When the Direct-Insert Planetary Gearbox Saves 22mm and Why It Matters

22 mm

Axial Length Saved — FADS vs FAD

Adapter Plate Crevices — FADS

ISO 5

Cleanroom — FADS Validated

Same

Grades, Ratios, Life, IP

≤1 arc-min

P0 Available — Both Series

IP65

Every Unit — Both Series

Engineering Context

One Series, Two Configurations — What EP-FADS Removes and What Happens When It Does

EP-FAD series planetary gearbox with C-series motor adapter ring installation showing the adapter plate and clamp ring that EP-FADS eliminates for 22mm axial saving

EP-FAD standard configuration: motor mounts to the C-series adapter ring, which is bolted to the gearbox input housing. The motor shaft passes through the adapter ring into the clamp coupling. EP-FADS removes the adapter ring entirely — the motor shaft inserts directly into the gearbox input bore, saving the full axial stack of the adapter ring assembly.

EP-FAD and EP-FADS are the same planetary gearbox. They use the same ring gear, the same planet gears, the same output shaft, the same housing dimensions, and the same NYOGEL 792D lubrication. They are offered at the same backlash grades (P0, P1, P2, standard), the same gear ratios, the same IP65 rating, and the same 30,000-hour design life. Every performance specification is identical.

The single difference is the motor input interface. EP-FAD uses the standard C1–C10 adapter ring system: a precision-machined aluminium ring bolts to the gearbox input housing, centres on the motor’s pilot boss, and the motor output shaft passes through the ring into a clamp coupling. The adapter ring adds 12–15 mm of axial thickness to the assembly, and the external clamp ring adds another 7–8 mm. Total axial addition: 18–22 mm beyond the gearbox input housing face.

EP-FADS eliminates the adapter ring entirely. The motor output shaft inserts directly into a bore machined into the gearbox input end of the housing. There is no separate adapter plate, no external clamp ring, and no bolted flange interface between the motor and the gearbox housing face. The motor body contacts the gearbox input housing face directly — the only axial space consumed is the length of the gearbox body itself. Axial addition beyond the gearbox housing: zero.

The 22 mm difference — which has been cited in Korea Ever-Power’s application guides for surgical robots, medical imaging, filling machines, and cleanroom automation — is the axial stack of the adapter ring assembly that EP-FADS removes. This guide explains exactly where those 22 mm come from, when they matter, and when the choice between FAD and FADS is irrelevant to the application design.

🔍

The Second Difference That Matters in Medical and Cleanroom Applications

The 22 mm axial saving is the headline difference, but in sterile and cleanroom environments the more important difference is the elimination of the adapter plate crevice. In EP-FAD, the joint between the adapter ring outer edge and the gearbox input housing face creates a narrow annular crevice — typically 0.1–0.3 mm wide and 5–8 mm deep — that runs around the full circumference of the gearbox input end. This crevice cannot be fully cleaned by surface wiping: biological residue, cleaning agent, and process particulate accumulate in it. In a surgical robot wrist operating in a sterile field, any surface feature that cannot be cleaned to sterilisation standards is a sterility validation concern. EP-FADS has no external adapter plate and therefore no such crevice — the input end of the gearbox is a smooth continuous housing surface that is wiped clean in the same pass as the rest of the gearbox body.

Axial Dimension Comparison — Where the 22mm Comes From

The diagrams below show the axial stack of EP-FAD (with standard adapter ring) versus EP-FADS (direct-insert) for the same motor and gearbox combination. Each component’s approximate axial contribution is shown, with the total assembly length and the dimension savings labelled.

CONFIGURATION A — EP-FAD with C-Series Adapter Ring

Motor body
(fixed)

shaft ext.

Adapter
ring
~13mm

clamp ~7mm

EP-FAD gearbox body
(planetary stages + output)

← +20mm (adapter + clamp) →

Crevice at adapter-to-housing joint — circumferential, cannot be fully cleaned

CONFIGURATION B — EP-FADS Direct-Insert (Same Motor + Same Gearbox Performance)

Motor body
(same)

shaft inside

EP-FADS gearbox body — shaft inserts directly into bore
No adapter plate. No external clamp ring. Smooth input face.

