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#1
Old 05-03-2006, 10:57 PM
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How do I drill a hole in a magnet?

I want to drill a hole in a ceramic magnet.

What special style of drill bit would be best? It is about ╝ inch thick, but I broke the metal drill bit and the ceramic bit broke the first magnet.

Any suggestions?
#2
Old 05-03-2006, 11:14 PM
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A quick Google search indicates using a laser.
#3
Old 05-03-2006, 11:18 PM
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Frankly, I don't think it's possible (excepting extraordinary means and apparatus). But if I absolutely had to try it, I would use a Dremel tool with the flexible extension attachment, a carbide or diamond tipped bit and do all of the drilling slowly under running water. Be sure the Dremel is plugged into a GFI protected plug for safety's sake. The flexible extension is just to keep the tool itself from getting wet. I don't know if this will work on a ceramic magnet, but it does work on wine bottles, although you break quite a few getting the hang of it.
#4
Old 05-03-2006, 11:18 PM
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Unfortunately my laser is at the repair shop. Come on really, my cat is waiting for me to figure this out.
#5
Old 05-03-2006, 11:41 PM
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Quote:
Originally Posted by Rhubarb
Frankly, I don't think it's possible (excepting extraordinary means and apparatus). But if I absolutely had to try it, I would use a Dremel tool with the flexible extension attachment, a carbide or diamond tipped bit and do all of the drilling slowly under running water. Be sure the Dremel is plugged into a GFI protected plug for safety's sake. The flexible extension is just to keep the tool itself from getting wet. I don't know if this will work on a ceramic magnet, but it does work on wine bottles, although you break quite a few getting the hang of it.
A battery-powered Dremel tool would be even safer. I personally wouldn't use a Dremel tool, even with the extension, with running water under it with 120V AC power going into the Dremel tool. Especially if it's a jerry-rig set up for a one-shot use. In theory the GFI plug should help a lot, but I wouldn't rely on that for the first level of safety (e.g. it should be a backup, not the main line of defense).
#6
Old 05-03-2006, 11:41 PM
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How large a hole are you trying to make?

For a small hole I would use a Dremel tool with the conical diamond tip. Use lots of fluid (machine oil is good) to cool the material (especially important if you want your magnet to stay magnetic!) and help with the dust. Ideally you should use the drill-press attachment to keep the bit aligned in the hole. Use high speed and very low pressure to avoid breaking it. It takes several minutes.

I've used this method to drill through thin stones (~1/4"), though I've never tried magnets.
#7
Old 05-04-2006, 12:00 AM
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Just a small hole, but I am getting the idea it is worth my time to find a magnet with a hole already in it.
#8
Old 05-04-2006, 12:04 AM
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Quote:
Originally Posted by bat312
Just a small hole, but I am getting the idea it is worth my time to find a magnet with a hole already in it.
Here's a good source for that: K & J Magnetics
#9
Old 05-04-2006, 12:11 AM
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Just a tip, you can put any Dremel/Rotozip/etc type bit in a regular drill, (or even a drill press if it will chuck down to 1/8 or so) and have much better control.

Just remember to go slow and keep the chuck tight.
#10
Old 05-04-2006, 12:33 AM
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Get a magnet from an old hard rive . They are super strong & are made of steel so they should be more readily drillable vs ceramic magnets
#11
Old 05-04-2006, 12:36 AM
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Quote:
Originally Posted by astro
Get a magnet from an old hard rive . They are super strong & are made of steel so they should be more readily drillable vs ceramic magnets
BTW Radio Shack (I think) carries magnets will holes already in the middle.
#12
Old 05-04-2006, 11:36 AM
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Quote:
Originally Posted by bat312
Just a small hole, but I am getting the idea it is worth my time to find a magnet with a hole already in it.
*Good idea!
Quote:
Originally Posted by astro
Get a magnet from an old hard rive . They are super strong & are made of steel so they should be more readily drillable vs ceramic magnets
*Not always so.
There are some ceramic magnets that are bright metal plated.
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#13
Old 05-04-2006, 12:42 PM
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Quote:
Originally Posted by astro
Get a magnet from an old hard rive . They are super strong & are made of steel so they should be more readily drillable vs ceramic magnets


they arent made of steel, they are coated in nickel. strong as hell in the magnetic department but very brittle.

I second the link to K&J magnetics, I have used them in the past and the service and prices are the best I have come across on the net.
#14
Old 05-04-2006, 12:49 PM
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I have to ask : Why is your cat waiting ?
#15
Old 05-04-2006, 02:45 PM
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Yes, and how did he communicate to you his desire that you drill a hole in a magnet?

Does he design his own toys?
#16
Old 05-04-2006, 03:11 PM
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I have 8 magnets on my desk right now that all have holes in the middle. I have 14 magnets without holes. I might bring one home and see if the Dremel would work. I'll report back later this evening, or tomorrow at least.

I'd love to hear more about drilling through the glass wine bottles though. I have had a certain project in mind for a while but it required drilling through a glass bottle.
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#17
Old 05-04-2006, 10:59 PM
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<snip>
Quote:
Originally Posted by Madd Maxx
I'd love to hear more about drilling through the glass wine bottles though. I have had a certain project in mind for a while but it required drilling through a glass bottle.
I was in Eureka Springs, Arkansas on vacation with my wife a few years ago and we wandered into what could most charitably be described as a hippie incense shop. In addition to hand-dipped incense, they sold incense holders that consisted of wine bottles with lotsof holes in them. THe incense stick was stuck into the cork and then the assmbly inserted into the wine bottle.

Okay, enough back story. I asked how they drilled the holes in the bottles and was told that they used a glass cutting drill bit under running water, worked slowly, and broke at least as many bottles as not. I haven't tried this myself, but have kept it in the back of my mind for future reference if the need arises.
#18
Old 05-04-2006, 11:34 PM
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I've heard of people drilling through glass (without or with minimal breakage) by chucking a piece of carbon steel tubing into a drill press, putting valve lapping compound onto the glass and using light pressure to gring the hole. I don't see why this wouldn't work for a magnet.

I'd also bed the magnet in some sort of putty so that it doesn't break when the bit grabs it.
#19
Old 05-05-2006, 05:35 AM
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A ceramic tile drill bit might do the job - again keep it cool with oil emulsion or water, as not only does heat blunt the cutting edge of the tool, it also demagnetizes magnets.

I'd perhaps use a blob of epoxy glue to attach a string.
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