For example, Helical tool #07001, a flat-ended chamfer cutter with helical flutes, has a tip diameter of. On angled tools the cutter diameter changes along the LOC. This produces optimal parameters based on the machine’s top speed. In a case like this, it is recommended that the tool is run at the machine’s max speed (that the machinist is comfortable with) and that the appropriate chip load for the diameter is maintained. Since this speed is only attainable with high speed air spindles, the full SFM of 1,000 may not be achievable. 047” cutter in 6061 aluminum (SFM 1,000) would return a speed of ~81,000 RPM. ![]() With miniature tooling and/or certain materials the speed calculation sometimes yields an unrealistic spindle speed. As shown above, the cutter speed (RPM) is defined by the SFM (based on material) and the cutter diameter.
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