← This space is part of gearbox body → No addition

Smooth continuous housing face — no crevice, full surface cleanability

−20mm

Axial Length Saved
(typical)

−1

Adapter Ring
Eliminated

Crevices at
Input End

Same

Backlash, Life,
IP, Speed

Dimensions shown are representative for EP-FADS / EP-FAD 060–090 mm frame sizes. Actual adapter ring thickness and clamp ring thickness vary by C-code and frame size — confirm exact dimensions from Korea Ever-Power’s dimensional drawings for the specific motor and frame size combination. The gearbox body dimensions (planetary stages, output shaft) are identical between EP-FAD and EP-FADS.

Selection Logic

When FADS Matters and When FAD Is Equally Good — The Three Selection Cases

The choice between EP-FAD and EP-FADS falls into three distinct cases. In Case A, the 22 mm axial saving is genuinely decisive for the design. In Case B, the crevice-free input face is the primary driver, even when axial space is not the constraint. In Case C, neither factor matters and the choice is arbitrary — FAD is typically easier to specify because the C1–C10 adapter system accommodates any motor without confirming shaft dimensions.

Case A — Axial Space Is the Constraint

The 22mm saving determines whether the design fits

In Case A, the gearbox must fit within a mechanical envelope that does not accommodate the additional 20 mm of an adapter ring assembly. The most common examples are robot wrist joints, where the link structure has a fixed outer diameter and the gearbox + motor combination must fit within that diameter axially; surgical instruments, where the gearbox is inside a housing that has a fixed overall length; and filling machine nozzle axes, where the motor-gearbox-nozzle assembly must fit between two fixed machine elements with no room to expand.

In these applications, the design engineer has typically already determined that the FAD + adapter configuration does not fit the envelope — EP-FADS is specified because there is no alternative that achieves the required performance in the available space. The 22 mm is not a convenience; it is the difference between the design working and not working.

Typical applications: Surgical robot wrist J4/J5/J6 (trocar port diameter constraint); SCARA robot fourth axis (rigid arm envelope); filling machine nozzle axis (fixed inter-station pitch); miniaturised lab automation arm; medical imaging robot (patient clearance constraint).

Case B — Cleanability Is the Constraint

Adapter plate crevice is a sterility or contamination risk

In Case B, axial space may be adequate for the FAD + adapter configuration, but the adapter plate crevice creates an unacceptable contamination risk in the deployment environment. This case applies to robots operating in ISO Class 4–6 cleanrooms for pharmaceutical compounding, semiconductor handling, or cell culture — where any surface feature that cannot be reliably cleaned is a facility validation concern. It also applies to surgical instrument design, where the full instrument surface must be cleanable to sterilisation-cycle specifications.

In Case B, the design engineer could fit the adapter ring in the available space — but they choose FADS because the smooth, crevice-free input face simplifies cleaning validation and reduces the risk of biological residue accumulation in a location that is difficult to inspect and verify as clean. This is a regulatory and quality-assurance decision, not a geometric constraint.

Typical applications: ISO Class 5 cleanroom drug discovery robot; pharmaceutical compounding robot; semiconductor wafer handler; surgical robot wrist (both Case A and B often apply simultaneously); sterile parenteral filling machine nozzle.

Case C — Neither Constraint Applies

FAD and FADS are both valid; FAD is typically simpler to order

In Case C, the application has ample axial clearance beyond the gearbox face and is deployed in a standard industrial environment where the adapter plate crevice has no significance. In this case, EP-FAD and EP-FADS are functionally identical — the same grades, ratios, life, IP, and performance. The only practical considerations are ordering convenience and motor shaft diameter confirmation.

EP-FAD with a C-code adapter is typically easier to order because the C1–C10 system covers any motor with a single code without requiring confirmation of the motor output shaft diameter. EP-FADS requires confirming that the motor shaft diameter falls within the FADS input bore range for the selected frame size. For a standard industrial robot base joint, CNC machine tool axis, or conveyor drive with no space or sterility constraint, the choice is arbitrary — Korea Ever-Power recommends EP-FAD for its procurement simplicity in Case C.

Typical applications: Standard robot base joints J1/J2/J3 (large space available); CNC machining centre rotary axes (ample space); AGV traction drives; standard packaging machine axes; any application where axial space and cleanability are not constraints.

