Polishing Machine for Jewelry CF series Centrifugal disc finishing machine is a zero gap high energy mass finishing machine. It is suitable for small components especially very thin components deburring and polishing.
Inovatec Machinery · Vibratory Finishing
Inovatec’s polishing machines for jewelry deliver smooth surface finishes, fast deburring, and consistent, reliable results in every batch. Below you’ll find real performance data and before-and-after comparisons from our industrial customers.
Before AfterProcess Specs
Parts Material | Processing time (min) | Media Type | Media Wear Rate | Ra before | Ra after | Material Removal | Consistency | |
Gold | 60 minutes | Plastic media 2000# cone 2 hours Walnut shell 24# 1 hours dry processing | 0.3% per hour | 0.8 | 0.1 | < 0.2% | ±1% Surface Uniformity |
Consistent Results: The CF series centrifugal disc polishing machine for jewelry delivers uniform surface finish quality in every batch, ensuring stable and reliable results for jewelry production.
Low Damage Rate: With controlled high-energy disc motion and properly matched media, the CF series centrifugal disc polishing machine for jewelry reduces part-to-part contact and helps protect delicate rings, pendants, and small components.
High Repeatability: Digital controls and easy program settings help the CF series centrifugal disc polishing machine for jewelry maintain cycle-to-cycle consistency, typically within ±1% under the same processing conditions.
Real Industrial Testing: The CF series centrifugal disc polishing machine for jewelry is proven by 1,000+ finishing tests on silver, brass, stainless steel jewelry, and complex shapes.
Process Tracking: Each CF series centrifugal disc polishing machine for jewelry can record cycle time, media type, and key process parameters to simplify quality control and ensure repeatable polishing results.
Detailed specifications for our CF Series jewelry polishing machines. Compare models and download comprehensive technical documentation.
| Model | Capacity | Chamber diameter | Dimension | Weight | Power |
| (L) | (mm) | (mm) | (kg) | (KW) | |
| CF20 | 20 | 333 | 880x1000x1620 | 127 | 1.1/1.5 |
| CF50 | 50 | 485 | 1457x2000x2300 | 550 | 2.2/3.0 |
The CF series is a zero-gap centrifugal disc finishing machine developed specifically for jewelry — the zero-gap design is what makes it usable for very thin punched parts and fine jewelry that would lodge in the standard gap found in conventional centrifugal disc machines. Three hardware decisions underpin the CF series’ suitability for jewelry production.
Conventional centrifugal disc machines have a gap between the rotating disc and the fixed bowl wall — typically 1–3 mm. Thin punched parts (earring blanks, pendant stampings, chain links) can lodge in this gap during the cycle, causing part damage and machine jams. The CF series eliminates this gap: the upper ring fits flush against the disc at all operating speeds, leaving no space for parts to enter. This makes the CF20 and CF50 the only centrifugal disc machines in the Inovatec range safe for finishing thin-section jewelry parts without lodging risk.
The CF series uses a Nord motor (Germany), Siemens PLC touch screen and ProMinent dosing pump as standard components. The Siemens PLC stores up to 50 process programs for different jewelry types (gold rings, silver pendants, brass chains), allowing the operator to select a program and start rather than re-enter parameters. The ProMinent dosing pump delivers precise compound and water volume each cycle, ensuring consistent compound concentration and repeatable surface quality across production batches.
The CF series is available in two bowl sizes. CF20 (20 L, 333 mm chamber diameter) is the standard choice for jewelry workshops processing small batches — rings, earrings, pendants — where the 20 L capacity is sufficient for daily production and the compact 880×1000×1620 mm footprint fits in a small workshop. CF50 (50 L, 485 mm chamber diameter) is the production-scale model for jewelry manufacturers with higher daily volume, handling larger batches of mixed jewelry types in fewer cycles.
CF50 centrifugal disc finishing machine
A wide range of workpieces—such as stampings, machined parts, castings, and jewelry—can be finished in this machine. The CF20 and CF50 disc tumbling machines feature a unique design that we have developed and refined over many years. As a result, even very thin punched parts won’t get trapped in gaps or hang on the bowl wall. This user-friendly advantage is a key reason why the CF series is so popular with our customers.
Feature:
Application:
Watch our Surface finishing process in action. Learn more about our Surface finishing process technology.
Our mass finishing machine and tumbling media serve diverse industries with specialized finishing solutions for various materials and part types.
