Is Your Machine Losing Precision? Stop the Vibration and Backlash Now
You run a cable production line. You need every millimeter to be perfect. But your machine shakes. The motor heats up. The cable cuts are not straight. You check the coupling, and it is loose. Or maybe it is too stiff and breaks the shaft. This is a common problem in factories using cheap rubber couplings or old rigid joints. They wear out fast. They have “play” (backlash). They cannot handle high speed. When your lead screw or slide table moves, it jerks instead of gliding. This ruins your product and stops your line. You need a part that connects the motor to the screw without slipping. You need zero backlash. You need high stiffness. You need the Miki Pulley SFC-030DA2.
What Makes the SFC-030DA2 Special?
This is not a standard rubber spider coupling. This is a metal diaphragm coupling. Miki Pulley builds this for high-speed servo motors. The “SFC” stands for Servo Flex Coupling. The “DA2” means it is a double element type. This gives it flexibility but keeps it very strong. The material is high-strength aluminum alloy. This makes it very light. Light parts mean low inertia. When inertia is low, the motor can start and stop very fast. This is crucial for cable stripping or cutting machines that need to change direction quickly. There is no backlash. The metal plates spring back to the center perfectly. Your machine will repeat the same move 10,000 times without error.
Technical Specifications You Need to Know
Let’s look at the hard numbers. This helps you decide if it fits your machine.
Size and Dimensions
- Model: SFC-030DA2
- Outer Diameter: 34 mm
- Length: 37.8 mm
- Weight: About 70 grams (0.07 kg)
- Bore Sizes: We are looking at the 11mm to 11mm version (often noted as 11-11). It fits shafts from 5mm to 10mm, but we machine it for 11mm specific applications.
- Clamp Type: It uses a clamp hub (set screw free). This means it grips the shaft evenly. No scratching. No loose screws.
Performance Data
- Rated Torque: 5 N·m. This is strong enough for small to medium servo motors.
- Max Torque: It can handle short spikes up to 15 N·m without breaking.
- Max Speed: 10,000 RPM. This is very fast. Most cable machines run under 3000 RPM, so this gives you a huge safety margin.
- Torsional Stiffness: 4000 N·m/rad. This number is high. It means the coupling does not twist under load. If you twist one side, the other side moves instantly.
- Moment of Inertia: Very low (around 7.43 x 10^-6 kg·m²). This saves energy and improves response time.
Misalignment Tolerance
Your machine is never perfectly aligned. Shafts move when they get hot. The SFC-030DA2 fixes this:
- Parallel offset: Up to 0.18 mm
- Angular offset: Up to 1 degree
- Axial movement: Up to ±0.4 mmThis flexibility protects your expensive motor bearings and the lead screw nut.
Perfect for Lead Screws and Slide Tables
You asked about “motor lead screw” and “slide table.” This is where this coupling shines. In a linear actuator system, the motor turns the screw. The nut moves the table. If the coupling is soft, the table will wobble. If it is too hard, it will bind. The SFC-030DA2 acts like a stiff spring. It absorbs the tiny vibrations from the motor. This makes the slide table move smoothly. You get a better surface finish on your cable products. It also dampens resonance. Stepper motors often vibrate at certain speeds. This coupling stops that noise. It keeps the lead screw turning evenly.
Easy Installation and Maintenance
You do not need a specialist to install this. The clamp hub design is simple. You loosen the screws, slide the coupling onto the shaft, and tighten them. The diaphragm is one piece of metal. It does not wear out like rubber. You do not need to grease it. It is maintenance-free. This is great for clean rooms or dusty factory floors. If you work with food or medical cables, they make clean-room versions (ISO Class 6). This ensures no dust or oil leaks onto your product.
Why Choose Miki Pulley?
Miki Pulley is a Japanese manufacturer. They are famous for quality. You pay for precision. Cheap couplings from generic brands might last 6 months. A genuine Miki Pulley coupling can last 5 years or more in a normal factory setting. The aluminum alloy hub is anodized. It resists corrosion. The diaphragm is fatigue-tested for millions of cycles. When you buy this, you are buying peace of mind. You know your machine will not stop unexpectedly.
How to Order and Custom Options
We stock the SFC-030DA2 series. The “11-11” bore is a common request for 400W to 750W servo motors. We can also supply:
- Type A: Standard length for general use.
- Type B/C: Different lengths for specific motor frames.
- Keyway versions: If you do not use clamp hubs, we can add a keyway (but clamp is better for high speed).
- Stainless Steel: For washdown environments.
Summary of Benefits for Your Business
- Zero Backlash: Perfect positioning accuracy for cutting cables.
- High Rigidity: No lost motion between motor and load.
- Vibration Damping: Quieter machines, longer tool life.
- Lightweight: Faster acceleration, higher throughput.
- Compact: Fits in tight spaces on your slide tables.
Get Your Quote Today
Do not let a bad coupling ruin your production run. If you are using servo motors with lead screws or ball screws, you need the SFC-030DA2. It is the industry standard for precision motion control. We have the PDF catalogs and CAD drawings ready. We can ship to your factory in 3-5 days. Send us your inquiry now. Tell us your motor shaft size and the torque you need. We will confirm the price and availability immediately. Upgrade your machine today.