Hand vacuum, cyclonic
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<i>##(Original post) This hand vacuum is a WORK-IN-PROGRESS... <i>Ideally, it will be able to run at 70 W (via ESC) from 2 18650's charged through USB. <i>The cyclone design is loosely based on that of an industrial unit I once purchased for the company to separate wet muck from gas. I performed absolutely zero design calculations, so the questions is: Will it suck or "suck"? Time will tell after Banggood's electric goodies have arrived. Until then, I won't bother with the pet hair attachment. Besides, the dogs are with my ex anyway. Given that: I may just run some CFD design cases after dinner... Covid hey? <i>It sure is one of the ugliest vacuums I've seen, so please assume that this project will quietly die if performance is not AMAZING. #Update, 5 May 21: It sucks! Who'd have thunk: The thing actually works quite decently:) I refreshed the STLs based on the mods I made as I went along (It just sucks that you cannot turn on section analysis in real life). Unfortunately, the handle had to grow appreciably to allow assembly by fat-fingered folk like myself. This thing has become a weapon! As I'm not a Tuber and cannot upload a vid, I've added a snapshot showing ground coffee being chugged. I am tempted to play around with some impeller designs, but that's about it. I have not included the CAD model: As a newbie, I made a fair mess of things whilst modding along and fear that the kind people of Autodesk would take away my Fusion hobby license:) That's it! <p style="font-size:10px"><b>DOWNLOAD NOW for limited access to the crack attachment:)</b></p> A working version requires the following parts: - 2 18650 batteries (>= 10 Amp, I used LG ones) and battery holders - 2 USB battery chargers (e.g. [these](https://www.banggood.com/nl/10-Pcs-TP4056-Micro-USB-5V-1A-Lithium-Battery-Charging-Module-Board-TE585-Lipo-Charger-p-1255764.html?rmmds=myorder&cur_warehouse=CN); see photo. Cheap; using one on each battery simplifies the circuit) - a 7.4 V DC motor (see photo; I used a [Chihai SKU626132](https://www.banggood.com/nl/RS-370SD-DC-7_4V-50000RPM-Motor-Adjustable-Permanent-Magnet-Miniature-Motor-p-1150028.html?rmmds=detail-left-hotproducts&cur_warehouse=CN) from Banggood) - an ESC; I used [this one](https://www.banggood.com/nl/PWM-DC-Motor-Governor-5V-16V-10A-Speed-Switch-LED-Dimmer-Speed-Controller-p-1540563.html?rmmds=product_topselling&cur_warehouse=CN&act_poa=SKUC38859) from Banggood - An on/off switch. The included button holder fits a 15 mm KCD11 switch. - Bolts + nuts: - M4x30 (4) to attach fan duct and motor housing - M4x50 (4) to connect the handle halves - M3 x 6-ish (2) to connect the motor (I cut 10 mm ones) - M3 x 10 (2) to attach the impeller to the motor shaft (drop nuts into slots impeller) Electrics: - Wire the chargers to the individual batteries (charger + to battery +, otherwise things get hot I found) - Connect batteries in series and run to ESC input, incorporating the switch at any position - Connect motor to ESC (obviously) Printing: Most parts are not fussy about printer settings; you want to go as fast as possible, given the amount of plastic. - The snaps holding the lid to the body should be printed standing on their long edge to give them good strength. I increased the wall line count to obtain 100% infill. - As the ESC and chargers get pretty warm, <b>PLA may not be the best material to use for the handle</b>. My unit holds together, but I fear eventual meltdown if I'd charge through a high-capacity USB outlet. Charging from a low-capacity one such as a laptop's USB port seems to keep temperature under control.
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