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Ed_Millis Inner circle Yuma, AZ 2292 Posts |
I'm wondering if batteries can power strong electromagnets? For my application, I would have a "strip" of wiring; electronics would "increment" the current forward to move the electromagnetism slightly ahead of the previous position. The magnetic pull would need to flow through 1 1/2 inches of wood.
Feasible on DC batteries? What kind? Ed |
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AGMagic Special user Cailf. 775 Posts |
Yes, it should be feasible but you will need some fairly serious current. Research linear induction motors as ir sounds like that is what you plan to build.
Tim Silver - http://www.facebook.com/pages/Magic-Woodshop/122578214436546
I know you believe you understand what you think I said, but I am not sure you realize that what you heard is not what I meant. Visualize Whirled Peas! |
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merlin5150 II Elite user Aurora, IL 414 Posts |
Search Grove electromagnet....it might be what you need.
http://www.seeedstudio.com/depot/Grove-E......820.html Jeff |
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rhiro Regular user Southern California 182 Posts |
Can you use a permanent magnet and move that via a mechanical rig, string, servo, etc.?
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Michael Baker Eternal Order Near a river in the Midwest 11172 Posts |
Quote:
On Jan 7, 2015, rhiro wrote: A permanent magnet with the strength to work through the thickness desired (quite strong) would be easy to attach, but perhaps not so much to detach. The advantage of an electromagnet is that you shut off the current and the magnet stops working.
~michael baker
The Magic Company |
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rhiro Regular user Southern California 182 Posts |
Quote:
On Jan 7, 2015, Michael Baker wrote: Agreed. It would be helpful to know more details regarding the effect Ed is trying to achieve. I was picturing something small being animated. If we're talking something more akin to a Light and Heavy Chest, then please ignore my suggestion! Ross |
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Michael Baker Eternal Order Near a river in the Midwest 11172 Posts |
Quote:
On Jan 7, 2015, rhiro wrote: Yeah, one of the issues I see often here is that a magician tries to be cryptic with their needs. I think often this is a bit of paranoia regarding their "idea", perhaps fearing theft of their intellectual property. But this can also be ethical fear of exposure on the forum, the possibility they are not even clear what they want to accomplish, or that they simply aren't communicating things clearly. There are lots of very gifted craftsmen that visit The Workshop, and lots of mechanical/engineering problems get solved. But, this doesn't make these fine people mind-readers! Just like visiting the doctor, if someone wants the best diagnosis and advice, sometimes they have to drop their pants and reveal all.
~michael baker
The Magic Company |
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DaleTrueman Veteran user Australia 317 Posts |
Quote:
On Jan 7, 2015, Michael Baker wrote: I don't want to stray too far off topic here but on the other side of that point I had been wondering if posting a link to a particular story about the light and heavy chest would of been exposing too much. I'm sure many would be able to guess the story. Being a relative newcomer I wasn't sure if it was giving away secrets or not My point would of been that they must of used a battery given the circumstances. But on the other hand I had no real answer or help for the original question. In the end I just decided not to post it. |
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Ed_Millis Inner circle Yuma, AZ 2292 Posts |
The cryptic tone was more to keep curious googlers from another aha moment!
The idea is simple: move an object sitting on a 1x6 forward until it falls off the edge of the wood. The wood would be set on top of my table, and the object (plastic cup with a ball in it) on top of the wood. Anything needed is mounted underneath. I had thought of a permanent magnet on a belt. But wondered if the "moving" electromagnet idea was feasable. Ed |
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TheRaven Special user 597 Posts |
You could use a pulley and counterweight hidden in the wood to move a permanent magnet-- when you tip the wood up -- the cup would rise up the incline as the counterweight went down.
Switching a linear bank of electro magnets in correct synchronization would be tricky. |
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Ed_Millis Inner circle Yuma, AZ 2292 Posts |
What about a tube 6" or 8" diameter under the top with a magnet mounted on the bottom. And on command a motor or counterweight rotates the tube a full turn? I'm thinking of a small battery-operated motor driving the tube by belt, and maybe some timer circuit to produce hesitations in the movement. I used to be pretty handy with TTL and 555 timers - don't know if they even still exist!
Ed |
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jolyonjenkins Inner circle United Kingdom 1181 Posts |
Sure, 555 circuits still exist, and so does TTL logic. But with the rise of cheap programmable ICs I doubt if I would bother with them except for the simplest job.