Complete Comparison

EP-FAD vs EP-FADS — Complete Specification Comparison

The table below shows every specification parameter for both series. Parameters highlighted in amber are the ones that differ; all other parameters are identical. The practical implication: specifying FADS where FAD would technically work costs nothing in performance — the only cost is confirming the motor shaft diameter against the FADS bore specification.

The identity of gear train, lubrication, and sealing between FAD and FADS has a direct consequence for machine qualification documentation. In medical device development under EU MDR or IEC 60601, each component in the drive train must be qualified against its relevant standard. Because EP-FAD and EP-FADS share the same internal gear train, the backlash grade testing (per-unit stamp), IP pressure test record, and gear accuracy documentation are directly transferable between the two series. An OEM who has qualified EP-FAD P0 for a robot prototype and subsequently moves to EP-FADS P0 for the production version — because the production enclosure is tighter — does not require a new gear performance qualification. The mechanical performance parameters (backlash, life, rated torque, IP) are unchanged. Only the motor interface configuration changes, and the shaft-compatibility confirmation for FADS takes the place of the C-code qualification for FAD. This documentation portability significantly reduces the re-qualification effort when transitioning from prototype to production on a constrained-space design.

A second implication of the identical gear train is that EP-FAD and EP-FADS gearboxes can be used interchangeably as spare parts within the same machine, provided the motor interface is adjusted. If a FADS unit on a production machine requires replacement and only FAD stock is available (or vice versa), the replacement is possible by adding or removing the adapter ring assembly — the gear train, output shaft, and all downstream mechanical connections remain compatible. This spare parts flexibility is valuable in production environments where machine downtime has a high cost and spare parts inventory is managed for cost efficiency.

Parameter	EP-FAD (with C-series adapter)	EP-FADS (direct-insert)	Different?
Motor input interface	C1–C10 adapter ring + external clamp ring Adapter ring bolts to input housing	Motor shaft inserts directly into gearbox bore No external adapter plate	YES
Total axial length (gearbox + motor interface)	Gearbox body + 18–22 mm Adapter plate + clamp ring	Gearbox body only Zero additional axial	YES
Input face crevice	Circumferential crevice at adapter-housing joint ~0.1–0.3 mm wide, ~5–8 mm deep	None — smooth housing face Wiped clean in single pass	YES
Motor mounting method	Motor bolts to adapter ring Standard C-code bolt pattern	Motor bolts directly to gearbox input housing face Motor-specific bolt pattern	YES
Motor shaft diameter confirmation	Not required — clamp ring accommodates range C-code specifies pilot, not shaft ∅	Required — must fall within FADS bore tolerance Confirm shaft ∅ at order	YES
Gear train (ring, planet, sun)	✓ Identical	✓ Identical	No
Backlash grades (P0/P1/P2/Std)	✓ Same grades available	✓ Same grades available	No
Gear ratios	✓ Same catalogue ratios	✓ Same catalogue ratios	No
Output shaft dimensions	✓ Identical	✓ Identical	No
Frame sizes (047–255 mm)	✓ Full range	✓ Full range	No
Max input speed	✓ 6,000–10,000 rpm	✓ 6,000–10,000 rpm	No
IP rating	✓ IP65 every unit	✓ IP65 every unit	No
Lubrication	✓ NYOGEL 792D sealed	✓ NYOGEL 792D sealed	No
Design life	✓ 30,000 hr S1	✓ 30,000 hr S1	No
Per-unit backlash stamp	✓ Yes (P0/P1 measured value)	✓ Yes (P0/P1 measured value)	No
Gear accuracy class	✓ DIN Class 5	✓ DIN Class 5	No
Unit price (same grade)	✓ Equivalent	✓ Equivalent	No

Rows highlighted amber differ between EP-FAD and EP-FADS. Green rows are identical. EP-FAD and EP-FADS are the same gearbox with different motor input interface configurations — not different product families.

Application Examples

Six Application Examples — Choosing Between FAD and FADS

EP-FAD series high speed precision planetary gearbox with standard C-series motor adapter ring — used where axial space and cleanability are not constraints

Top: EP-FADS — smooth input face, no adapter plate. Bottom: EP-FAD — C-series adapter ring visible at motor input end. Identical gearbox performance; different motor interface geometry.

