https://www.geyontech.com/tech-library/Recent content in Technical Library on GeyontechHugoenFri, 02 Oct 2026 00:00:00 +0800https://www.geyontech.com/tech-library/81/Fri, 02 Oct 2026 00:00:00 +0800https://www.geyontech.com/tech-library/81/How to Read a Gear Inspection Report: Three Deviation Types, Tolerance Sources and Three Overlooked Judging Details Core answer: A gear inspection report comes down to three groups of numbers — pitch deviation (fpt single pitch, Fp total cumulative pitch), profile deviation (Fα / ffα / fHα), and helix (lead) deviation (Fβ / ffβ / fHβ)https://www.geyontech.com/tech-library/80/Tue, 29 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/80/Soft or Hard Tooth Flank? The 350 HBW Dividing Line That Decides Gear Material, Heat Treatment and Machining Sequence Core answer: when selecting gear materials, first determine the tooth surface hardness, then look at the steel grade. In engineering practice, 350 HBW is taken as the dividing line between soft and hard tooth surfaces —https://www.geyontech.com/tech-library/77/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/77/Gears in high end equipment are rarely standard shelf items. Semiconductor tools, medical instruments, precision machine tools and automation cells call for gears that are fine module, odd tooth, or ehttps://www.geyontech.com/tech-library/75/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/75/An export order and a domestic order run on the same machines and the same process. The difference sits in how the order is discussed. An overseas buyer does not stop at the price list — he works throhttps://www.geyontech.com/tech-library/73/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/73/Compare hobbing, shaping, shaving and grinding by accuracy grade, allowance and process sequence, from GB 6~7 hobbing to DIN 3 form grinding.https://www.geyontech.com/tech-library/79/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/79/The same gear: a Chinese drawing specifies 20CrMnTi, a German customer’s drawing specifies 16MnCr5 or 20MnCr5, a Japanese drawing specifies SCM420, and an American drawing specifies 8620 — the meaninghttps://www.geyontech.com/tech-library/72/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/72/ISO 6336 contact and root bending formulas with GB/T 3480, DIN 3990 and AGMA 2001: 20CrMnTi at HRC 58~62 gives σHlim 1500 MPa and σFlim 500 MPa, and the worked 3 mm module example gives σH ≈ 720 MPa.https://www.geyontech.com/tech-library/69/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/69/DIN 3967 marks tooth thickness tolerance as number 21-30 plus letter a-h; the h zone gives the smallest backlash. Angular backlash θ′ ≈ 6875.5 × jt/d: 0.02 mm at d = 50 mm is about 2.8 arcmin.https://www.geyontech.com/tech-library/74/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/74/In August 2026, GEP Research published its global wind turbine gearbox industry report with a set of numbers worth pausing on: the worldwide market for wind turbine gearboxes passed USD 9.24 billion ihttps://www.geyontech.com/tech-library/78/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/78/A robot moves precisely because the reducer at each joint carries the load — and inside that reducer, the gears do the real biting, so they set the backlash, the accuracy and the service life. As humahttps://www.geyontech.com/tech-library/76/Tue, 01 Sep 2026 00:00:00 +0800https://www.geyontech.com/tech-library/76/Robot reducers have been one of the loudest topics in transmission for two years, but the way money is made has changed. Zhiyan Consulting (Eastmoney Caifuhao, 4 Aug 2026) puts China’s robot reducer mhttps://www.geyontech.com/tech-library/57/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/57/Gear grinding is the finishing process applied after heat treatment to correct hardening distortion and bring hardened tooth flanks to ISO 1328-1 Grade 5, with profile deviation fα ≤ 5 μm and surface roughness Ra 0.2–0.8 μm. Two routes dominate: generating grinding with a threaded (worm) wheel cuts continuously and suits modules 0.5–8 mm, cutting per-piece cost roughly 20%–30% below form grinding in batch production; form grinding with a dressed profile wheel cuts tooth by tooth and suits large modules (mn ≥ 6 mm), low tooth counts, and special profiles. Choose based on three things: module, batch size, and profile complexity.https://www.geyontech.com/tech-library/52/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/52/Gears fail in three main modes: tooth pitting (contact fatigue), tooth-root bending fatigue fracture, and wear/scuffing. Heat treatment directly determines gear life by raising both surfachttps://www.geyontech.com/tech-library/59/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/59/‘Core answer: When a gear misses its drawing tolerance, the process choice is usually the cause.’https://www.geyontech.com/tech-library/63/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/63/‘Core answer: Module size is decided by strength calculation, not gut feel.’https://www.geyontech.com/tech-library/71/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/71/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 worm drives, and change the first fill at about 500 hours.https://www.geyontech.com/tech-library/61/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/61/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 surface.https://www.geyontech.com/tech-library/65/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/65/Pick the heat treatment route first, then the steel grade. Covers 40Cr and 42CrMo quench-and-tempered gears, carburized 20CrMnTi, and 38CrMoAl nitriding.https://www.geyontech.com/tech-library/60/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/60/ISO 12925-1 groups industrial gear oils into CKB, CKC, CKD, CKE and similar categories by load and duty. Viscosity selection comes down to two numbers: pitch line speed and contact stress.https://www.geyontech.com/tech-library/64/Sat, 01 Aug 2026 00:00:00 +0800https://www.geyontech.com/tech-library/64/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 controls.