{"id":538,"date":"2026-05-26T08:12:22","date_gmt":"2026-05-26T08:12:22","guid":{"rendered":"https:\/\/planetary-gearboxes.com\/?post_type=product&p=538"},"modified":"2026-05-26T08:12:22","modified_gmt":"2026-05-26T08:12:22","slug":"bab-series-high-precision-planetary-gearbox","status":"publish","type":"product","link":"https:\/\/planetary-gearboxes.com\/th\/product\/bab-series-high-precision-planetary-gearbox\/","title":{"rendered":"\u0e0a\u0e38\u0e14\u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e17\u0e14\u0e23\u0e2d\u0e1a\u0e41\u0e1a\u0e1a\u0e40\u0e1f\u0e37\u0e2d\u0e07\u0e14\u0e32\u0e27\u0e40\u0e04\u0e23\u0e32\u0e30\u0e2b\u0e4c\u0e04\u0e27\u0e32\u0e21\u0e41\u0e21\u0e48\u0e19\u0e22\u0e33\u0e2a\u0e39\u0e07 \u0e23\u0e38\u0e48\u0e19 BAB \u2014 \u0e2b\u0e19\u0e49\u0e32\u0e41\u0e1b\u0e25\u0e19\u0e21\u0e32\u0e15\u0e23\u0e10\u0e32\u0e19 (EP-BAB042 \u0e16\u0e36\u0e07 EP-BAB220)"},"content":{"rendered":"

<\/main><\/p>\n
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EP-BAB Series \u2014 High-Precision Planetary Gearbox, Standard Flange for Servo Integration<\/h2>\n
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<\/p>\n

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\"EP-BAB<\/p>\n

\n
\n
\u22643′<\/div>\n
Backlash (arcmin)<\/div>\n<\/div>\n
\n
2,000<\/div>\n
Max Torque (N\u00b7m)<\/div>\n<\/div>\n
\n
8,000<\/div>\n
Max rpm<\/div>\n<\/div>\n
\n
\u226595%<\/div>\n
\u0e1b\u0e23\u0e30\u0e2a\u0e34\u0e17\u0e18\u0e34\u0e20\u0e32\u0e1e<\/div>\n<\/div>\n<\/div>\n

<\/p>\n


\n\u2190 Browse All Planetary Gearbox Series
\n<\/a><\/div>\n<\/div>\n

<\/p>\n

\n

\u0e40\u0e14\u0e2d\u0e30 EP-BAB series high-precision planetary gearbox<\/strong> is Korea Ever-Power’s most widely specified servo transmission product, combining a standard square-flange output with the precision gear engineering that industrial robots, CNC machining centres, automated assembly, and packaging lines demand. As a \u0e40\u0e01\u0e35\u0e22\u0e23\u0e4c\u0e17\u0e14\u0e23\u0e2d\u0e1a\u0e14\u0e32\u0e27\u0e40\u0e04\u0e23\u0e32\u0e30\u0e2b\u0e4c\u0e04\u0e27\u0e32\u0e21\u0e41\u0e21\u0e48\u0e19\u0e22\u0e33\u0e2a\u0e39\u0e07<\/a> built specifically for servo motor pairing, EP-BAB series delivers backlash of \u22643 arcmin single-stage<\/strong> across all seven frame sizes from EP-BAB042 through EP-BAB220, covering rated output torque from 14 N\u00b7m up to 2,000 N\u00b7m<\/strong>.<\/p>\n

What sets this high-precision planetary gearbox<\/strong> apart from standard industrial gear reducers is the manufacturing foundation: alloy steel gears with full-body hardening throughout<\/strong> \u2014 not surface-only case-hardening \u2014 maintain tooth geometry stability under cyclic contact stress so backlash does not creep upward over the service life. ANSYS finite element tooth-strength analysis, profile and lead corrections on every gear set, and an integrated one-piece planet carrier and output shaft eliminate tolerance stack-up at every stage of the assembly. The result is a high-precision planetary gearbox<\/strong> that remains within its stated specification across millions of servo reversals without recalibration \u2014 directly meeting the demands of Korea’s semiconductor, EV battery, and precision automation industries.<\/p>\n

\n
\n
\ud83c\udfaf \u22643 Arcmin P1 Grade<\/div>\n
Per-unit measured \u2014 guaranteed, not a population average.<\/div>\n<\/div>\n
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\ud83d\udd29 One-Piece Carrier + Shaft<\/div>\n
Planet carrier machined from single billet \u2014 no tolerance stack-up.<\/div>\n<\/div>\n
\n
\ud83c\udfcb\ufe0f 3\u00d7 Peak Torque<\/div>\n
Emergency stop capacity \u2014 3\u00d7 rated instantaneous.<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/section>\n

