EP-FAB Series High Precision Planetary Gearbox | Square Flange Inline

EP-FAB Series — Square-Flange High Precision Planetary Gearbox

Servo-ready inline planetary gearbox with a square output flange, designed for the most demanding CNC, robotic, and automation applications across Northeast Asia and beyond.

The EP-FAB Series represents the culmination of Korea Ever-Power's engineering philosophy: deliver European-grade precision through a transmission device engineered for the exact demands of East Asian automation markets. The square mounting flange allows direct adapter-free integration with Siemens, Mitsubishi, Yaskawa, Panasonic, and other servo brands popular across Korea, Japan, and Southeast Asia.

A defining advantage is the dual-stage architecture — single-stage (i=3–10) and two-stage (i=15–100) configurations share the same external footprint, so machine builders can change reduction ratios during design revisions without re-engineering the motor mount.

• ▶Square output flange — direct ISO servo motor interface, no adapter plate needed
• ▶NYOGEL 792D synthetic grease — lifetime lubrication, no maintenance intervals
• ▶Oversized output bearing — absorbs radial force up to 50,000 N at EP-FAB220
• ▶Any-direction installation — horizontal, vertical, or inverted without performance loss
• ▶Noise as low as ≤56 dB(A) at 3,000 rpm (EP-FAB042) — suitable for lab and medical environments

EP-FAB series: 9 frame sizes, 042–220 mm 

Profile-Ground Helical Gears

Case-hardened helical planet gears mesh with a profile-ground ring gear, delivering smooth torque transmission and lower vibration than straight spur-gear designs.

Oversized Output Bearing

Large-diameter bearing at the output absorbs combined radial and axial loads without external support — rated to 50,000 N at EP-FAB220.

IP65 Sealed Housing

Precision-machined sealing surfaces and all-direction oil seals achieve IP65 — suitable for coolant mist environments on machining centers.

S1 / S2 Output Shafts

Smooth round (S1) and splined/clamp (S2) shaft options available. S1 is standard for coupling connections; S2 for direct drive or rigid couplings.

Universal Motor Adapters

Clamp-ring adapter system (C1–C10 per frame size) fits Siemens 1FT6, Mitsubishi HG, Yaskawa SGMJV, Panasonic MHMD, and hundreds of other servo flanges.

Wide Temperature Range

NYOGEL 792D maintains viscosity from -10°C to +90°C. No warm-up cycle needed for cold-start in Korean and Northern-Chinese winter conditions.

EP-FAB clamp-ring motor assembly — 8 steps

The EP-FAB uses a clamp-ring adapter plate system that allows field assembly without special tools. Follow this sequence to achieve the full rated torque and retain the precision grade after assembly:

1. 1Verify motor-to-gearbox specification compatibility; clean all mating surfaces with lint-free cloth.
2. 2Remove the adapter plate from the gearbox input; confirm pilot bore diameter matches motor shaft.
3. 3Remove the motor shaft key if present; for keyed shafts, retain and install the flat key as required by the coupling type.
4. 4If motor shaft diameter requires a bushing, install the correct reduction bushing for the frame size.
5. 5Insert motor shaft into adapter bore; hand-tighten the 4 adapter disc screws in a cross pattern (1–3–2–4).
6. 6Torque adapter screws to the Table 1 values with a ×5% safety margin. For EP-FAB090 (shaft ≤19 mm): M5×0.8P×14L screw, 4 mm hex key, 9.8 Nm.
7. 7Mount the motor and gearbox assembly vertically; torque the motor clamping screws to the Table 2 values in a cross pattern.
8. 8Install and tighten the stop pin to the specified torque. Run a no-load test at rated speed before applying load.

Industrial Robots

6-axis robot joints (axes 1–4). High torque density and P0 backlash enable sub-0.05 mm TCP repeatability at full cycle speed.

CNC 가공 센터

Rotary table and B/C-axis drives for 4- and 5-axis machining. Oversized output bearing absorbs cutting forces directly.

Laser Cutting Gantries

High-acceleration gantry axes (>2 g) needing ≤0.01 mm repeatability. EP-FAB042–EP-FAB090 most common range.

Pharmaceutical & Medical

Filling machine indexers and dispensing robots. IP65 + lifetime lube eliminate contamination risk near clean rooms.

Semiconductor & FPD

Wafer handling, die bonder axes, FPD transfer robots. P0 grade ≤1 arc-min meets the most demanding IC-handling positioning specs.

