EP-FABR Series Right-Angle Planetary Gearbox | 90° Bevel Output

EP-FABR Series — 90° Bevel Right-Angle Planetary Gearbox

High-precision planetary gearbox with a bevel gear output stage — perpendicular motor-to-load axis, compact package, servo-grade backlash. Shares the identical square-flange motor adapter system as the EP-FAB inline series.

EP-FAB — Inline Output

Motor shaft and load shaft share the same centreline. Compact in the axial direction. Standard choice for most CNC, robot, and gantry applications.

EP-FABR — 90° Bevel Output

Motor axis is perpendicular to the load shaft. Reduces machine width, enables corner-mounted drives, and allows motor to be tucked behind the load axis plane.

The EP-FABR Series is built on the same proven planetary gearbox platform as the EP-FAB. The internal ring gear, planet gears, and carrier assembly are identical — a high-precision bevel gear set is added at the output end to redirect the torque 90°. This architecture means the EP-FABR delivers:

• ◆Identical motor adapter compatibility — same C1–C10 clamp ring system as EP-FAB
• ◆Ratios up to 200:1 in two stages — no additional gearbox stage needed
• ◆NYOGEL 792D lifetime grease — same sealed-for-life maintenance profile
• ◆IP65 protection — identical ingress protection to the inline EP-FAB
• ◆Any mounting direction — output shaft can point in any of four 90° orientations

EP-FABR shares frame dimensions with EP-FAB — easy design swap

90° Bevel Output Stage

Precision spiral bevel gears redirect output torque 90° from the motor axis. The bevel set is matched and lapped as a pair, minimising backlash and noise at the output interface.

Profile-Ground Planetary Internals

Same DIN 5 profile-ground helical planet gears and ring gear as the EP-FAB inline. Identical gear quality ensures equivalent torque density and service life.

200:1 in Two Stages

Two-stage EP-FABR reaches i=200 in a single unit. Available ratios: 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, 200.

Same Motor Adapter System

Identical C1–C10 clamp-ring adapters as the EP-FAB. Any motor validated on the EP-FAB inline mounts directly to the EP-FABR without modification.

IP65 Full Sealing

Both the planetary stage and bevel housing are fully sealed to IP65. Suitable for coolant mist and washdown environments in food processing and machining.

4-Position Output Orientation

The bevel output housing can be oriented in four 90° positions to point the output shaft in any required direction relative to the motor, without modifying the gearbox internals.

The EP-FABR uses the same clamp-ring motor adapter assembly process as the EP-FAB inline. The eight assembly steps — surface cleaning, adapter plate removal, shaft key management, bushing installation, hand-tighten, cross-torque, clamp torque, stop-pin — are identical. Two additional considerations apply specifically to the right-angle configuration:

EP-FABR installation diagram — output shaft orientation and coupling clearance

Every EP-FABR unit goes through the same five-stage quality process as the EP-FAB, with one additional bevel-specific check:

• ◆DIN 5 profile grinding — ring gear and planet gears, same as EP-FAB inline
• ◆CMM housing inspection — bore alignment verified before bevel stage assembly
• ◆Bevel contact pattern verification — tooth contact pattern is checked with marking compound after assembly; units outside the specified contact zone are reworked
• ◆Loaded noise test — bevel stage contributes additional noise; units exceeding ≤61–74 dB(A) limits are rejected
• ◆Backlash measurement and grade stamping — P0/P1/P2 stamped on nameplate after individual verification
• ◆IP65 pneumatic seal test — bevel housing output seal pressure-tested separately from planetary housing

Right-Angle CNC Axes

B-axis or A-axis rotary drives on trunnion-type 5-axis machining centers where the servo must be tucked laterally behind the tilting axis.

Robot Wrist Joints

Axes 5 and 6 on articulated robots where the drive axis is perpendicular to the wrist output. Compact envelope and high ratio in a single stage reduces link weight.

Corner-Drive Conveyors

Servo-driven roller tables and corner transfer conveyors in automotive and e-commerce logistics. High ratio (up to 200:1) eliminates a separate reduction stage.