<\/p>\n

\n

EP-BAB042 to EP-BAB220 \u2014 Complete Technical Specifications<\/h2>\n

All all seven EP-BAB frames share identical precision standards, sealed lubrication, and output flange interface. The number suffix indicates housing diameter in millimetres. Select the smallest frame whose rated output torque exceeds your calculated load by at least 20%.<\/p>\n

\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Common Specifications \u2014 All EP-BAB Frames<\/th>\n<\/tr>\n<\/thead>\n
Backlash P1 (Precision Grade)<\/td>\nSingle-stage \u22643 arcmin \u00b7 Two-stage \u22645 arcmin<\/td>\n<\/tr>\n
Backlash P2 (Standard Grade)<\/td>\nSingle-stage \u22648 arcmin \u00b7 Two-stage \u226412 arcmin<\/td>\n<\/tr>\n
Single-Stage Gear Ratios<\/td>\n3, 4, 5, 6, 7, 8, 9, 10<\/td>\n<\/tr>\n
Two-Stage Gear Ratios<\/td>\n15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100<\/td>\n<\/tr>\n
Transmission Efficiency<\/td>\nSingle-stage \u226595% \u00b7 Two-stage \u226592%<\/td>\n<\/tr>\n
Noise Level (3,000 rpm, no-load, 1 m)<\/td>\n<65 dB(A)<\/td>\n<\/tr>\n
Peak Torque (Emergency Stop)<\/td>\n3\u00d7 Rated Output Torque (instantaneous)<\/td>\n<\/tr>\n
Max Acceleration Torque<\/td>\n60% of Rated Torque (T\u2082s = 0.6 \u00d7 T\u2082Nor)<\/td>\n<\/tr>\n
\u0e2d\u0e38\u0e13\u0e2b\u0e20\u0e39\u0e21\u0e34\u0e43\u0e19\u0e01\u0e32\u0e23\u0e17\u0e33\u0e07\u0e32\u0e19<\/td>\n0 \u00b0C to +40 \u00b0C<\/td>\n<\/tr>\n
Output Shaft Type<\/td>\nS1: Smooth shaft \u00b7 S2: With keyway (specify at order)<\/td>\n<\/tr>\n
Backlash Measurement Condition<\/td>\nOutput 100 RPM, force applied at output shaft centre<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Rated Output Torque (N\u00b7m) \u2014 Single-Stage (i = 3 to 10)<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
\u0e2d\u0e31\u0e15\u0e23\u0e32\u0e2a\u0e48\u0e27\u0e19<\/th>\nEP-BAB042<\/th>\nEP-BAB060<\/th>\nEP-BAB090<\/th>\nEP-BAB115<\/th>\nEP-BAB142<\/th>\nEP-BAB180<\/th>\nEP-BAB220<\/th>\n<\/tr>\n<\/thead>\n
i=3<\/td>\n20<\/td>\n\u2014<\/td>\n130<\/td>\n208<\/td>\n342<\/td>\n588<\/td>\n1,140<\/td>\n<\/tr>\n
i=4<\/td>\n19<\/td>\n50<\/td>\n140<\/td>\n\u2014<\/td>\n542<\/td>\n1,050<\/td>\n1,700<\/td>\n<\/tr>\n
i=5<\/td>\n20<\/td>\n55<\/td>\n150<\/td>\n\u2014<\/td>\n310<\/td>\n600<\/td>\n1,900<\/td>\n<\/tr>\n
i=6<\/td>\n\u2014<\/td>\n\u2014<\/td>\n140<\/td>\n\u2014<\/td>\n300<\/td>\n550<\/td>\n1,100<\/td>\n<\/tr>\n
i=7<\/td>\n\u2014<\/td>\n45<\/td>\n120<\/td>\n\u2014<\/td>\n260<\/td>\n500<\/td>\n1,000<\/td>\n<\/tr>\n
i=8<\/td>\n\u2014<\/td>\n\u2014<\/td>\n100<\/td>\n\u2014<\/td>\n230<\/td>\n450<\/td>\n900<\/td>\n<\/tr>\n
i=9<\/td>\n4<\/td>\n40<\/td>\n100<\/td>\n\u2014<\/td>\n230<\/td>\n450<\/td>\n900<\/td>\n<\/tr>\n
i=10<\/td>\n4<\/td>\n40<\/td>\n100<\/td>\n\u2014<\/td>\n230<\/td>\n450<\/td>\n900<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Rated Output Torque (N\u00b7m) \u2014 Two-Stage (i = 25 to 100)<\/h3>\n
\n\n\n\n\n\n\n\n\n\n\n\n
\u0e2d\u0e31\u0e15\u0e23\u0e32\u0e2a\u0e48\u0e27\u0e19<\/th>\nEP-BAB042<\/th>\nEP-BAB060<\/th>\nEP-BAB090<\/th>\nEP-BAB115<\/th>\nEP-BAB142<\/th>\nEP-BAB180<\/th>\nEP-BAB220<\/th>\n<\/tr>\n<\/thead>\n
i=25<\/td>\n15<\/td>\n60<\/td>\n160<\/td>\n160<\/td>\n330<\/td>\n650<\/td>\n2,000<\/td>\n<\/tr>\n
i=30<\/td>\n20<\/td>\n55<\/td>\n150<\/td>\n150<\/td>\n310<\/td>\n600<\/td>\n1,900<\/td>\n<\/tr>\n
i=35<\/td>\n19<\/td>\n50<\/td>\n140<\/td>\n140<\/td>\n300<\/td>\n550<\/td>\n1,800<\/td>\n<\/tr>\n
i=45<\/td>\n14<\/td>\n40<\/td>\n100<\/td>\n100<\/td>\n230<\/td>\n450<\/td>\n1,500<\/td>\n<\/tr>\n
i=60<\/td>\n17<\/td>\n45<\/td>\n120<\/td>\n120<\/td>\n260<\/td>\n500<\/td>\n1,600<\/td>\n<\/tr>\n
i=90<\/td>\n14<\/td>\n40<\/td>\n100<\/td>\n100<\/td>\n230<\/td>\n450<\/td>\n1,500<\/td>\n<\/tr>\n
i=100<\/td>\n14<\/td>\n40<\/td>\n100<\/td>\n100<\/td>\n230<\/td>\n450<\/td>\n1,500<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

