https://www.dgpinyi.com/tech-library/Recent content in Technical Library on PinyiGearHugoenTue, 27 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/rack-drive-cnc-laser-accuracy/Tue, 27 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/rack-drive-cnc-laser-accuracy/Why rack pitch error, joint alignment and mounting faces decide accuracy on long CNC and laser axes, and where ground, milled and hardened rack fit.https://www.dgpinyi.com/tech-library/sprocket-vs-timing-pulley-selection-accuracy/Tue, 27 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/sprocket-vs-timing-pulley-selection-accuracy/A technical guide to choosing between chain sprockets and timing belt pulleys, covering load capacity, backlash, pitch accuracy, and inspection methods.https://www.dgpinyi.com/tech-library/worm-gear-efficiency-material-selection/Fri, 23 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/worm-gear-efficiency-material-selection/How lead angle, friction, lubrication and material pairing shape worm gear efficiency, plus practical selection rules for bronze wheels and hardened steel sh.https://www.dgpinyi.com/tech-library/agma-din-iso-gear-accuracy-classes-guide/Tue, 20 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/agma-din-iso-gear-accuracy-classes-guide/A practical guide to AGMA, DIN and ISO gear accuracy classes, how they map to each other, and how to specify the right grade for your application.https://www.dgpinyi.com/tech-library/iso-1328-vs-din-3962-gear-accuracy/Fri, 16 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/iso-1328-vs-din-3962-gear-accuracy/How ISO 1328 and DIN 3962 define gear accuracy, where they differ, and how to read tolerance grades when specifying precision gears.https://www.dgpinyi.com/tech-library/gear-noise-vibration-control-ev-transmissions/Tue, 13 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/gear-noise-vibration-control-ev-transmissions/How micro-geometry, heat treatment and inspection discipline reduce gear noise and vibration in EV reducers and e-drive gearboxes.https://www.dgpinyi.com/tech-library/precision-gears-robot-joint-reducers-selection/Fri, 09 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/precision-gears-robot-joint-reducers-selection/How robot joint reducers use precision gears: accuracy grades, backlash control, materials, heat treatment and inspection methods for reliable motion.https://www.dgpinyi.com/tech-library/carburized-gear-heat-treatment-distortion-control/Wed, 07 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/carburized-gear-heat-treatment-distortion-control/How carburizing and quenching affect gear distortion, and which process controls keep case depth, hardness and accuracy predictable in production.https://www.dgpinyi.com/tech-library/gear-grinding-din-3-precision-classes-guide/Wed, 07 Oct 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/gear-grinding-din-3-precision-classes-guide/A technical guide to gear grinding, DIN/ISO/AGMA accuracy classes, and how to specify precision gears that match real application needs.https://www.dgpinyi.com/tech-library/81/Fri, 02 Oct 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/80/Tue, 29 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/79/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/69/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/75/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/77/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/74/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/73/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.com/tech-library/73/Compare hobbing, shaping, shaving and grinding by accuracy grade, allowance and process sequence, from GB 6~7 hobbing to DIN 4-5 form grinding.https://www.dgpinyi.com/tech-library/72/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/78/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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.dgpinyi.com/tech-library/76/Tue, 01 Sep 2026 00:00:00 +0800https://www.dgpinyi.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 m