Gear Heat Treatment: Carburizing vs Nitriding vs Induction
Gears fail in three main modes: tooth pitting (contact fatigue), tooth-root bending fatigue fracture, and wear/scuffing. Heat treatment …
Technical Library
Geyontech technical library — in-depth articles on gear design, gear hobbing, gear grinding, heat treatment (carburizing, nitriding)
Gear Hobbing vs Shaving vs Grinding: DIN Grades and Cost
'Core answer: When a gear misses its drawing tolerance, the process choice is usually the cause.'
Gear Module for 15 kW at 1450 rpm: ISO 6336 Calculation
'Core answer: Module size is decided by strength calculation, not gut feel.'
Gears Failing? 90% Is Wrong Lubrication — 4 Fixes That Work
Most gear failures are lubrication faults, not design faults. Use ISO VG 150~320 in enclosed boxes, VG 68~150 at high speed, VG 320~680 for …
How Deep Should the Hardened Case Be for Carburized Gears?
CHD is sized at 0.15-0.25 x normal module: 0.6-0.9 mm for modules up to 2.5 and 1.2-1.8 mm for modules of 5-10, with 20CrMnTi at 58-62 HRC …
How to Choose Gear Material: 20CrMnTi, 40Cr, 42CrMo, 17CrNiMo6
Pick the heat treatment route first, then the steel grade. Covers 40Cr and 42CrMo quench-and-tempered gears, carburized 20CrMnTi, and …
How to Choose Gear Oil: Film Thickness Ratio λ and ISO VG
ISO 12925-1 groups industrial gear oils into CKB, CKC, CKD, CKE and similar categories by load and duty. Viscosity selection comes down to …
How to Read a Gear Inspection Report: Fp, fpt, fα and fβ
ISO 1328-1 gear accuracy grades 0-12 explained, plus how to read Fp, fpt, fα and fβ on an inspection report and what each parameter …
ISO 1328-2:2020 Gear Accuracy Standards Update
ISO 1328-1:2013 and ISO 1328-2:2020 replace 1995/1997 editions, so export acceptance uses the new tolerances. DIN 3 ≈ ISO 3 ≈ AGMA 15; …
Profile Shift Coefficient: Strength vs Contact Ratio
The profile shift coefficient (x) is the core design parameter that simultaneously governs tooth root bending strength, flank contact …
Undercut and Contact Ratio in Involute Gears
For 20° involute spur gears, under 17 teeth causes undercut; keep contact ratio above 1.2, ideally 1.3-1.6, and use positive profile shift …
Why Gears Fail: Pitting, Scuffing, Wear and Tooth Breakage
'Core answer: Gear damage falls into four modes — pitting, scuffing, abrasive wear and tooth breakage.'
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