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Radial Chip Thinning Compensation

Calculate the adjusted feed per tooth and feed rate when radial engagement is less than half the tool diameter.

Inputs

Tool Diameter (in)

Required

Desired Chip Thickness (in)

Required

Radial Engagement (in)

Required

Axial Engagement (in)

Baseline SFM (ft/min)

Required

Number of Flutes

Required

Results

Programmed Feed Per Tooth

in/tooth

Programmed Feed Rate

IPM

Adjusted RPM

RPM

Adjusted SFM

ft/min

Material Removal Rate

in³/min

Tool Engagement Angle

deg

SFM Adjustment50%

ConservativeAggressive

Formulas

fz = (CT × D) / (2 × √(D × RDOC − RDOC²))

IPM = fz × RPM × N

MRR = RDOC × ADOC × IPM

TEA = 2 × arccos(1 − 2×RDOC/D)

SFM_adj = SFM_base × (180° / TEA)^k

RPM = (12 × SFM_adj) / (π × D)

The SFM multiplier is an empirical approximation. k ranges from 0.35 (conservative) to 0.65 (aggressive), with 0.50 (typical) as the default. Validate against manufacturer recommendations and monitor chip color and tool wear.