The six examples below span the full range from clear FADS cases (examples A, B, C, F) to clear FAD cases (examples D, E). In practice, most applications fall clearly into one category — the engineering constraint that determines the choice (axial space or cleanability) is either present or absent, rarely marginal. When it is genuinely marginal (e.g., the available axial space is 23 mm, which barely accommodates a 22 mm adapter ring), Korea Ever-Power recommends FADS to provide a design margin — the cost is the same, and the 22 mm saving converts a tight fit into a comfortable one.

One additional consideration that affects the FADS vs FAD choice in certain applications is shaft alignment sensitivity. In EP-FAD, the motor is centred on the gearbox input by the adapter ring’s pilot bore — the precision of this pilot bore determines the concentricity between the motor output shaft axis and the gearbox input axis. Any eccentricity between these two axes creates a rotating unbalance at the input end, which manifests as vibration at motor rotation frequency. Korea Ever-Power machines the adapter ring pilot bore to ±0.01 mm TIR concentricity — adequate for all standard applications. In EP-FADS, the motor is centred directly by the FADS bore, which is machined as part of the gearbox housing — there is no additional tolerance accumulation from a separate adapter ring. For ultra-low-vibration applications (precision optical instruments, semiconductor wafer handlers, high-speed spindle auxiliary axes), EP-FADS provides marginally better input shaft alignment precision because there is one fewer manufactured interface in the alignment stack.

Surgical robot wrist J5/J6 — Choose FADS

The trocar port diameter constrains the wrist link outer diameter. The J5/J6 gearbox + motor assembly must fit within the link. With EP-FAD + adapter, the assembly is 22 mm longer — the cable routing for encoder signals must run externally along the link because the hollow interior cannot accommodate the longer motor end. EP-FADS eliminates this: the shorter assembly allows internal cable routing, and the smooth input face satisfies sterility cleaning validation. Both axial constraint (Case A) and crevice (Case B) apply.

Specification: EP-FADS P0, frame 047–060, confirm motor shaft ∅ before order.

Pharmaceutical compounding robot — Choose FADS

The robot arm operates in an ISO Class 5 cleanroom with quarterly cleaning validation audits. The cleaning validation protocol requires wiping all external surfaces with IPA-saturated wipes and inspecting for residue accumulation. With EP-FAD, the adapter plate crevice fails inspection — it is designated a “difficult to clean” area requiring additional validation effort and a special cleaning procedure. EP-FADS eliminates the crevice entirely, simplifying the validation protocol to a standard wipe-down. Axial space is not a constraint here (Case B only).

Specification: EP-FADS P0/P1, confirm shaft ∅; include in ISO 14644-3 cleaning validation documentation.

Filling machine nozzle axis — Choose FADS

Rotary filling head nozzle axes are spaced at the container pitch — typically 30–60 mm between adjacent nozzle centrelines. The gearbox + motor assembly must fit within this pitch without collision with adjacent assemblies. With EP-FAD, the adapter plate adds 22 mm to the motor-end profile, which may exceed the available pitch envelope. EP-FADS saves these 22 mm, allowing the assembly to fit within the required pitch. Food-grade NYOGEL 792D sealed and no external grease ports are standard on both — FADS additionally eliminates the adapter plate contamination trap (Case A + partial Case B).

Specification: EP-FADS P0, frame 047–060; confirm motor shaft ∅; NYOGEL sealed (standard).

Robot base joint J1 — Choose FAD (Case C)

The J1 base joint of an industrial robot has a large housing with ample axial space for the motor + adapter ring assembly. The robot operates in a standard factory environment where adapter plate crevices are irrelevant. EP-FAD with C3 adapter ring is the correct specification — the C1–C10 system means the adapter ring is a standard catalogue item, no shaft ∅ confirmation is needed, and procurement is simplified. Specifying FADS here would add unnecessary confirmation steps without any engineering benefit.

Specification: EP-FAB P0/P1 (higher torque for base joint) or EP-FAD, C-code per motor model. No need for FADS.

