Hi my name is HopelesslyFaithful (HF) (forum didn't allow all chars). I am from Notebookreview and while googling for my project. I came across this site a thread that was helpful but also made more questions. I posted this on NBR so i did a direct copy paste hoping i could get some expert help over here. So i have been wanting to either buy a very large rare earth magnet 1-2 feet in either direction. or created my own electromagnet. I plan on using this to regular clear the gravel drive way where my dogs run and my wife's horses walk.....Also where my cars drive down. My father-in-law is an idiot and throws crap everywhere so i use two different magnets right now but one is too weak and the other weighs 80 pounds and i hate dragging it around. I am too lazy to make a mount that keeps it 2 inches off the ground. Any higher it isn't strong enough to clear well. Hence why i want a rare earth magnet or an electromagnet that i can crank a ton of juice into and move it around the drive way/horse barn. I have never made and electromagnet but it doesn't seem to hard from what i have read. Anyone have any experience and can help me decide on what is best? I see some have 250 pounds of pull force so i am unsure what that means in actual performance....i assume it is ridiculous. Also if i get a 3 foot by 1 foot 2 inch REM that will have about 100-1000 pounds i think from what i have seen (i am unsure if that would be wise...i think that would pull me or things things heavy towards it right?). None are made that big so i'll have to put them together to make it. I know they are brittle as can be so i figure i would put a thin piece of steel or whatever metal would work as a base that would shield them from metal hitting them directly. I am wondering if an electro magnet would be better since i can turn it on and off. Though it wouldn't be as strong and would be limited to ~100 feet from an outlet plus cost more money over time. I think the several hundred pounds of pull would be near impossible to control with a REM that large....even a low quality one would have issues right? If i made a REM one i would want max 100-200 pounds right since that would be the max i could ever pull off. How expensive would an electromagnet be to build being let us say 2'x2' and 6'by2'? Also how much force would be generated and how much electricity needed? I'll take the 80 pound magnet and drag it once a month 50 feet and get about 1-2 pounds of random metal -_- (worse case) A few hundred square feet done real fast gets me a few pounds :/ hence why i want something better and faster. I also had a nail go into my foot a few months ago so it is a problem. The reason for one being 2'x6' is that i would mount it to my skid steer or my truck and drive it around. If i wanted to clear pasture i could barrow my father-in-laws 5kw propane generator and mount it all to the truck ^^ I figure this will be expensive but i can use this for the next 50 years of my life so i figure it is a worthy investment if possible so i don't have expensive vet bills or doctor bills or blown tires. My truck actually got a nail a year ago and i had to plug it :/ Electromagnet - Wikipedia, the free encyclopedia ignore my last statement it was dumb -ok it wasn't dumb you can use permanent magnets for the core.....not sure how much better it is. Although, it is suppossed to be in a N/S,S/N,N/S way so making a core like that our of REM maybe undo able. https://www.physicsforums.com/showthread.php?t=97483 Also i am always up for different ideas since i am sure someone has a better idea than me ^^ There was something else but i am blanking.... BTW I do know i need to get a DC power supply so any ideas on what voltage and amps would be awesome. EDIT: Also i am wondering this too. If a magnet has 300lb of pull and has an area of 30 square inches does that mean it has 10 lbs of pull per square inch? I would assume that a the field of a 300lb force would over lab in pull but still wouldn't be as good as a 300lb square inch piece right? If you need me to further explain/elaborate what i am getting at just ask.