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Drill bit life calculation

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Don Blanchet
Don Blanchet

slightly damaged 3/8 drill bit wobbles about .003 inches what is the estimated life before fracture?

Engineering
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DRILL BIT FATIGUE LIFE ESTIMATE FEA SIMULATION REV A 12/11/17 D. BLANCHET 3B ASSOCIATES 23 ROCKY HILL RD. BURLINGTON, MA 01803 781-272-7057 DWB3298@OUTLOOK.COM PREPARED FOR: I. TIMOSHENKO 0.375 DIA TOOL STEEL
SOLIDWORKS MODEL INCLUDING SMALL DEFECT
FEA REFINED MESH – 4 ADAPTIVE STEPS NEAR EXPECTED STRESS CONCENTRATIONS
APPLIED BOUNDARY CONDITIONS Fixed in chuck Side loading components From cutting Reaction forces
STATIC STRESS ANALYSIS – MAX BELOW FRACTURE MISALIGNMENT “WOBBLE” 0.0035 INCH
DRILL WOBBLE .0035 CAUSE OF ALTERNATING TENSILE AND COMPRESSIVE STRESSES – INDUCING FATIGUE FAILURE
FATIGUE LIFE S-N CURVE
FATIGUE LIFE ESTIMATE FROM FEA AT 800 RPM 1.6E04/800 = 20 MINUTES

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Drill bit life calculation