SIG | Precision Vision Measuring Machine – The Professional Choice for Watch Parts Inspection

In watchmaking, dimensional deviations at the millimeter or even micron level can directly affect timekeeping accuracy, water resistance, and assembly quality. Traditional calipers, projectors, and manual visual inspection can no longer meet the dual demands of precision and efficiency in modern watch production. SIG offers an optical dimension measurement solution centered on high-precision Vision Measuring Machines (OMMs), providing a one-stop solution for geometric dimension measurement of watch components.

1. Watch Parts Inspection: The Micron-Level Accuracy Challenge

A watch consists of hundreds of precision parts – cases, dials, hands, movement gears, escape wheels, strap buckles, etc. The dimensional tolerance of each part directly impacts final product quality. For example, the concentricity of a case aperture must be controlled within ±5μm, gear modules can be as small as 0.1mm, and the line width error of dial printing may be less than 0.01mm. Any deviation in inspection can compromise assembly fit, cause timing errors, or even lead to complete scrapping.

Traditional inspection methods face three major difficulties:

• Calipers and projectors are prone to operator error and low efficiency.
• Contact measurement easily scratches fragile parts such as ceramic bezels and thin-walled gears.
• Micro features (micro-holes, gear tooth profiles) are difficult to see or measure accurately, with no data traceability for batch production.

2. What Can SIG’s Vision Measuring Machine Measure?

SIG’s fully automatic Video Measuring System integrates a high-resolution industrial camera, telecentric optical system, and intelligent edge-detection algorithm to enable non-contact, fast, and repeatable optical dimension measurement, covering all types of watch components.

2.1 Watch Cases & External Structural Parts

The case is the "skeleton" of a watch; its accuracy determines assembly quality. SIG’s OMM accurately measures case flatness, aperture concentricity, thread depth, step height, and sealing groove width. For smartwatch ceramic cases, the device provides precise aperture position data to ensure alignment of the heart rate sensor window. For precision ceramic parts, the Vision Measuring Machine clearly images micro-holes and groove widths at millimeter or micron levels, eliminating human error.

2.2 Dials & Hands

The printing accuracy of dial markings and hand dimensions directly affect aesthetics and functionality. SIG’s Video Measuring Machine measures the width and position of dial graduation lines, dial outer diameter, hand length, width, straightness, and other geometric tolerances. For tiny hands (some dimensions only 0.01mm), the system uses high-magnification optics and intelligent edge detection to rapidly perform batch inspections, avoiding reading errors or hand jamming.

2.3 Movement Gears & Escape Wheels

The movement is the heart of a watch; gear system accuracy determines timekeeping stability. SIG’s Vision Measuring Machine precisely measures gear module, tooth profile, pitch error, and coaxiality. The system supports high-power objectives to capture the micro-profile of gear meshing surfaces, and the software algorithm automatically calculates pitch error to ensure movement transmission accuracy. For escape wheels (typical precision micro-mechanical parts), the OMM automatically measures and sorts central aperture, outer diameter, and other parameters.

2.4 Strap Buckles & Connectors

Concentricity deviation of strap holes affects assembly fit and wearing comfort. SIG combines optical imaging with image processing to accurately measure strap hole concentricity, supporting non-contact inspection of leather, silicone, and metal materials. For stainless steel buckle parts and spring bars, the machine also performs high-precision measurement of contour dimensions, roundness, and flatness.

3. What Core Problems Does It Solve?

Problem 1: Contact measurement deforms parts.
Watch parts are often thin-walled, micro-sized structures. Contact probes can easily scratch or deform them. SIG adopts non-contact optical measurement, completely avoiding physical contact – non-destructive inspection even for fragile parts like ceramic bezels and thin-walled gears.

Problem 2: High-reflection and black parts are difficult to image.
High-reflection metal cases and light-absorbing black plastic bezels challenge traditional optics. SIG configures a programmable 5-ring 8-zone LED cold light source and coaxial light system. By intelligently adjusting multiple light combinations, it obtains high-contrast images even for highly reflective or absorbent materials, clearly capturing edge details down to 0.01mm.

Problem 3: Low batch inspection efficiency and human error.
Manual point-by-point measurement is slow and inconsistent. SIG’s fully automatic Vision Measuring Machine features CNC control – operators simply press “start,” and the machine automatically performs batch measurement along a preset path. Single-part inspection time is reduced to seconds. Measurement results are automatically compiled into SPC statistical reports, monitoring process capability in real time and warning of potential batch defects early.

Problem 4: Data traceability is lacking for continuous improvement.
Traditional paper records cannot meet quality system traceability requirements. SIG equipment automatically exports reports in Word, Excel, PDF, and CAD formats. Measurement data is stored in real time with automatic CPK calculation, providing true data support for mold wear analysis and process parameter optimization.

4. Sinowon Product Matrix & Application Solutions

Sinowon offers a complete product line from manual entry-level to fully automatic composite inspection. The fully automatic Vision Measuring Machine (MVS series) is developed specifically for GD&T geometric dimension measurement, with three-axis automatic control and XYZ accuracy up to ±1.5μm, ideal for batch inspection of watch parts. The iVS Series Snap-Shot OMM uses a telecentric lens with high depth of field and low distortion – it images the entire field of view without moving the stage, particularly suitable for rapid batch measurement of miniature watch parts. The Video Projector is ideal for batch screening and fast verification of complex contour shapes, improving production line efficiency.

Whether for traditional mechanical watches or smart wearables, Sinowon provides a full-process geometric dimension measurement solution – from incoming material inspection and in-process control to final output. For example, an Australian watch parts manufacturer adopted Sinowon’s iMS-1010B Vision Measuring Machine and achieved measurement accuracy within 2μm under specific test conditions, greatly improving inspection efficiency and product quality stability.

As precision manufacturing moves toward intelligence, Sinowon continues to drive innovation in optical dimension measurement technology. With the professional capability to “measure accurately, measure fast, and measure repeatably,” we help watch manufacturers achieve higher quality standards.

For more product details or a free sample testing service, please visit our official website: www.sinowon.com or call +86-769-23184144.