Engine components, transmission parts, brake systems
Turbine blades, landing gear, structural components
Fasteners, connectors, precision tools
Post-processing, surface refinement, finishing
Inovatec Machinery stands out as a trusted partner in surface finishing solutions, offering unmatched quality, innovation, and customer support.
Since 2003, we've been at the forefront of surface finishing technology, continuously innovating and improving our solutions based on real-world manufacturing needs.
We understand that every application is unique. Our engineering team works closely with you to design and configure machines that perfectly match your requirements.
With partners and service centers worldwide, we provide localized support and rapid response times regardless of your location.
We value your time. Our technical team responds to inquiries within 24 hours, ensuring you get the answers and support you need quickly.
Benefit from our expertise at no cost. We offer complimentary technical consultations to help you optimize your finishing processes and select the right equipment.
Over 500 satisfied customers across 50+ countries trust Inovatec for their surface finishing needs, with a 99% customer satisfaction rate.
Explore real applications by industry and scenario, with Before/After, sub‑categories and resources to help you quickly find what you need.
Jewelry | Precious Metals | Jewelry Polishing
Precision polishing, deburring and mirror finishing for gold, silver, copper and titanium jewelry—balancing premium surface quality with throughput.
Burrs on edges, surface scratches and oxidation spots reduce luster and wearing comfort.
Noticeably improved mirror gloss with rounded edges and better wearing comfort.
Additive Manufacturing | SLA/SLS/FDM
Removes layer lines, densifies surfaces and unifies appearance for 3D‑printed parts across materials and processes.
Pronounced layer lines, support marks and rough surface affect assembly and appearance.
Smooth, refined surface ready for painting/electroplating; presentation‑grade look.
Sheet Metal | Laser Cutting | Edge Optimization
Removes dross/burrs and adds edge radiusing on laser‑cut parts to improve safety and assembly quality.
Sharp, burred edges can cause cuts and hinder coating adhesion.
Consistent rounded edges and clean surfaces for better paint/e‑coat adhesion.
Consumer Electronics | Small Appliances | Exterior Parts
Delivers consistent texture and feel for high‑volume consumer products, improving brand perception and yields.
Uneven brushing, micro‑burrs and harsh feel affect assembly and user experience.
Uniform texture, smooth edges and refined touch; markedly better consistency.
Stone | Gemstone | Tumbling
Rounds edges and enhances gloss on natural/synthetic stones for jewelry and decorative crafts.
Sharp edges, rough surfaces and uneven color/reflection.
Rounded edges and even polish; improved visual appeal.
Automotive | Engine/Drivetrain | High‑volume Consistency
Deburring, edge radiusing and surface consistency for automotive parts to meet stringent standards.
Tool marks and residual burrs with sharp edges reduce fatigue strength and hinder assembly.
Stable edge radii and compliant roughness with high repeatability.
Defense | High Reliability | Process Consistency
High‑reliability, consistent surface finishing across metals and composites.
Sharp edges, stress concentrations and surface defects impact durability and safety.
Consistent chamfers and stable surface quality; coating/assembly‑ready.
Aluminum Profiles | Die‑cast Parts | High‑volume Finishing
Efficient, consistent finishing for aluminum parts; ideal for pre‑anodizing treatment and brushed/polished appearance.
Gate/flash marks and dull surfaces; notable batch variation.
Flash removed with refined texture and higher brightness; improved batch consistency.
Engineering Plastics | Injection‑molded Parts | Deflashing
Removes plastic flash and smooths edges to prevent scratching and improve assembly.
Visible flash and sharp edges affect feel and assembly.
Flash removed and corners smoothed; improved look and feel.
Enhance your mass finishing machine and tumbling media with our professional-grade accessories. Increase efficiency, reduce noise, and optimize your finishing process.
Get the most out of your mass finishing machine and tumbling media with our comprehensive accessory package. Our experts will help you select the right combination of accessories for your specific application needs.
Accessories designed to maximize machine efficiency and output quality
Reduce operational costs through improved efficiency and reduced waste
All accessories designed for seamless integration with your existing machine
Inovatec Machinery is committed to the highest standards of quality, safety, and reliability.
Quality Management System certified by international standards, ensuring consistent product quality.
European Conformity marking ensuring our machines meet EU safety standards.
Comprehensive testing and inspection reports from SGS.
Environmental protection standards compliance.
Since 2003, Inovatec Machinery has been at the forefront of surface finishing technology innovation.
Our machines are trusted by manufacturers worldwide and recognized at major industry exhibitions.
