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Where To Get Sets and Parts For discussions about swapmeets, rallies, NVCF and BVWS, car boot sales, antique and charity shops, dealers, newspaper adverts, the local tip and just about any other source of equipment (other than eBay). |
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4th Jul 2019, 3:35 pm | #1 |
Dekatron
Join Date: Aug 2016
Location: Colchester, Essex, UK.
Posts: 4,106
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Inexpensive Neodymium magnets
I have just salvaged a very powerful little magnet (7mm diam. x 2mm thick) from an o/c crankshaft position sensor. (Effectively a freebie)
Not all engine/wheel position or movement sensors are of this type, but plenty are. Dave |
4th Jul 2019, 3:55 pm | #2 |
Dekatron
Join Date: Feb 2005
Location: West Cumbria (CA13), UK
Posts: 6,127
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Re: Inexpensive Neodymium magnets
They also appear to available new in similar sizes at about £2.50 for ten.
__________________
Mending is better than Ending (cf Brave New World by Aldous Huxley) |
5th Jul 2019, 12:10 am | #3 |
Heptode
Join Date: Sep 2005
Location: LEEDS.......North of the River Aire.
Posts: 872
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Re: Inexpensive Neodymium magnets
Old hard drives are also a good source, if you can get into them. Watch your fingers they are very powerful.
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5th Jul 2019, 1:56 am | #4 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: Inexpensive Neodymium magnets
Old Sky+ boxes.
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5th Jul 2019, 2:48 am | #5 |
Banned
Join Date: Jun 2015
Location: Mareeba, North Queensland, Australia
Posts: 2,704
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Re: Inexpensive Neodymium magnets
Not rare earth magnets, but very strong anyway, and there are hundreds freely available.
Magnetrons. I leave them in the weather for a couple of months which kills the glue that's used, unclip the heatsink, and you get two very strong round magnets. Joe |
5th Jul 2019, 3:19 pm | #6 |
Dekatron
Join Date: Nov 2003
Location: Heckmondwike, West Yorkshire, UK.
Posts: 9,642
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Re: Inexpensive Neodymium magnets
Time was when that was the fate of CRT focussing magnets.
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5th Jul 2019, 10:23 pm | #7 |
Octode
Join Date: Feb 2018
Location: Southampton, Hampshire, UK.
Posts: 1,061
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Re: Inexpensive Neodymium magnets
Here are some of my neodymium magnets. The cylindrical one came out of an old shake and light torch and the others were purchased on eBay. These magnets are great for making many interesting projects. I have made a pulsed DC motor from these magnets using an old VCR drum head, an electromagnet and a reed switch.
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6th Jul 2019, 12:26 am | #8 |
Nonode
Join Date: Jun 2007
Location: Coulsdon, London, UK.
Posts: 2,163
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Re: Inexpensive Neodymium magnets
Please remember to keep them away from heart pacemakers and colour CRTs..
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7th Jul 2019, 11:16 pm | #9 |
Hexode
Join Date: May 2015
Location: Northampton, Northants, UK.
Posts: 380
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Re: Inexpensive Neodymium magnets
I have two hard disk drive magnets currently holding a wrist rest of my own design to my desk (a right angled piece of steel that was once part of a box, with some foam on top).
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8th Jul 2019, 12:18 am | #10 |
Dekatron
Join Date: Apr 2012
Location: Worksop, Nottinghamshire, UK.
Posts: 5,553
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Re: Inexpensive Neodymium magnets
I have just come across a couple of magnets that are ripe for harvesting.
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8th Jul 2019, 8:46 am | #11 |
Dekatron
Join Date: Jun 2013
Location: East Sussex, UK.
Posts: 3,326
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Re: Inexpensive Neodymium magnets
I've used the magnets from a hard drive to hold doors open in our house. They are strong enough to stop the doors closing when the wind blows and tries to slam the doors shut.
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