<\/p>\n

Maximum Rated Input Speed (RPM) by Frame<\/h3>\n
\n\n\n\n\n\n
\u0e40\u0e1f\u0e23\u0e21<\/th>\n042<\/th>\n060<\/th>\n090<\/th>\n115<\/th>\n142<\/th>\n180<\/th>\n220<\/th>\n<\/tr>\n<\/thead>\n
Max RPM<\/td>\n5,000<\/td>\n5,000<\/td>\n5,000<\/td>\n4,000<\/td>\n4,000<\/td>\n3,000<\/td>\n2,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n
\u25b8 Selection Rule: <\/span>
\nCalculate Tout<\/sub> = Motor rated torque \u00d7 Ratio \u00d7 Efficiency. Select frame where rated torque \u2265 Tout<\/sub> \u00d7 1.2. Also check max input RPM<\/strong> \u2014 larger frames have lower limits. Need a different output geometry?<\/span><\/div>\n<\/section>\n

\"BAB \"BAB<\/p>\n

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Four Engineering Decisions Behind the \u22643 Arcmin Specification<\/h2>\n

Specifying a high-precision planetary gearbox<\/strong> at \u22643 arcmin across seven frame sizes and torque outputs up to 2,000 N\u00b7m requires coordinated manufacturing decisions across material, tooth geometry, assembly method, and bearing design. Each of these decisions keeps the specification stable throughout service life \u2014 not just at first commissioning.<\/p>\n

\"Planetary<\/p>\n

    \n
  1. 1<\/span>\n
    \n

    Full-Body Alloy Steel Hardening \u2014 Not Surface-Only<\/strong><\/p>\n

    Standard industrial gear reducers use case-hardening that leaves a soft core vulnerable to plastic deformation under sustained load. EP-BAB gear teeth are hardened throughout \u2014 not just at the tooth surface. Tooth geometry remains stable under cyclic contact stress, so backlash does not creep upward as soft-core gears deform over time.<\/p>\n<\/div>\n<\/li>\n

  2. 2<\/span>\n
    \n

    ANSYS Finite Element Tooth-Strength Analysis with Profile and Lead Corrections<\/strong><\/p>\n

    Each gear pair is FEA-modelled under full rated load to identify stress concentrations before physical prototyping. The analysis drives tooth profile and lead corrections applied during grinding \u2014 pre-compensating for elastic tooth deflection under load so mesh geometry is consistent at rated torque. This is standard practice on every EP-BAB unit produced.<\/p>\n<\/div>\n<\/li>\n

  3. 3<\/span>\n
    \n

    Integrated One-Piece Planet Carrier and Output Shaft<\/strong><\/p>\n

    Conventional planetary gearbox designs use a separate planet carrier bolted or keyed to the output shaft \u2014 an assembly interface contributing its own tolerance stack to total backlash. EP-BAB machines carrier and output shaft from a single billet, eliminating this interface. This one design decision directly enables the \u22643 arcmin specification at all seven frame sizes without requiring exotic materials or ultra-tight individual component tolerances.<\/p>\n<\/div>\n<\/li>\n

