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| Hoping for a neato idea. |
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| Zakk:
Going to peruse the part for the spin/light control today. I have a couple of motors from a failed drone-repair, but no idea if they have any kind of non-zero-drag startup power, although I'm quite sure they work with variable power, so could be that they get a jolt to start turning then scale down the voltage... I did a fair bit of arduino experimentation when I built a custom alarm system for my gun vault a few years ago, I -think- I have a box full of switches, sensors, breadboards and a million led's somewhere, but I will have to grab another arduino and I'll pick up some of those gikfun boards as well. Definitely nice not to have to figure out the programming... I seem to recall that was the longest part of my last build, getting the nuances of the programming. I made a TOS star trek panel that actuated not only a relay for the lights, but one for an electro magnetic lock for the door, AND a backup power supply in case of power outage. You had to punch in a sequence after the motion sensor was triggered, or a blaring siren went off. Best $20 alarm system I ever had... it even ran banks of LEDS which lit the guns, and monitored the heat on the LED heatsinks, dimmed them if they got hot, etc. I remember getting ALL that done and debugged (took weeks to get everything done) and the first arduino board (can't recall which gen) burned out, but the newer revision I replaced it with ran for years until I sold that house (presumably still working...) Appreciate you just laying everything out though, should make it much quicker. I am quite sure now that I'm going the arduino route that I will incorporate a lot more "stuff" to the build, I mean, why only use it for spinning a cube? :) Ahh rabbit holes...I remember thee. |
| PL1:
--- Quote from: Zakk on June 17, 2024, 11:26:54 am ---I have a couple of motors from a failed drone-repair --- End quote --- Drone motor . . . as in a motor that spins a propeller fast enough to generate lift? :dizzy: The code only works with a stepper motor. You can find lots of NEMA 17 stepper motors on Amazon for under $10. This one is $7.65 and has a 5% coupon. https://www.amazon.com/Nema17-Stepper-Stable-Reinforced-Sealed/dp/B0CZ4LV37B/?th=1 --- Quote from: Zakk on June 17, 2024, 11:26:54 am ---I'll pick up some of those gikfun boards as well. --- End quote --- Here are some less expensive ones to consider. https://www.amazon.com/ElectroCookie-Solderable-Breadboard-Electronics-Gold-Plated/dp/B07ZYNWJ1S/?th=1 https://www.amazon.com/dp/B09WZY8H3X/?th=1 Scott |
| Zakk:
--- Quote from: PL1 on June 17, 2024, 03:51:19 pm --- --- Quote from: Zakk on June 17, 2024, 11:26:54 am ---I have a couple of motors from a failed drone-repair --- End quote --- Drone motor . . . as in a motor that spins a propeller fast enough to generate lift? :dizzy: The code only works with a stepper motor. You can find lots of NEMA 17 stepper motors on Amazon for under $10. This one is $7.65 and has a 5% coupon. https://www.amazon.com/Nema17-Stepper-Stable-Reinforced-Sealed/dp/B0CZ4LV37B/?th=1 --- End quote --- I would assume that these drone motors are speed controllable AND would have fairly good torque ratings?? My concern is the overall weight that I'm spinning around, not sure if a $2 stepper motor would be up to the task. I mean worst case I can just build some gearing into the mount for speed reduction, but torque is the big variable. The cube itself is 6lbs, plus whatever handing device and gearing/mount. Overcoming the initial inertia of startup is more what I was thinking about here. Maybe I should take a look at just a beefier stepper motor. --- Quote from: PL1 --- --- Quote from: Zakk on June 17, 2024, 11:26:54 am ---I'll pick up some of those gikfun boards as well. --- End quote --- Here are some less expensive ones to consider. https://www.amazon.com/ElectroCookie-Solderable-Breadboard-Electronics-Gold-Plated/dp/B07ZYNWJ1S/?th=1 https://www.amazon.com/dp/B09WZY8H3X/?th=1 Scott --- End quote --- Those should work. Amazon is REAL sketchy about deliveries out where I'm at, but I can usually get things routed to the post office in town... |
| PL1:
--- Quote from: Zakk on June 17, 2024, 05:06:36 pm ---I would assume that these drone motors are speed controllable AND would have fairly good torque ratings?? --- End quote --- They run at variable but high speed in one direction -- they aren't designed to reverse. The torque rating will actually be lower because of the high rotation speed. - Picture trying to get a car to move from a dead stop using only 4th gear. You'll stall the engine every time. - For those who don't drive stick, your automatic transmission probably goes R N D 2 L. L = low gear = more torque. --- Quote from: Zakk on June 17, 2024, 05:06:36 pm ---My concern is the overall weight that I'm spinning around, not sure if a $2 stepper motor would be up to the task. --- End quote --- As I said earlier, a $2 28BYJ-48 might work with a light plastic model, but definitely will not work for what you're doing. --- Quote from: Zakk on June 17, 2024, 05:06:36 pm ---I mean worst case I can just build some gearing into the mount for speed reduction, but torque is the big variable. The cube itself is 6lbs, plus whatever handing device and gearing/mount. --- End quote --- Building a gear box for a drone motor for this application is 100% GUARANTEED fail. --- Quote from: Zakk on June 17, 2024, 05:06:36 pm ---Overcoming the initial inertia of startup is more what I was thinking about here. Maybe I should take a look at just a beefier stepper motor. --- End quote --- The Mostly Printed CNC (MPCNC) uses 76 OZ/in NEMA 17 motors. NEMA 17 is the mount-hole pattern size, not the torque rating, so you can easily change to another NEMA 17 motor with more torque if this 84OZ/in one isn't strong enough. (Didn't expect you'd need to turn a 6 pound assembly.) https://www.amazon.com/STEPPERONLINE-Stepper-Bipolar-Connector-compatible/dp/B00PNEQKC0/ - Worst case, you might need to move up to a more expensive NEMA23 motor and driver. You should be able to rotate a 6 pound mass if you get a properly rated motor (not sure exactly how much torque you'd need :dunno) and design the rotation mech correctly. Consider using something like a 2" lazy susan bearing (smaller is better) . . . . . . the bottom would be attached to the shelf and the cube would be mounted on a hollow tube (red) passing through the center of the bearing (blue) and attached to the top plate of the bearing. LED wiring goes through the tube. A metal arch (gray) from one corner of the top of the bearing to the opposite corner connects the top to the stepper motor. (green) - The arch transmits the torque from the motor to the cube. Scott |
| Zakk:
Hmm, very good, never thought about the reverse, and yeah, I just grabbed a 5lb weight and started really trying to figure out how easily it is to start it turning. A fair bit... Acrylic tubing was what I was going with. The place that sold the mirrors also sold acrylic tubes, so I added in a 6' length of 2" ID tubing. My thought was to hide both the power wire and the hanging wire inside that, and glue the gearing to the tube (which would hopefully also reduce swing/sway in the setup). I want the tube to be as inconspicuous as possible, I should be able to just grind it to fit the corner contours. I'm hoping that 2" will be sufficient, but I can always order something different if not. Cube is on the way, no idea about the mirrors. Shipping is ALWAYS an issue out here, smaller shipping companies just "lose" packages. I'll just hunt for a stepper motor that will work no questions. Cost is not an issue, I just wanted to use what I have on hand, since those little motors were $$$ and didn't work as advertised. I'll get something industrial where I can see the operating parameters. Lazy susan might work. It would give me something to hold the tubing, probably just cross bolt across the top of it, attach the gearing, and bob's yer uncle. Thanks for the help, I would very likely have been muddling at these bits for weeks trying to get it right... |
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