Here's a product for the small combat robot with a spinning weapon. FingerTech's Blade Hub is the best way to attach a blade to a shaft. It uses a flange nut to hold the blade tightly, meaning you can use off-the-shelf sawblades without needing to drill screw holes into hardened steel! Custom blades can be made stronger by not having those same mounting screw holes.
• The stepped design allows use of blades with different bore sizes.
• A big 8-32 setscrew attaches the hub to the flat on your weapon shaft. (Remember to apply thread-lock.)
• The hub comes to a soft point so that your horizontal spinner robot can rest on it without being pulled in different directions.
- Accommodates blade bores of: 10mm, 16mm (5/8in), 20mm
- Recommended blade thickness: 1.6mm (0.63in) - 5mm (0.2in)
- Material: Anodized 6061 aluminum for high strength and low weight.
- Hub hex size: 25.4mm (1in)
- Nut hex size: 24mm (15/16in)
- Hub height: 13.7mm (0.54in)
- Setscrew: 8-32 knurled setscrew (5/64" hex wrench)
- Bore diameter: 3mm, but can be drilled out as big as 6.35mm (0.25in).
- Bore depth: 13mm (0.51in) - can be drilled through for double-supported shaft (ie. vertical spinners)
- Weight: 12.6g
- Observe the proper spin direction.
- Use threadlock on the nut and 8-32 setscrew. You do not want your blade coming off!
- If you do not have a thin 1" wrench, you will want to clamp the hub into a vice so you can tighten the blade before securing the Blade Hub to the motor shaft.
- If the Blade Hub will be resting on the ground, ensure the blade is perfectly horizontal so that the robot does not get pulled sideways.
- As with anything related to combat robots, it is POTENTIALLY DANGEROUS to add a spinning weapon to a robot. NEVER power up the robot outside of a safety enclosure. Always use a safety lock and follow proper activation procedure.
See the above image for different blade types. Note the spin direction. This will keep the nut tight on hits.
Reversing the direction will try to loosen the nut. This is fine for drive wheels, but not recommended for weapon blades.
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