  4. 4<\/span>\n
    \n

    Large-Span Oversized Output Shaft Bearings<\/strong><\/p>\n

    EP-BAB output shafts run in oversized bearings with greater span than conventional designs. This maximises torsional stiffness and minimises radial runout under cantilevered load \u2014 both directly affecting measured backlash and positional repeatability at the output flange. Larger bearing span also extends L10 bearing life at equivalent load.<\/p>\n<\/div>\n<\/li>\n<\/ol>\n<\/section>\n

    <\/p>\n

    \n

    Model Designation Guide \u2014 How to Read an EP-BAB Part Number<\/h2>\n
    \n
    EP-BAB 090 \/ 25 \/ S2 \/ P1 \/ T1<\/div>\n
    \n
    \n
    EP-BAB<\/div>\n
    \u0e40\u0e01\u0e32\u0e2b\u0e25\u0e35 \u0e40\u0e2d\u0e40\u0e27\u0e2d\u0e23\u0e4c\u0e1e\u0e32\u0e27\u0e40\u0e27\u0e2d\u0e23\u0e4c
    \nBAB Series<\/div>\n<\/div>\n
    \n
    090<\/div>\n
    Housing diameter
    \n90 mm<\/div>\n<\/div>\n
    \n
    25<\/div>\n
    Gear ratio
    \ni = 25:1<\/div>\n<\/div>\n
    \n
    S2<\/div>\n
    Output shaft
    \nwith keyway<\/div>\n<\/div>\n
    \n
    \u0e1e\u0e351<\/div>\n
    Precision grade
    \n\u22643 arcmin<\/div>\n<\/div>\n
    \n
    T1<\/div>\n
    Input flange type
    \n(motor-matched)<\/div>\n<\/div>\n<\/div>\n<\/div>\n
    \n\n\n\n\n\n\n\n\n\n\n
    Position<\/th>\nCode<\/th>\nMeaning<\/th>\n<\/tr>\n<\/thead>\n
    \u0e0a\u0e38\u0e14<\/td>\nEP-BAB<\/td>\nKorea Ever-Power high-precision planetary gearbox, standard flange<\/td>\n<\/tr>\n
    Frame Size<\/td>\n042\/060\/090\/115\/142\/180\/220<\/td>\nHousing diameter in mm. Also: BAB060A, BAB090A adapter variants<\/td>\n<\/tr>\n
    Gear Ratio<\/td>\n3\u201310 \/ 15\u2013100<\/td>\nSingle-stage 3,4,5,6,7,8,9,10 \u00b7 Two-stage 15, 20, 25\u2026100<\/td>\n<\/tr>\n
    Output Shaft<\/td>\nS1 \/ S2<\/td>\nS1: Smooth (no keyway) \u00b7 S2: With keyway<\/td>\n<\/tr>\n
    Backlash Grade<\/td>\nP1 \/ P2<\/td>\nP1: Precision \u22643’\/\u22645′ (single\/two-stage) \u00b7 P2: Standard \u22648’\/\u226412′<\/td>\n<\/tr>\n
    Input Flange<\/td>\nT1 \/ T2<\/td>\nInput adapter plate type \u2014 specify servo motor model for correct match<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/section>\n

    \"BAB<\/p>\n

    \n

    Applications of EP-BAB High-Precision Planetary Gearbox in Korean Industry<\/h2>\n
    \n
    \n
    \n

    Industrial Robot Joint Actuators<\/h3>\n

    Six-axis robots in automotive welding, electronics assembly, and semiconductor handling require precision servo gear reducers where backlash directly determines end-effector positioning accuracy. EP-BAB090 through EP-BAB142 cover the 1,000\u20134,000 W servo motor range typical of robot shoulder, elbow, and wrist joints in 5\u201320 kg payload systems. P1 \u22643 arcmin eliminates backlash compensation algorithms in the robot controller, maintaining accuracy across temperature cycles. Pairs with precision CV drive shafts<\/a> for extended robot arm configurations.<\/p>\n<\/div>\n

    \n

    CNC 4th & 5th Axis Rotary Tables<\/h3>\n

    4th and 5th axis rotary tables demand a precision gear reducer<\/strong> with backlash below the part tolerance at the cutting point. EP-BAB115 and EP-BAB142 at 25:1\u201350:1 deliver output torque for table clamping reaction loads during heavy metal cutting while maintaining angular accuracy for multi-surface aerospace and mould parts in single setup. This is why Korea’s precision machine tool sector specifies this performance class.<\/p>\n<\/div>\n

    \n

    Semiconductor & Display Manufacturing<\/h3>\n

    Korea’s dominant position in global semiconductor and flat-panel display production drives demand for precision servo drives<\/strong> at every process step \u2014 wafer handlers, exposure stages, bonding heads. EP-BAB042 and EP-BAB060 meet cleanroom particle qualification criteria with sealed housing preventing lubricant migration that contaminates photolithography environments.<\/p>\n<\/div>\n<\/div>\n

    \n
    \n

    Application Reference<\/h3>\n