{"id":510,"date":"2026-05-25T06:36:43","date_gmt":"2026-05-25T06:36:43","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=510"},"modified":"2026-05-25T06:36:44","modified_gmt":"2026-05-25T06:36:44","slug":"ple-plf-precision-servo-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/it\/prodotto\/ple-plf-precision-servo-gearbox\/","title":{"rendered":"High-Precision Planetary Gearbox for Servo Motors \u2014 PLE\/PLF Series"},"content":{"rendered":"

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High-Precision Planetary Gearbox for Servo Control<\/h2>\n
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\"High-Precision
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\u22644′<\/div>\n
Backlash (arcmin)<\/div>\n<\/div>\n
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97%<\/div>\n
Efficienza<\/div>\n<\/div>\n
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3\u2013512<\/div>\n
Gear Ratio<\/div>\n<\/div>\n
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30,000h<\/div>\n
Durata di servizio<\/div>\n<\/div>\n<\/div>\n<\/div>\n

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IL PLE\/PLF series precision planetary gearbox<\/strong> is engineered for seamless servo motor integration in demanding motion-control environments. With ultra-low backlash as tight as \u22644 arcmin<\/strong> (PLE precision grade) and transmission efficiency reaching 97%<\/strong>, it delivers repeatable sub-millimeter positioning across a 30,000-hour maintenance-free service life \u2014 performance parameters that direct-drive systems or conventional helical reducers simply cannot match in a compact, flanged form factor.<\/p>\n

Available in gear ratios from 3:1 to 512:1<\/strong> and compatible with servo motors rated 50 W to 6,000 W<\/strong>, the series spans joint actuators for six-axis robots, CNC feed axes, semiconductor wafer-handling stages, and high-throughput medical assembly systems. Both PLE and PLF variants share identical mounting interfaces, allowing future precision upgrades without mechanical redesign.<\/p>\n

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\ud83c\udfaf Ultra-Low Backlash<\/div>\n
\u22644 arcmin enables sub-mm accuracy in multi-axis robotic linkages.<\/div>\n<\/div>\n
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\u26a1 High Efficiency<\/div>\n
Up to 97% full-load efficiency \u2014 no thermal derating on servo drives.<\/div>\n<\/div>\n
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\ud83d\udd27 Zero Maintenance<\/div>\n
Sealed lifetime lube \u2014 no oil changes over 30,000-hour life.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

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Technical Specifications \u2014 PLE vs PLF<\/h2>\n

Both series use identical external dimensions and mounting flanges. The difference lies in manufacturing precision: PLE targets ultra-precision servo robotics with tighter gear grinding tolerances, while PLF balances performance and cost for general-purpose servo automation.<\/p>\n

\"60PLE<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nUnit\u00e0<\/th>\nPLE Series
\nPrecision Grade<\/span><\/th>\n		PLF Series
\nStandard Grade<\/span><\/th>\n<\/tr>\n<\/thead>\n
Backlash \u2014 Precision Grade<\/td>\nminuto d'arco<\/td>\n\u2264 4<\/td>\n\u2264 6<\/td>\n<\/tr>\n
Backlash \u2014 Standard Grade<\/td>\nminuto d'arco<\/td>\n\u2264 8<\/td>\n\u2264 12<\/td>\n<\/tr>\n
Full-Load Efficiency<\/td>\n%<\/td>\n\u2265 97<\/td>\n\u2265 95<\/td>\n<\/tr>\n
Gear Ratio Range<\/td>\n\u2014<\/td>\n3 : 1 \u2014 512 : 1 (single & multi-stage)<\/td>\n<\/tr>\n
Compatible Motor Power<\/td>\nO<\/td>\n50 \u2014 6,000<\/td>\n<\/tr>\n
Max Input Speed (no-load)<\/td>\ngiri al minuto<\/td>\nUp to 14,000 (frame-dependent)<\/td>\n<\/tr>\n
Temperatura di esercizio<\/td>\n\u00b0C<\/td>\n\u221225 to +90<\/td>\n<\/tr>\n
Classe di protezione<\/td>\nPropriet\u00e0 intellettuale<\/td>\nIP54 (standard) \u00b7 IP65 available<\/td>\n<\/tr>\n
Rated Service Life<\/td>\nhrs<\/td>\n30,000<\/td>\n<\/tr>\n
Lubrificazione<\/td>\n\u2014<\/td>\nLifetime sealed \u2014 maintenance-free<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

