40 lines
1.2 KiB
JSON
40 lines
1.2 KiB
JSON
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{
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"title": "Endmill Deflection Calculator — data twin",
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"author": "Anna Brown",
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"site": "https://anna-brown.4ort.net/tool-deflection.html",
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"formula": {
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"deflection_in": "delta = F * L^3 / (3 * E * I)",
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"moment_of_inertia_round_shank_in4": "I = pi * d^4 / 64",
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"cantilever_stiffness_lbf_per_in": "k = 3 * E * I / L^3",
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"E_carbide_psi": 30000000,
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"E_hss_psi": 29500000,
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"E_cobalt_hss_psi": 22000000
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},
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"worked_example": {
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"material": "1018 steel slot, 0.75 in wide",
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"tool": "solid carbide endmill",
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"diameter_in": 0.375,
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"stickout_in": 2.0,
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"force_lbf": 180,
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"I_in4": 0.000969,
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"3EI_lbf_in2": 87200,
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"deflection_in": 0.0165,
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"thou": 16.5,
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"note": "at 1.25 in stickout same force: deflection 0.010 in; at 120 lbf: 0.0063 in"
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},
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"conversions": {
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"1_thou_in": 0.001,
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"in_to_mm": 25.4
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},
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"failure_modes": [
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"regenerative_chatter_is_dynamic_not_static",
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"force_spread_along_flute_not_point_load",
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"chuck_spindle_column_compliance_stacks_in_series",
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"necked_tools_have_nonuniform_I",
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"belt_drive_torsional_windup"
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],
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"grounding": {
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"machining": "https://4ort.xyz/entity/machining",
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"wikidata_Q192047": "subtractive manufacturing by material removal"
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}
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}
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