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Old 19-07-2017, 09:51   #16
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Re: Making and using an electromagnet?

"Magnet wire is copper wire with a coating of insulation, and is used in electromagnets, transformers, Tesla coils, speakers, inductors, guitar pickups, and motors. It is available in many sizes, temperature ratings, and colors. Magnet wire allows multiple layer of wire to be wound together without short circuiting."
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Old 19-07-2017, 09:52   #17
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Re: Making and using an electromagnet?

For retrieving anchors and such, I would try using a large rare-earth magnet before making my own electromagnet. You would need a *BIG* electromagnet and lots of electrical power to do the same amount of lifting.
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Old 19-07-2017, 09:54   #18
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Re: Making and using an electromagnet?

Safe to assume that many electronics have bit the dust due to a short circuit after the wire coating was compromised due to heat, water, abrasion, critters etc. Probably be some sparking....possible fire hazard if the "perfect storm" hits.
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Old 19-07-2017, 09:58   #19
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Re: Making and using an electromagnet?

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For retrieving anchors and such, I would try using a large rare-earth magnet before making my own electromagnet. You would need a *BIG* electromagnet and lots of electrical power to do the same amount of lifting.
The jury may be out on that. I was shocked at the power of the electromagnet that we made.

A normal magnet that would lift a substantial anchor with its hook in the sand?

Neodymium magnets, on the other hand, are very powerful.
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Old 19-07-2017, 10:02   #20
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Re: Making and using an electromagnet?

[QUOTE=Brewgyver;2436673]He wants to wipe the hard drive of a laptop, from outside the police evidence room... [/QUOTE

Interesting on a sailing forum. GS11,12,or 13?
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Old 19-07-2017, 10:10   #21
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Re: Making and using an electromagnet?

In spite of the titanium alloys, I foresee this becoming a block of rust after one dip: https://www.amazon.com/BestEquip-Mag...dymium+magnets
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Old 19-07-2017, 10:21   #22
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Re: Making and using an electromagnet?

I suggest the idea of using the magnet, of whatever type, to locate the anchor or other ferrous object, and then sending a diver down to attach a line for hoisting. This would not need a very strong magnet.
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Old 19-07-2017, 10:23   #23
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Re: Making and using an electromagnet?

FWIW...they seem to rate magnets by what they will pull, which is maybe 3 times what they will lift. I guess that is why I was disappointed by my last "lifting magnet" purchase.
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Old 19-07-2017, 10:30   #24
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Re: Making and using an electromagnet?

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I suggest the idea of using the magnet, of whatever type, to locate the anchor or other ferrous object, and then sending a diver down to attach a line for hoisting. This would not need a very strong magnet.
I don't like diving over 110'...use my air too fast. Not to mention the anchor though I do have lift bags somewhere....if they have not been stolen yet.

People have no self reliance and bags of cash in some peoples world.
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Old 19-07-2017, 10:42   #25
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Re: Making and using an electromagnet?

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I don't like diving over 110'...use my air too fast.
I've used a magnet to retrieve objects at my home dock. 15 feet of crystal clear water, I can see it on the bottom....still almost impossible to hook it with a strong magnet. 30 minutes later, success!

If you think you are going to retrieve something from 100 feet down, or even 30 feet down, the magnet is not going to be the problem.

I suggest you use a store bought magnet (like the big one I bought at Princess Auto), and toss some metal object off your dock (how about your car keys...thats handy, right?). I'm sure it will be an interesting experience.

Also, be sure to store your magnet near your autohelm, hard drive, phone, chartplotter, or compass. Not a problem.
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Old 19-07-2017, 12:04   #26
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Re: Making and using an electromagnet?

[QUOTE=softdown;2436724]
Quote:
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He wants to wipe the hard drive of a laptop, from outside the police evidence room... [/QUOTE

Interesting on a sailing forum. GS11,12,or 13?
It was a reference to the Breaking Bad TV series.
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Old 19-07-2017, 12:10   #27
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Re: Making and using an electromagnet?

[QUOTE=Brewgyver;2436822]
Quote:
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It was a reference to the Breaking Bad TV series.
I totally got it...it was very funny!
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Old 19-07-2017, 12:33   #28
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Re: Making and using an electromagnet?

Quote:
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I've used a magnet to retrieve objects at my home dock. 15 feet of crystal clear water, I can see it on the bottom....still almost impossible to hook it with a strong magnet. 30 minutes later, success!

If you think you are going to retrieve something from 100 feet down, or even 30 feet down, the magnet is not going to be the problem.

I suggest you use a store bought magnet (like the big one I bought at Princess Auto), and toss some metal object off your dock (how about your car keys...thats handy, right?). I'm sure it will be an interesting experience.

Also, be sure to store your magnet near your autohelm, hard drive, phone, chartplotter, or compass. Not a problem.
Need to tag you as a dispenser of dangerous advice.
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Old 19-07-2017, 14:13   #29
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Re: Making and using an electromagnet?

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So 60 pounds of 4/0 copper welding cable attached to a 1600 pound forklift battery would be pretty strong I may guess. What about the iron piece that supports the copper wiring?
I think that what you have described would be more like a firework than a lifting magnet! But you could heat up your bath water pretty quickly...

And FWIW, I had some GME outdoor speakers that died from corrosion. I removed the magnets from them before scrapping. They are circular with a convenient hole through the center for a bit of rope, and capable of lifting more than the store-bought one from WM. Very good for retrieving magnetic items dropped overboard.

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Old 19-07-2017, 18:54   #30
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Re: Making and using an electromagnet?

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