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\u25b8 Quick Selection Tip: <\/span>
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\nChoose PLE<\/strong> when backlash below 4 arcmin is mission-critical (robotics, semiconductor, optical stages).
\nChoose PLF<\/strong> when cost-efficiency matters alongside consistent performance (printing, packaging, general automation).
\nBoth fit identical mounting holes \u2014 direct drop-in upgrade.
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Engineering Architecture & Precision Manufacturing<\/h2>\n

The PLE\/PLF gear train consists of a ground sun gear, three symmetrically arranged planet gears in a precision-machined carrier, and a hardened ring gear. Torque is distributed simultaneously across all three contact points \u2014 reducing per-tooth stress and eliminating the single-mesh backlash accumulation that plagues conventional spur or helical inline reducers.<\/p>\n

\"planetary<\/p>\n

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Manufacturing Process \u2014 5 Critical Stages<\/h3>\n
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  1. 1<\/span>\n
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    Gear Blank Forging & Heat Treatment<\/strong><\/p>\n

    Alloy steel blanks undergo carburizing and case hardening to achieve surface hardness HRC 58\u201362, providing the wear resistance required for 30,000-hour service under cyclic contact stress.<\/p>\n<\/div>\n<\/li>\n

  2. 2<\/span>\n
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    CNC Profile Grinding to ISO 4\u20135<\/strong><\/p>\n

    Sun and ring gear teeth are finish-ground on dedicated CNC gear grinders, achieving flank surface finish Ra \u22640.4 \u00b5m and tooth profile accuracy within \u00b12 \u00b5m \u2014 the foundation of the \u22644 arcmin backlash specification.<\/p>\n<\/div>\n<\/li>\n

  3. 3<\/span>\n
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    Planet Carrier 5-Axis Machining<\/strong><\/p>\n

    Planet carrier bores are machined in a single setup on 5-axis machining centres, maintaining \u00b10.005 mm symmetry between pin hole centres \u2014 critical for eliminating unequal load sharing across planet gears.<\/p>\n<\/div>\n<\/li>\n

  4. 4<\/span>\n
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    Bearing Preload Assembly & Sealing<\/strong><\/p>\n

    Output-shaft bearings are axially preloaded in controlled conditions to eliminate radial runout and preserve backlash throughout service life. High-consistency synthetic grease is filled and sealed for lifetime operation without re-lubrication.<\/p>\n<\/div>\n<\/li>\n

  5. 5<\/span>\n
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    100% Final Acceptance Testing<\/strong><\/p>\n

    Every unit is tested on calibrated backlash measurement benches, full-load efficiency dynamometers, and runout gauges before shipment. Non-conforming units are quarantined and root-cause analysed \u2014 not reworked back to stock.<\/p>\n<\/div>\n<\/li>\n<\/ol>\n<\/section>\n

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    Precision Motion Applications Across Industries<\/h2>\n

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    Industrial Robotics & Cobots<\/h3>\n

    Six-axis manipulators stack joint backlash serially: every arcminute at the shoulder translates to millimetres of end-effector drift at 1.5 m reach. The \u22644 arcmin PLE specification enables \u00b10.1 mm repeatability<\/strong> across the full workspace envelope \u2014 meeting ISO 9283 Class 3 positioning requirements without external encoders or error-compensation software overhead. Typical selection: 16:1\u201350:1 ratios, 400 W\u20132,000 W motors.<\/p>\n<\/div>\n

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    CNC Machining & Grinding Centres<\/h3>\n

    Feed-axis and rotary-table drives demand backlash below the part tolerance \u2014 typically \u22645 \u00b5m at the cutting point. The PLF\/PLE combination in A\/B-axis tables delivers consistent positioning within one encoder pulse, enabling Ti-6Al-4V and Inconel 718 parts to first-article tolerance without manual compensation. Typical selection: 10:1\u201332:1 ratios, 1,000 W\u20134,000 W motors. For enhanced cutting-force output consider pairing with our right-angle worm reducer<\/a> on the clamping axis.<\/p>\n<\/div>\n

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    Semiconductor Wafer Handling<\/h3>\n

    300 mm wafer-transfer robots operate in Class 1 cleanrooms where particle contamination from grease migration or worn teeth is unacceptable. Our sealed PLE series uses fully enclosed greasing with zero external vents, achieving particle Class M1 suitability. Hysteresis-free actuation eliminates wafer-slot mismatch defects. Typical selection: 25:1\u2013100:1 ratios, 100 W\u2013600 W motors.<\/p>\n<\/div>\n<\/div>\n

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    Application Quick Reference<\/h3>\n