Jolyon Jenkins
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Ed_Millis Inner circle Yuma, AZ 2292 Posts |
Okay -- time to ask for help with the components for this project:
-- I do Visual Basic programming, but I've never tried a programmable IC. What would be good to start with? -- I need a motor, belt, and pulley for this. I've never done a motorized project before (well, not since my Erector set in junior high). The motor will be mounted to my table, so the mounting has to be such that table won't become a sounding board to audibly amplify vibrations. Ed |
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jolyonjenkins Inner circle United Kingdom 1181 Posts |
My experience is with the Arduino. You program it in C++ which is not very hard. This is good for prototyping. You can either leave your project on an Arduino, eg on the smallish Nano version, or else you can put it onto one of the small Atmel chips, such as the ATTINY85, which comes in a standard 8 pin package. There's lots of information around, eg on the Arduino forum. It took me quite a while to get to grips with it all but I would never go back to TTL stuff now. To run the motor you'll need to have a driver of some kind.
Jolyon Jenkins
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Wyld2006 New user If only I was clever enough to come up with something witty to back up my... 41 Posts |
Where can you purchase the full stage version of the Light Heavy Chest?
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Tap Roniart New user 39 Posts |
Ed,
Sounds like the same concept as a rail gun or maglev train. If a permanent magnet (PM) on top, electromagnets can pull & push (simultaneously) to move that PM where you like. In fact, a Hall Effect sensor or 2 would give your controller feedback as to where the PM *actually* is, instead of the EMs going through a pre-arranged routine-unaware of where the PM is. The EM approach has a lot of up-sides. It can be adjusted in strength, and dynamically programmed based on things like sensor input or a basic switch. It also has no moving parts, where a belt, wheels, motor would. you can also move more than one object simultaneously (based on a lot of variables, like size, the desired effect, etc.)... It is not difficult to also store and read preset values the program would use on a tiny SD card, so you wouldn't even need to program-the chip is programmed to simply run from what it is told, and the variables are so few that honestly, a few knobs to adjust things like speed, strength, etc. would be more than enough. Hard-coding values you need to revisit is certainly not performer-friendly. I like to make things have multiple ways to be run-all of which switchable at performance time. So you can change from looping, one-time, speeds low, med, high, and sensor-based (light, sound, contact) all with a single button-you don't even need a remote controller for that. Just giving you some ideas...
Tap Roniart
# PM me your effects looking for a method! # Please excuse any spelling or grammatical errors-especially ideas that end up being awful-as I am on cell. # Mods: I only break site rules that the "inner circle" themselves break. |
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Tap Roniart New user 39 Posts |
Quote:
On Feb 8, 2015, Ed_Millis wrote: Ed, motors-even steppers, will be audible for sure, and I personally wouldn't suggest the motor be directly connected to the device/platform-unless you intend a "table-top" presentation. If at all possible, and if you have to use a motor, I would suggest investigating isolating the motor's vibration by linking the 'belt drive' to the motor with a heavy (yet still invisible) monofilament (fishing line). I got the impression there is no heavy load involved, so if there is any way to connect the drive to the motor like this, it is not only a lot quieter, but additionally confuses the specs by apparently having no motor driving it! I have no idea your intended vision, but it would be a fun diversion to fully show the magnet, belt/chain (at the right time), but being driven by something unexpected, like a flask of water, a critter on a wheel, magic pellets, you get the idea... Sounds like a fun effect! Good luck!
Tap Roniart
# PM me your effects looking for a method! # Please excuse any spelling or grammatical errors-especially ideas that end up being awful-as I am on cell. # Mods: I only break site rules that the "inner circle" themselves break. |
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Anverdi-museum Inner circle 1196 Posts |
If using a coil cannot you bore a hole into the thick piece of wood first about 3/4 ways, large enough to contain the coil so it will have much less thickness for the current to travel through...the underside of whatever you are bulding should be hidden from the spectators anyway. I have built several effects with hidden electro magnets hidden inside the props, I always tried to cut a hole as close to the surface as possible or even all the way through then cover the surface with a thin sheet of veneer..
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TheRaven Special user 597 Posts |
Unfortunately this was a 2015 post that got bumped with an off-topic.
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Tap Roniart New user 39 Posts |
Quote:
On Oct 30, 2017, TheRaven wrote: Feel free to delete my posts at any time.
Tap Roniart
# PM me your effects looking for a method! # Please excuse any spelling or grammatical errors-especially ideas that end up being awful-as I am on cell. # Mods: I only break site rules that the "inner circle" themselves break. |
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