5mm to M10 Shaft Adapter - 775 Motor Grinder & Saw Blade Stud

Prototyping and Engineering Tips from Robogears

• Reducing Vibration: CRITICAL: To achieve a "true" spin with zero wobble, ensure the motor shaft is clean and free of burrs. Tighten the two grub screws incrementally—turn the first one slightly, then the second, then back to the first—to center the adapter perfectly on the shaft.

• The Flat-Spot Hack: If your 775 motor shaft is perfectly round, use a small metal file or a Dremel to create a tiny "flat spot" where the grub screws sit. This provides a "mechanical shoulder" that prevents the adapter from flying off if the screws loosen over time.

• Thrust Bearing Care: 775 motors are powerful but not always designed for heavy "axial" (pushing) loads. When using a saw blade with this adapter, try to avoid pushing too hard against the motor. If your project requires heavy pressure, consider adding an external bearing block to support the shaft.

• Thread Direction Awareness: Standard M10 threads are right-handed. If your motor rotates counter-clockwise (CCW) while cutting, the resistance may actually loosen the nut. Always ensure your motor rotation direction "tightens" the nut against the blade during operation.

• Safety Housing: Never operate a 775 motor with a saw blade or grinder disc attached without a protective guard. These motors can reach 15,000+ RPM; a shattering disc or a loose adapter at these speeds is extremely dangerous. Use a 12V 10A to 20A Power Supply for consistent torque.

Package Includes

• 1 x 5mm Shaft Adapter Stud (M10 Thread)

• 2 x M4 Grub Screws

• 1 x Matching Allen Key

• 2 x Flange Nuts (Inner & Outer)

Disclaimer: This adapter is intended for DIY prototyping and light-duty hobbyist use. Always wear safety goggles and gloves when operating high-speed rotating machinery. Ensure all screws and nuts are fully tightened before applying power. Not recommended for industrial-scale heavy milling or high-precision lathe work.