1. Where VC, VF and VGTH Sit in the Product Map

From W-Robot’s product tree, the positioning is roughly: W-Robot+1

VC Series – “Anti Torsion, Heavy Load” ball screw linear modules. Cross-sections and bearings are reinforced for high rigidity, especially for side-mounted payloads. Good match for clean or semi-clean environments such as battery, semiconductor and 3C assembly lines. 

VF Series – “Anti Torsion, Complete Specifications.” A broad ladder from VF6 up to VF27 with strokes up to around 1200 mm, covering many linear module for automation tasks where you need both load capacity and longer travel. W-Robot+1

VGTH Series – “Easy Installation, New Arrivals,” but under the hood it is W-Robot’s fully enclosed linear module line: integrated linear bearings plus sealed covers so the screw and guides are protected from metal dust, oil mist and other contamination. Shenzhen W-robot Industry Co., Ltd.+2

All three are built as servo motor linear modules by default, but can also be combined with stepper motors or integrated motor-and-driver units depending on your motion controller and budget.

2. VC Series – For Maximum Rigidity in Compact, Clean Installations

If your first concern is stiffness under heavy, off-centre loads, start by looking at the VC series.

2.1 Structural focus

Public descriptions of VC highlight: 

“Strong deformation resistance for side-mounted payload”

High-rigidity body with integrated linear bearings

Size range VC6, VC8, VC10, VC12, VC14, VC17, VC22

In practice, that means VC is a good fit when:

The carriage supports a tall fixture, robot gripper or electric cylinder

You mount the heavy load linear module vertically or sideways on a frame

You want a compact yet stiff axis in an XYZ linear module platform, 2-axis gantry stage or multi-axis linear actuator system

2.2 Typical use cases

Battery and EV lines – lifting or positioning heavy modules in a linear actuator for battery production line

Semiconductor and 3C electronics – short to medium strokes where high rigidity and low deflection are important for precision tools or inspection heads (for example, a linear module for semiconductor equipment under a vision system)

Cleanroom or low-contamination environments – VC is also marketed in a cleanroom version, so if you need a stiff axis inside a clean enclosure, VC is usually preferred over open VF. 

If stroke is not extremely long and environment is relatively clean, VC often becomes the default choice for a high rigidity linear stage.

3. VF Series – Heavy Loads plus Longer Travel and Size Options

Where VC emphasises stiffness in compact frames, VF series provides a broad range of sizes and longer strokes.

3.1 What makes VF different

From the VF tag page we see: VF6 modules reach strokes up to about 1200 mm with 60 mm body width, and the series scales up through VF8, VF10, VF12, VF14, VF17, VF22 and VF27. W-Robot+1

Key implications:

More stroke options: suitable for gantries and transfer axes where travel exceeds what VC or VGTH typically offer.

Complete specifications: multiple body widths and screw leads, making it easier to do precise linear actuator sizing from light to heavy payloads.

3.2 Where VF fits best

Choose VF when you need:

A heavy load linear module that travels 600–1200 mm along a beam, for example in:

pallet transfer

mid-range linear module for photovoltaic production line

X-axis of an 3-axis linear motion system with long stroke

A standardised family that you can reuse across different machines—VF’s wide size ladder is helpful if you want the same mechanical concept on several payload levels.

Good stiffness, but your environment is not extremely dusty or oily (for harsh environments you’d move towards VGTH).

VF is common in linear module for automation projects where you combine it with vertical electric cylinders or Z-axes, building multi-axis structures that carry sizeable jigs and fixtures.

4. VGTH Series – Heavy-Load, Fully Enclosed for Tough or Clean Environments

When the environment becomes the bottleneck—oil mist, fine powder, aluminium chips or strict cleanliness—the VGTH series is usually the right answer.

4.1 Enclosed design

According to W-Robot’s own blog, VGTH is not just a standard axis with a cover added: it is a redesigned structure where sealing and precision are engineered together. 

Characteristics:

Built-in enclosure around the ball screw drive and linear guide rail

Available in variants VGTH4, VGTH5, VGTH8, VGTH12, VGTH15, VGTH20 etc. 

