World's First Modular Hubmotor Drum Spinner! User Guide Available Here! Latest Version CAD model here! And you can buy spare parts here. Specs and Usage The SCARAB drum system with its shaft, bearings, spacers and all weighs under 1lb (440g), with spinning mass of ~300 grams or 0.66 pounds, an immense amount of stopping power! Perfect for beetles looking for crazy weapon power in a tiny package. The effective diameter is 65mm (2.559") with stock teeth, and the drum fits onto a 125mm long shaft, with 102mm between uprights. Use with a 4S LiPo for best results and 268 mph theoretical tip speed. 5S/6S is not recommended. To assemble your SCARAB for use, you should first solder wires or the included MR30-PW-M connector to the stator PCB (easiest after removing the stator/shaft assembly from the drum). We recommend 18AWG wires or 16AWG if the wires will be over 100 mm/4 inches long. Be very careful not to create a short between phases, as this will damage your ESC! Reassembly: The stackup order should be: (Upright), Stator, Shiny Spacer, Drum, Black Washer, (Upright). The bolt shaft can go through from either side, but it's easiest from the drum side so it passes through bearings before sticking to the magnet ring. Every SCARAB Hubmotor Drum includes: 1X SCARAB Hubmotor Body + Magnet Ring Assembly 2024 anodized aluminum drum body with magnet ring installed 2X 12 x 12 x 8mm needle roller bearings installed 14 Poles (for AM32 settings) 1X 2222 2200kV SCARAB Drum Stator with PCB 1X MR30PW-M Connector 1 Pair of S7 Tool Steel 54HRC Teeth (beveled for a 5 degree rake angle) Works effectively like a single tooth drum with 1 center and 2 outer teeth 125mm long, 8mm diameter, 52100 Steel Shaft case hardened to ~60HRC with 2X flanged head M5 mounting bolts 8X M5 x 14mm button head class 12.9 tooth mount bolts 1X Silver Stator spacer and 1X black 8mm washer spacer Approximate Ri = 27 milliOhms CAD-calc MOI: 147,000 g mm^2, spinning mass only. Measured peak current draw up to 100A on spinup, continuous 18-22A at full speed on 4S LiPo. Size your battery accordingly, at least 4S 1100mAh for 3 minutes at max throttle. Pairs well with our RevvitRC AM32 ESC with BEC. Kinetic energy stored is ???J theoretically at max speed! Safety Disclaimer Warning: combat robots are not toys! They can be extremely dangerous. Click here for a safety video. Testing a robot with an active spinning weapon should never be done while maintaining a line of sight with the robot. Ideally, you should be testing inside an enclosed box or arena with at least 1/4" thick polycarbonate windows or top to see through, and 1/2” or thicker plywood or MDF construction. Operation (Including testing) outside of a suitable arena or test box could cause serious injury. By purchasing this product you acknowledge that you are responsible for the safe use of this product and that Just ‘Cuz Robotics or its employees are not liable for any injuries or damages.