Winding & Unwinding Machines

Film, foil, and wire winders where the tension servo motor is mounted at 90° to the mandrel axis. Two-stage EP-FABR120–EP-FABR200 covers most winding duty cycles.

Food & Beverage Processing

Filling machine carousels, capping heads, and labelling turntables. IP65 + NYOGEL 792D withstand high-pressure washdown without lubrication maintenance.

EV & Battery Assembly Lines

Module stacking robots and cell handling gantries where servo motors are folded behind the axis to minimise the robot arm cross-section inside the battery tray.

Same internals, coaxial output. Choose when backlash ≤1 arc-min (P0) is required, or when axial space is not a constraint.

Right-angle variant of the high-speed EP-FAD round-flange series. 10,000 rpm input capability with 90° output for high-speed applications.

Alternative right-angle solution with self-locking capability. Lower efficiency than EP-FABR but lower cost for non-precision, low-cycle applications.

Constant-velocity couplings to connect EP-FABR output to articulating or misaligned load shafts in mobile robot joints and AGV drivetrains.

Q: Why is the EP-FABR P0 backlash ≤2 arc-min instead of ≤1 arc-min like the EP-FAB?

The bevel gear output stage adds its own backlash to the planetary stage backlash. Even with precision-lapped bevel pairs, the additional stage contributes approximately 1 arc-min compared to a coaxial output. The EP-FABR P0 specification of ≤2 arc-min is the combined planetary + bevel backlash. For applications where ≤1 arc-min is a hard requirement, the inline EP-FAB is the correct choice — if a right-angle drive is also needed, a separate precision bevel gearbox can be placed downstream.

Q: Can I use the same servo motor adapter on both EP-FAB and EP-FABR?

Yes — this is a deliberate design feature. The input (motor) end of the EP-FABR uses an identical frame dimension and clamp-ring adapter system to the EP-FAB. If you have an existing EP-FAB motor adapter kit (C1–C10 for your servo motor), it mounts directly on the corresponding EP-FABR frame size with no modification. This allows design flexibility during machine development — you can switch from inline to right-angle output without re-qualifying the motor or changing the servo amplifier parameters.

Q: Why is efficiency lower on the EP-FABR than the EP-FAB?

The bevel gear stage introduces additional friction losses. The EP-FAB inline efficiency is ≥97% (1-stage) because energy flows in a straight line through the planetary set. The EP-FABR efficiency is ≥95% (1-stage) — the 2% difference represents the bevel pair mesh loss. In most servo applications this difference is insignificant (2% of 1 kW = 20 W). However, for very large machines or continuous high-torque duty, the inline EP-FAB should be preferred if the layout permits.

Q: What is the maximum ratio available in a single EP-FABR unit?

The two-stage EP-FABR reaches i=200:1 in a single gearbox unit. Available two-stage ratios are: 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 120, 140, 160, 180, and 200. This is the highest single-unit ratio in the Korea Ever-Power right-angle precision gearbox range. For ratios above 200, a two-gearbox tandem configuration using EP-FABR units is available on special order.

Q: Can the output shaft direction be changed after delivery?

Yes. The bevel output housing can be repositioned in 90° increments (four positions) at any time. Loosen the four housing retention bolts, rotate to the desired orientation, and re-torque the bolts to the specification in the installation manual. This can be done in the field without disassembling the planetary stage or the motor. Note: for output-down orientations, verify that the bevel housing breather port is at the highest point to prevent oil pooling — consult Korea Ever-Power if the desired orientation places the breather below the gear mesh level.

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"Used EP-FABR220 two-stage at i=100 on a large-format film winding machine. Motor is tucked beside the frame, keeping the operator walkway clear. Running for 14 months at 3 shifts, no backlash growth, IP65 holds through daily washdown."

"Deployed EP-FABR090-P1 on axis 5 of a collaborative robot prototype. The 4-position output housing reorientation feature let us iterate the wrist layout three times without replacing the gearbox — saved significant re-engineering cost."

"We needed i=160 right-angle with P1 accuracy for a servo-driven carousel in our canning line. EP-FABR180 two-stage at i=160 was a single-unit solution — no tandem gearbox needed. Motor adapter fit our Mitsubishi HG-SR153 directly."