포장 기계

Indexing turntables, form-fill-seal drives, case-packing servo axes. 20,000 hr life minimizes downtime on continuous production lines.

Same EP-FAB internals, 90° bevel output. Ideal when motor and load axes must be perpendicular. Ratios up to 200:1.

Round output flange for high-speed servo applications. 10,000 rpm max input, 30,000 hr design life — step up when throughput matters.

Self-locking capability and large single-stage reduction (up to 100:1) as a pre- or post-stage complement to EP-FAB.

Constant-velocity couplings for connecting EP-FAB output to misaligned or articulating load shafts in mobile or robotic joints.

Q: What is the difference between the EP-FAB (inline) and EP-FABR (right-angle) series?

The EP-FAB has a coaxial (inline) output — motor and load shafts share the same centreline. The EP-FABR uses identical internal gearing but adds a bevel gear stage at the output, creating a 90° angle between input and output axes. Both share identical frame mounting dimensions and the same clamp-ring motor adapter system, so a machine can be re-designed between inline and right-angle output without changing the motor mount plate or servo drive parameters.

Q: Can the EP-FAB be used with a stepper motor instead of a servo?

Yes. The clamp-ring adapter system accepts both servo and stepper motor flanges. Since stepper motors typically run below 3,000 rpm, the gearbox operates well within its thermal and speed limits. For stepper-motor applications, P2 grade (≤5 arc-min) is almost always sufficient — P1 is rarely justified because the stepper's open-loop positioning error typically exceeds the gearbox backlash at P2 anyway. A two-stage EP-FAB at i=25–50 is the most popular configuration for stepper-driven CNC axes.

Q: How does the radial force rating change when the load is not applied at shaft centre?

The published F_rad values in the specification table assume the radial force acts at the shaft midpoint (X = L/2). When the force acts at a different position X along the shaft, a position load factor K_a must be applied: F_rad_allowable = K_a × F_rad_rated. K_a values are given in the EP-FAB dimension drawings and the radial-force chart (F_rad vs. output speed n₂). At X = 0 (force at gearbox face), K_a drops to approximately 0.5–0.6 depending on frame size; at X = L, K_a is typically 0.7–0.8. The additional axial force component must satisfy F_ax_actual = 0.2 × F_rad and F_ax_actual = 0.1 × F_ax_rated simultaneously.

Q: Does the NYOGEL 792D lubricant require periodic replacement?

No. The EP-FAB is sealed and filled with NYOGEL 792D synthetic grease for the full 20,000-hour service life under standard operating conditions (continuous S1 duty at rated load, -10°C to +90°C). No grease replacement is required or recommended. If operating continuously above 70°C, or under shock loading above 2× rated torque, consult the Korea Ever-Power applications team for an adjusted service interval. Note: the service life is halved when running at the maximum rated speed continuously — the rated speed listed in the specification table assumes a mean load of 50% of the rated torque.

Q: What noise specification should I specify for a cleanroom or medical environment?

The EP-FAB042 produces ≤56 dB(A) at 3,000 rpm no-load in an anechoic test environment. This corresponds approximately to the ambient level of a quiet office. In real-world installations, actual noise will be higher due to motor harmonics, mechanical resonance of the machine frame, and load-induced gear mesh excitation — typically 3–8 dB above the catalogue value. For noise-critical environments (ISO Class 5 cleanrooms, diagnostic imaging labs), specify the EP-FAB042 or EP-FAB060 at P0 grade and ask for an individual noise test certificate at the time of ordering.

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"IP65 rating genuinely survives our coolant flood environment — we have units running for two years on a horizontal machining center with full coolant mist exposure. Direct fit with Yaskawa Sigma-7 motors out of the box."

"Specified EP-FAB142 dual-stage at i=50 for a heavy-duty rotary table. Excellent torsional rigidity — exactly 50 Nm/arc-min as published. P0 lead time was 3 weeks longer than P1, but the accuracy for 5-axis turning was worth it."

"Running EP-FAB060 units on our OLED panel transfer robots. The ≤58 dB(A) noise spec holds true in our ISO Class 6 cleanroom — no acoustic interference with the vibration sensors on the panel stage."

"We evaluated EP-FAB against two European competitors for our new delta-robot packaging line. The EP-FAB115 matched them on P1 backlash and came in at 35% lower unit cost. After 6 months at 120 cycles/min, still within original spec."