Choosing Between the CRA-300 and CRA-800 Forming Machines
The CRA-300 forms airway buffs with outer diameters from 100 mm to 250 mm. It is designed for small to medium wheels used in jewellery polishing, bench work and light industrial applications. The CRA-800 covers a larger range, from 200 mm to 600 mm outer diameter. It is built for production wheels...
Machine Size And Wheel Diameter Range
The CRA-300 forms airway buffs with outer diameters from 100 mm to 250 mm. It is designed for small to medium wheels used in jewellery polishing, bench work and light industrial applications.
The CRA-800 covers a larger range, from 200 mm to 600 mm outer diameter. It is built for production wheels used in cookware, sanitary ware and sheet metal polishing lines where higher throughput and larger size are required.
Power And Physical Specifications
Both machines run on 380 V three phase four wire power. The CRA-800 consumes 6 kW. The CRA-300 has a lower power draw, but the exact value is not specified in the source.
The CRA-800 measures 2.8 m long by 1.8 m wide by 1.6 m high. The CRA-300 has a smaller footprint, but exact dimensions are not provided.
Pressure And Output Capacity
Both machines apply moulding and finishing pressure at 7 MPa. This pressure is critical to maintain consistent ply density and prevent soft running wheels.
The CRA-800 is rated for up to 5000 pieces per day under maximum output conditions. The CRA-300’s daily output is not specified in the source.
Material Compatibility
Both machines accept treated fabric in soft or hardened grades, as well as sisal cloth. The choice depends on the wear resistance and finish required for the final wheel.
The CRA-360 corrugated buffs machine is not part of this comparison, as it produces a different wheel structure with a corrugated weave pattern.
Operator And Line Integration
Each forming machine operates with one operator. The number of machines in a line depends on the required output and wheel size mix.
The CRA-800 is suited for high-volume production lines. The CRA-300 fits smaller operations or shops with limited space and lower output needs.
Questions On This Topic
Which machine is best for jewellery polishing wheels?
The CRA-300 covers 100 to 250 mm, which matches the size range used in jewellery polishing.
Can the CRA-800 make wheels smaller than 200 mm?
No. The CRA-800 is designed for 200 to 600 mm. For wheels below 200 mm, use the CRA-300.
What power supply do both machines need?
Both run on 380 V three phase four wire. The CRA-800 uses 6 kW; the CRA-300’s power draw is not specified.
Do both machines use the same pressure setting?
Yes. Both apply moulding and finishing pressure at 7 MPa to ensure consistent ply density.
Can I use the same machine for both fabric and sisal?
Yes. Both the CRA-300 and CRA-800 accept soft or hardened treated fabric and sisal cloth.
Products Mentioned Here
CRA-360 Airflow Buffs/Corrugated Polishing Buffs Making Machine
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CRA-300 Airway Buffs Ventilated Buffs Forming Iris Machine (OD 100-250 mm)
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CRA-800 Bias Airway Buffs Ventilated Sisal Buffs Forming Machine (OD 200-600 mm)
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Send us the wheel or the cut you need to produce and we will tell you which model covers it, and which one does not.