CNC machining centre rotary table — Choose FAD (Case C)

The B-axis rotary table on a CNC 5-axis machine has a cast housing with a large axial cavity that accommodates the gearbox and motor assembly. The machine tool environment does not require cleanroom sterility validation. EP-FAD P0 is the correct specification — the adapter ring simplifies motor qualification documentation (C1–C10 covers any servo brand) and there is no geometric or sterility reason to prefer FADS.

Specification: EP-FAD P0, frame 090–142, C3 or C5 depending on motor. FADS would work equally but adds no value.

MRI-guided biopsy robot wrist — Choose FADS with aluminium housing

The biopsy robot wrist operates within the MRI fringe field zone. Non-magnetic requirement mandates aluminium housing (standard on EP-FADS; available as option). Axial space at the wrist joint is constrained by the needle guide geometry. Both Case A (axial) and Case B (sterile environment) apply, with the additional non-magnetic requirement eliminating FAD’s steel housing as an option. EP-FADS with aluminium housing is the only standard-catalogue solution that satisfies all three requirements simultaneously: non-magnetic, compact, and crevice-free.

Specification: EP-FADS P0, aluminium housing option, frame 047–060; MRI compatibility declaration from Korea Ever-Power.

Ordering Guide

How to Specify EP-FADS — Motor Shaft Confirmation and Order Format

The one additional step for ordering EP-FADS compared to EP-FAD is confirming that the motor output shaft diameter falls within the FADS input bore range for the selected frame size. This confirmation replaces the C-code selection step — instead of specifying a C-code, you specify the motor shaft diameter (or model number from which Korea Ever-Power determines the shaft diameter).

The motor shaft diameter confirmation is a simple lookup, not a calculation. Korea Ever-Power maintains a reference table of output shaft diameters for all major servo motor brands and model series. When you send the motor model number, the application engineering team cross-references it against this table to confirm the shaft diameter, then checks the FADS bore specification for the ordered frame size. In the overwhelming majority of cases, the answer is a one-line confirmation: the shaft diameter is within the rated bore range and the FADS specification is confirmed. The only situations where this step requires more than one business day are: motors not in the standard reference table (unusual brands or very recent model releases), motor variants with non-standard shaft configurations (special shaft ends, keyed shafts that affect the bore-to-shaft fit), or frame size combinations where the motor shaft is at the extreme of the bore tolerance range and a tighter tolerance bore must be specified as a production option.

For machine designers building a product line with multiple robot models using the same motor platform, a single shaft confirmation covers all machines in the line — once Korea Ever-Power has confirmed that a Yaskawa SGMJV-08 shaft is compatible with EP-FADS 060, that confirmation applies to every subsequent order of the same combination. The design documentation note “EP-FADS 060 bore confirmed for SGMJV-08 shaft ∅ 14h6 on [date], reference KE-FADS-2026-0xxx” provides traceability for the machine’s technical file in the same way that a C-code qualification document does for EP-FAD.

The shaft-to-bore interface in EP-FADS uses a split clamp ring integrated into the gearbox input bore — the same friction-preload principle as the external clamp ring in the C-series adapter, but machined as part of the FADS housing. The clamp bore contracts radially under bolt torque to grip the motor shaft. As with the external clamp ring, this produces zero angular play between the motor shaft and the gearbox input — the shaft and gearbox rotate as a single rigid assembly. The clamp bolt torque specification for FADS is provided by Korea Ever-Power per frame size and shaft diameter; this is the single installation parameter that the assembler must confirm and record, analogous to the adapter ring bolt torque in EP-FAD assembly. The shaft minimum engagement depth specification — the minimum length of motor shaft that must be inserted into the FADS bore before the clamp is tightened — is equally critical: insufficient engagement reduces the friction contact area and lowers the coupling’s torque transmission capacity below the rated value. Korea Ever-Power provides both the clamp bolt torque and the minimum engagement depth in the FADS installation data sheet, which is supplied with every unit and available in advance from application engineering when requested for assembly procedure documentation.

An important maintenance consideration for FADS: because the clamp ring is internal to the gearbox housing, it is not accessible for re-torquing after the housing is sealed. This is not a limitation in normal operation — the clamp bolt torque, once set at assembly, remains stable indefinitely because the preload acts on a steel shaft in a steel clamp ring bore with no dynamic loads that would cause relaxation. However, it does mean that if a motor is removed from a FADS gearbox and re-installed (for example, during a motor replacement on a production machine), the assembly team must follow the FADS installation procedure for the re-installation, including confirming the clamp bolt torques after re-seating the motor shaft. Korea Ever-Power’s installation data sheet covers this procedure for each frame size and shaft diameter combination.

