down changes.
So this first Ryxen calculator keeps the recommendation where it belongs: with the tooling manufacturer. Ryxen handles the arithmetic cleanly and shows every number used.