Regular participation in major industry exhibitions worldwide.
Strategic partnerships across major manufacturing regions.
Find answers to common questions about our products.
The CF Series is specially designed for high-precision finishing of fine jewelry and is ideal for:
Precious metals: gold, platinum, 925 silver, and stainless-steel jewelry
Jewelry items: rings, earrings, pendants, charms, and small carved pieces
Plated accessories: gold-plated or silver-plated copper components
Small precision parts: watch components and small mechanical parts
It’s especially effective for achieving a mirror-like, high-gloss finish.
| Stage | Material / Typical Parts | Goal | Media | Compound / Additive | Machine / Speed | Time | Notes |
|---|---|---|---|---|---|---|---|
| 1) Heavy deburring | Jewelry castings / stampings (metal parts) | Remove burrs, level edges | Ceramic media | LC-13 compound | Wet finishing (vibratory / centrifugal disc) | ~1 hour | Best for “hard burr” removal; rinse after cycle |
| 2) Light deburring / pre-polish | After Stage 1 | Smooth surface, reduce scratches | Plastic media 1000#–2000# | LC-13 compound | Wet finishing (vibratory / centrifugal disc) | ~2 hours | Use finer grade for brighter surface; rinse & dry before final stage |
| 3) Final mirror polishing (dry) | After Stage 2 (fully clean & dry) | Mirror-like high gloss | Walnut shell | HM-P polishing paste | Dry centrifugal disc (CF20) | ~2 hours | Ensure parts are dry/clean to avoid paste contamination; separate and blow off dust after cycle |
Results depend on part material/geometry and load size. We recommend a small trial run to confirm the best media size, ratio, and cycle time.
For best performance, we recommend the following media and compounds:
Stainless steel pins or balls – for high-impact polishing and burnishing
Ceramic media – for fine deburring and brightening
Plastic triangular media – for pre-polishing or delicate surface smoothing
Liquid compounds – such as stainless steel brightener, jewelry polishing solution, degreasers, and water-based cleaning agents
For consistent, high-quality results, it’s best to run the process in stages: Cutting → Smoothing → Final Polishing.
The CF Series uses centrifugal force generated by a rotating inner barrel to accelerate both the media and workpieces. This creates high-energy, controlled sliding action that quickly refines surfaces for deburring, smoothing, and polishing.
Key advantages
3–5× faster finishing speed than traditional tumblers
Can achieve a mirror-like finish on jewelry items
Gentle on edges and details, ideal for intricate pieces
Variable speed, timer control, and a user-friendly control panel
1. Drum not rotating
Possible causes: Media is lodged in the gap; the upper ring is worn.
Solutions: Unscrew/remove the barrel and clean the gap thoroughly. If the upper ring is worn, replace it immediately.
2. Poor polishing results
Possible causes: Media is worn out; compound concentration/dosage is too low.
Solutions: Replace the media and increase/adjust the compound concentration or dosage.
3. Unusual noise during operation
Possible causes: Bearings are worn; internal components or fasteners are loose.
Solutions: Replace the bearings and tighten any loose bolts/screws. Inspect the machine for vibration sources.
4. Water overflow during operation
Possible causes: Faulty water inlet valve; water level set too high / tank overfilled.
Solutions: Lower/adjust the water level and inspect the inlet valve. Repair or replace the valve if needed.
CF vs VA series: both are centrifugal disc machines suitable for jewelry. The VA series has a small gap (0.05–0.1 mm) that handles most thin jewelry but may not be suitable for the thinnest punched parts (below 0.5 mm). CF series has zero gap — the safest option for the thinnest earring and pendant stampings. If your thinnest parts are above 0.8–1 mm, the VA series is a good alternative at comparable cost.
CF vs vibratory finisher: the CF series runs 3–5× faster than a vibratory bowl for jewelry finishing. If your cycle time with vibratory is 3–4 hours, the CF series typically reduces this to 60–90 minutes. Choose vibratory finishing when batch volume is very high or when you are processing non-jewelry parts alongside jewelry in the same machine.
CF vs magnetic tumbler: the magnetic tumbler is faster for the initial oxide removal and brightening stage (5–30 minutes). For final mirror polishing, the CF series with fine plastic media and walnut shell dry finish produces higher surface quality. The optimal sequence is: magnetic tumbler (oxide removal) → wet finishing in CF series (surface smoothing) → dry CF finishing with walnut shell (final brightness).
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