For applications where the motor is not yet selected at the time of the gearbox procurement decision (a common situation in early-stage machine design), EP-FADS can be ordered with a “bore to suit” specification — providing the target shaft diameter range from the prospective motor shortlist, and Korea Ever-Power confirms which FADS bore specification covers that range. This approach allows the gearbox procurement to proceed in parallel with the motor selection process, reducing the programme schedule risk from sequencing the two supplier qualifications.

EP-FADS Order Format

EP-FADS – [Frame Size] – [Ratio] – [Grade] – [Motor Model or Shaft Ø]

Example: EP-FADS – 060 – 10 – P0 – Yaskawa SGMJV-08

Korea Ever-Power looks up the SGMJV-08 output shaft diameter and confirms the FADS bore specification before production.

Alternative: EP-FADS – 060 – 10 – P0 – shaft ∅ 14mm

If the motor shaft diameter is known from the motor datasheet, it can be specified directly.

What Korea Ever-Power Confirms

From your motor model number: output shaft diameter, shaft length to first feature (keyway or shoulder), and shaft tolerance class (h6, k6, etc.). Korea Ever-Power checks these against the FADS bore specification for the selected frame size — bore diameter, bore depth, and clamp mechanism compatibility — and confirms the FADS specification is achievable, or advises on the closest compatible frame size if not.

Lead Time for FADS

Standard EP-FADS frame sizes (047, 060, 090, 110 mm) in catalogue ratios and grades are typically available from stock or with 5–10 day production lead time — the same as EP-FAD. The motor shaft confirmation adds 1 business day for standard motor models. Custom bore diameters outside the catalogue range may require 2–3 weeks additional lead time. Confirm lead time at order for critical-path design projects.

Documentation for Medical / Cleanroom

For ISO Class 5 cleanroom or surgical robot applications: Korea Ever-Power provides per-unit backlash certificate, IP65 pressure test record, particle emission validation data (for NYOGEL 792D sealed in FADS housing), and RoHS declaration. For MRI-guided robots: aluminium housing material declaration. All documentation available within 5 business days of order confirmation — contact [email protected].

Quick Decision — FAD or FADS?

Axial constrained?Yes → FADS | No → Continue

Cleanroom/sterile?Yes (ISO 5 / OR) → FADS | No → Continue

Neither above?→ FAD (simpler ordering, C1–C10 adapter, no shaft ∅ confirmation required)

Unsure?Send application description to [email protected] — Korea Ever-Power recommends FAD or FADS within 1 business day.

Related EP-Series and Technical Guides

Korea Ever-Power EP series product range showing EP-FAD and EP-FADS direct-insert series alongside FAB FAL FALR FPG planetary gearboxes

EP-FADS and EP-FAD are the two configurations of the same round-flange precision planetary series. For the highest-precision applications requiring the extra torsional stiffness and output torque of the square-flange design, see EP-FAB (inline) and EP-FABR (right-angle). For belt-drive applications combining gearbox and integrated pulley, see EP-FAL and EP-FALR. Browse the full EP series catalogue. For related drive shaft components: cvjointdriveshaft.com. For worm reducer context: worm-reducers.xyz.

Frequently Asked Questions — EP-FADS vs EP-FAD

Is EP-FADS a different gearbox from EP-FAD, or the same gearbox with a different input?＋

EP-FADS is the same gearbox as EP-FAD with a different motor input interface — not a separate product line. The internal planetary gear train, ring gear, planet gears, sun gear, output shaft, housing body, IP65 sealing system, and NYOGEL 792D lubrication are identical. The frame sizes, gear ratios, backlash grades, and design life are identical. The only difference is that the EP-FAD input end uses the C1–C10 adapter ring system (a separate aluminium plate with pilot bore and bolt pattern), while the EP-FADS input end has a machined bore that accepts the motor shaft directly. This distinction means that EP-FADS and EP-FAD can be mixed on the same machine (different axes using different input configurations) with the same procurement and documentation approach — they are from the same product family with the same quality standards and test procedures applied to every unit.