Designed to act as a dustproof linear module and, in clean environments, as a cleanroom linear module with minimal particle generation

In other words, VGTH is W-Robot’s IP-rated linear actuator family for ball-screw-based systems.

4.2 Where VGTH makes sense

Machining, welding and cutting stations – chips, dust and welding fumes would quickly damage an open VF or VC; VGTH’s sealed covers protect the screw and guides.

Precision assembly in controlled environments – bonding, imaging or inspection stations where you want the benefits of a fully enclosed linear module even inside a cleanroom. 

Production lines for batteries, PV and medical devices – many customers use VGTH as the main axis in linear actuator for medical device automation, linear module for photovoltaic production line or cell handling, where contamination control is critical.

VGTH will usually be a little larger and heavier than an open VF or VC of the same load class, but the trade-off is better protection and longer life in harsh conditions.

5. Five Parameters to Compare When Choosing Between VC, VF and VGTH

Instead of guessing, you can use a simple five-point checklist.

5.1 Load and moments

If your main concern is rigidity under high side-loads or tall fixtures, VC or the larger VF sizes are your primary candidates.

Use VC when the axis is compact but sees strong side loads (for example, a vertical stage carrying a large robot gripper).

Use VF when you need similar load capability over longer strokes.

5.2 Stroke length

Up to ~600 mm: all three families are options; pick based on rigidity and environment.

600–1200 mm: VF is usually more appropriate; this is where its “complete specifications” shine.

Very short strokes but dirty environments: VGTH gives you enclosure plus heavy-load capability.

5.3 Environment and protection

Clean or mildly dusty → VC or VF (open body, easier to clean, compact).

Chips, oil, fine powder, or strict cleanliness rules → VGTH as your dustproof linear module / fully enclosed linear module.

If your machine requires formal IP-rated linear actuators, VGTH is normally the starting point, with extra covers or bellows around any auxiliary axes.

5.4 Integration into multi-axis systems

For a rigid XYZ linear module platform or 2-axis gantry stage, a common pattern is:

X/Y with VF or VC (depending on stroke)

Z with a VZ electric cylinder or a smaller VC/VF model

For lines with many identical cells, keeping one family (all VC or all VF) simplifies spares and troubleshooting linear actuator issues later.

5.5 Servo / stepper and control

All three series can be driven by:

Servo motors → for higher speed, better synchronisation and force control

Steppers → for lower-cost axes in non-critical stations

Integrated motor and driver packages → when cabinet space is tight

When you design your motion controller layout, check inertia ratios and speed targets; heavy-load axes often benefit from the torque reserve of a servo solution, especially in battery or PV lines where cycles run continuously.

6. Example Selection Scenarios

Scenario 1 – Heavy fixture on a short stroke, clean environment

Task: position a 40 kg fixture under a camera within 300 mm travel in a linear module for 3C electronics line.

Needs: high stiffness, minimal deflection, relatively clean environment.

Recommendation: VC series (for example VC12/VC14) as a high rigidity linear stage; pair with a servo motor for smooth motion.

Scenario 2 – Long travel gantry in a battery line

Task: X-axis for 900 mm travel, carrying a Z-axis with a gripper; used as a linear actuator for battery production line.

Needs: long stroke, heavy load, moderate contamination.

Recommendation: VF series (VF14 or above) for X; smaller VF/VC or electric cylinder for Z. This combination gives enough stiffness with the stroke flexibility VF provides.

Scenario 3 – Precision handling in a dusty welding cell

Task: move a welding sensor and small robot gripper over 400 mm in a cell where spatter and fumes are present.

Needs: contamination resistance, reliable stroke, good rigidity.

Recommendation: VGTH series in a size that matches the payload (for example VGTH8 or 12). Its enclosed design protects the ball screw and support bearings, reducing maintenance compared with open modules.

7. Quick Decision Table

If you keep this table in mind and always start from load/moments → stroke length → environment, choosing between VC, VF and VGTH becomes a structured engineering decision instead of guesswork.

From there, you can fine-tune screw leads, motor sizes and options such as linear actuator for pick and place tooling, custom linear actuator brackets or OEM combinations—while staying within one consistent ecosystem from a single linear module manufacturer.