Gunner sez: I would like to be
Now that'sa some spicey magnetic field.
Bob Swinney
will, through quantum effects, tunnel from the workbench in your shop to Floyds Knobs, Indiana (unless your shop is already in Indiana, in which case the object will tunnel to Trotters, North Dakota). The smaller mass of the object, the higher the probability. Therefore, disassembled parts, particularly small ones, of machines disappear much faster than assembled machines."
They might. How do you turn off the magnet to release the Stuff?
Thanks for th links!
Gunner "As physicists now know, there is some nonzero probability that any object will, through quantum effects, tunnel from the workbench in your shop to Floyds Knobs, Indiana (unless your shop is already in Indiana, in which case the object will tunnel to Trotters, North Dakota). The smaller mass of the object, the higher the probability. Therefore, disassembled parts, particularly small ones, of machines disappear much faster than assembled machines." Greg Dermer: rec.crafts.metalworking
Ill certainly check that out! Thanks!
Gunner
"As physicists now know, there is some nonzero probability that any object will, through quantum effects, tunnel from the workbench in your shop to Floyds Knobs, Indiana (unless your shop is already in Indiana, in which case the object will tunnel to Trotters, North Dakota). The smaller mass of the object, the higher the probability. Therefore, disassembled parts, particularly small ones, of machines disappear much faster than assembled machines." Greg Dermer: rec.crafts.metalworking
"Don Foreman" wrote
This is interesting, but it's only half the story. Lots of MMF is good, but pole design is even more important, if you want to pick stuff up.
I should think Gunner needs a line of alternating north and south poles, spaced about an inch apart if they are to be around 1/4 inch off the floor. It's the divergence, or the square of the divergence, of the magnetic field lines that determines how much pulling force you get.
-- Tony P.
THe important elements are this : Current in the winding, Higher is better; Number of turns, Higher is better; The metal used to be the magnet is soft. (permeability that is) Those are the basics.
Mart> I need to make a "picker upper" for swarf, nuts and bolts etc. My
Might be simpler to move the equipment out, get a rototiller and a pallet of cement, and turn the floor into Soil Cement in place. It's cheap to do, and better than constantly losing parts in the dust.
Rototill, add cement (and extra soil or amendments like sand if needed). Rototill again to mix, screed and compact flat and level, and spray with water. Allow a few days for a cure. Comes out like adobe.
-->--
Guessing only - scrape down the side when standing on the wheel. e.g. collect across a line, make it into a dot - then pinch the dot off...
Mart> >
Interesting. Id need a forklift and a couple weeks to do it though. And that pallet of cement is out of the que$tion.
But nice idea
Gunner
"As physicists now know, there is some nonzero probability that any object will, through quantum effects, tunnel from the workbench in your shop to Floyds Knobs, Indiana (unless your shop is already in Indiana, in which case the object will tunnel to Trotters, North Dakota). The smaller mass of the object, the higher the probability. Therefore, disassembled parts, particularly small ones, of machines disappear much faster than assembled machines." Greg Dermer: rec.crafts.metalworking
If you want something cheap that you can make in your shop, how about salvaging some TRANSFORMERS from scrap microwave ovens. The transformers have 2 windings, primary & secondary, wound on the center leg. If you cut off one end of the steel core you will have an "E" shaped piece left with both windings intact. The secondary has more turns and the primary has less resistance; you can use either or both in series to get the field strength you want with a usable voltage.
Microwave primaries often take up to 5 amps no load for short intervals. For DC you might want to limit it to 2 amps and even less for the secondary. You can put a bunch of these in series and might find a combination that would use rectified 110 vac.
Very cheap, does take some salvaging and a bit of work & experimenting.
I have, and I get a different proof.
Halve the diameter, quadruple the resistance per unit length, quadruple the wire length in a given volume, multiply by 16 the resistance. Amp-turns drops by a factor of 4.
Consider a coil with a single turn, connected to a power supply. If you now cut the wire in half lengthways with an imaginary insulator, and leave the ends connected to the power supply. I hope it's obvious that the magnetic field remains unchanged. Now, repeat this process nine times until you've got 1024 wires. Field still unchanged. Wire them all in series, and run from a power supply of 1024 times the voltage, and each wire has exactly the same current going through it, but the coil is running on 1/1024 the original current, and 1024 times the original voltage.
Sorry, I don't know. I just recalled seeing them in one of the catalogs they sent me.
R, Tom Q.
Haven't made one, but as an apprentice, one of the tasks was to drag around a permanent bar magnet, with wheels either side, to pick up stray metal bits from the shop yard. Most stuff larger than a small nail was picked up, and was easily scraped off.
Gunner scribed in :
ok, down at the dump somewhere you'll find a ready made magnet. the makers sell them as door fasterners for security doors at banks etc. usually 10 or 12 inches long, 4" wide. once on and the flat
3/8" plate on the door is against it, you will NOT open it without removing power first.... or breaking the glassmany turns of wire around a soft iron core, 2 coils on a U shape, or use a shape that returns around the outside of the coil for a narrow air gap. ruip a loudspeaker apart for an example of the permanent mag equivalent. short magnetic path = more power.
but as to designing the current requirement for X amount of magentic power etc, you'll need a rocket scientist for that, and I'm not one.
idea. get a microwave oven off the tip, rip the transformer out of it, remove secondary winding, use primary to power either that core (saw an end off so the poles are open) or make a new core that gives you your 12" spread, about .5" apart.
swarf, steam and wind
-- David Forsyth -:- the email address is real /"\
jim rozen scribed in :
why DC? AC attracts dirt just as well, with the bonus that it leaves nearby machine tools non magnetic after it passes by.
better get them properly in phase though.... but AC will still work fine
swarf, steam and wind
-- David Forsyth -:- the email address is real /"\
OK, the above was *definitely* written by a guy who has never seen Gunner's back yard! I've been wondering since this thread started how on earth he could roll around something 18" wide - when I was there it was absolutely PACKED with stuff! It would take him months just to get down to the dirt to make it into soil cement!
Cool idea though.
Grant
Glenn, I had just looked at his website, and can also picture Gunner's equipment bases plowing through the ground as they steadily make their way towards the electromagnet, Gunner's eyes wide with fear of being crushed before he can escape.
RJ
Me too. We're in agreement.
Nah..never happen. The 45 I carry daily, is non magnetic stainless steel
Gunner
"As physicists now know, there is some nonzero probability that any object will, through quantum effects, tunnel from the workbench in your shop to Floyds Knobs, Indiana (unless your shop is already in Indiana, in which case the object will tunnel to Trotters, North Dakota). The smaller mass of the object, the higher the probability. Therefore, disassembled parts, particularly small ones, of machines disappear much faster than assembled machines." Greg Dermer: rec.crafts.metalworking
Now THATS a scary thought..brrrrrrrr....Attack of the Killer MillMaster! NNNOOOOOOOOOOOOO!!!!!!!!
A terrible way to go..crushed to death between a 14" shaper and a Hardinge chucker...GACK!!!!!!!
Gunner
"As physicists now know, there is some nonzero probability that any object will, through quantum effects, tunnel from the workbench in your shop to Floyds Knobs, Indiana (unless your shop is already in Indiana, in which case the object will tunnel to Trotters, North Dakota). The smaller mass of the object, the higher the probability. Therefore, disassembled parts, particularly small ones, of machines disappear much faster than assembled machines." Greg Dermer: rec.crafts.metalworking
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