Can I retrofit an EP-FAD axis to EP-FADS without changing any other part of the machine?＋

In most cases, the retrofit from EP-FAD to EP-FADS requires only changing the gearbox — the motor, output coupling, mounting bracket, and servo parameters remain unchanged. The gearbox body dimensions (output shaft diameter and length, housing outer diameter, mounting hole pattern) are identical between FAD and FADS at the same frame size and ratio. The key difference in the retrofit is the motor-input connection: the C-code adapter ring is removed (it is no longer needed), and the motor output shaft is inserted directly into the FADS bore. Confirm that the existing motor shaft diameter is compatible with the FADS bore specification for your frame size before proceeding. If the motor shaft is at the upper end of the compatible range, Korea Ever-Power can confirm whether a bore tolerance adjustment is needed. The retrofit does not require servo re-tuning — backlash compensation values should be updated if the new FADS unit has a different measured backlash from the replaced FAD unit (check the nameplate stamp on both units).

Why is the 22mm specifically stated, rather than “approximately 15–25mm”?＋

The 22 mm figure cited across Korea Ever-Power’s application guides is the axial savings measured for the most commonly specified frame size combinations — specifically the 047–090 mm frame sizes with C3 and C5 adapter rings, which are the configurations most frequently used in the surgical robot and cleanroom automation applications where the saving matters. The actual saving varies by frame size and C-code: smaller frames with C1/C2 codes may save 15–18 mm; larger frames with C6/C7 codes may save 20–25 mm. The 22 mm value cited is the typical saving for the middle-weight configuration (090 mm frame, C3 or C5 adapter) that is representative of the application where the saving is most decision-relevant. For a specific motor and frame size, Korea Ever-Power provides the exact dimensional comparison (FAD + adapter axial length vs FADS axial length) from the product drawings. Dimensions on this page are representative estimates for illustrative purposes.

Does EP-FADS support the same motor brands as EP-FAD’s C1–C10 system?＋

Yes — EP-FADS is compatible with the same servo motor brands and models that EP-FAD accommodates through the C1–C10 system, because the FADS bore diameter specification covers the shaft diameters used by all major servo motor manufacturers in the relevant power range. The difference is how compatibility is confirmed: for EP-FAD, the C-code defines the pilot diameter and bolt circle (motor-facing interface); for EP-FADS, the motor output shaft diameter must fall within the FADS bore range. For the most common servo motor brands (Siemens 1FK7, Yaskawa SGMJV, Mitsubishi HG-KN/HG-MR, Panasonic MSMF, Fanuc beta/alpha), all shaft diameters in the 047–090 mm EP-FADS frame size range are covered. Send your motor model number to [email protected] and Korea Ever-Power will confirm FADS bore compatibility within one business day.

Is there a price difference between EP-FAD and EP-FADS at the same specification?＋

The gearbox body price is equivalent between EP-FAD and EP-FADS at the same frame size, ratio, and backlash grade — both require the same gear train, housing, sealing, and testing operations. The difference in acquisition cost is the adapter ring: EP-FAD requires a C-code adapter ring (a separately priced catalogue item) that is not needed for EP-FADS. In most cases, the total acquisition cost of EP-FADS is slightly lower than EP-FAD at equivalent specification because the adapter ring cost is eliminated. This is an incidental economic advantage — Korea Ever-Power does not position FADS as a cost-saving option, but rather as the correct technical choice when axial space or cleanability requirements apply. For standard industrial applications where neither constraint exists, EP-FAD with adapter ring is the recommended choice for its procurement simplicity, even though the total cost may be marginally higher.

Confirm FAD or FADS for Your Application

Send your application description, available axial space at the motor input end, deployment environment (cleanroom class if applicable), and motor model — Korea Ever-Power will confirm whether EP-FAD or EP-FADS is the correct specification within one business day, provide dimensional drawings for comparison if needed, and supply the shaft diameter compatibility confirmation for FADS if required. For projects in early design phase where motor selection is not yet finalised, Korea Ever-Power can provide a bore range recommendation that covers the likely motor shortlist.

Confirm FAD or FADS Specification →

Editor: Cxm

VR Tour of Our Factory

TAGs: