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How to glue in magnets

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Forum topic by Lt_scout posted 06-21-2020 12:59 AM 582 views 1 time favorited 18 replies Add to Favorites Watch
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Lt_scout

47 posts in 1377 days


06-21-2020 12:59 AM

Hi Guys,

Any thoughts on gluing 1/4” neodymium magnets into plywood. I have tried epoxy, silicone, gorilla glue and I’ve come full circle to yellow wood glue.

I make and sell these specialty artist easels and so far so good but today a customer had a magnet come out.

I’m reading that it’s a good idea to scratch up the glue side and use isopropyl alcohol to clean it, then epoxy.

Anyone got this magnet gluing figured out?

-- When you know you can do more with less, you will require less to do more.


18 replies so far

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CWWoodworking

874 posts in 985 days


#1 posted 06-21-2020 01:08 AM

Try a caulk, geocel for rv’s.

The stickiest caulk I ever used.

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Redoak49

4805 posts in 2795 days


#2 posted 06-21-2020 01:28 AM

I drill the holes slightly undersized and press fit with yellow glue. Slight abrasion of the magnet glue surface is good.

You can take a 1/4” drill bit and reduce the diameter slightly with emery paper or use a 6 mm drill bit.

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MrWolfe

968 posts in 930 days


#3 posted 06-21-2020 01:34 AM

I sometimes drill it a little deeper (a millimeter or so) and then glue a wooden dowel into the hole over the magnet and cut it flush with the surface. It hasn’t failed yet but the wooden dowel plug has to be pretty thin.
Jon

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jonah

2123 posts in 4105 days


#4 posted 06-21-2020 01:57 AM

Epoxy has always worked for me, and I’ve done it at least twenty times.

I do rough up the bottom side of the magnet with coarse sandpaper.

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MrUnix

8160 posts in 3005 days


#5 posted 06-21-2020 03:27 AM

For the speed rotors I made for my scroll saw (20 magnets around the edge of a 2” wooden disc), a 1/4” forstner bit made the hole for them to sit in, and then they got glued in with regular titebond wood glue. The rotors spin pretty fast, but I haven’t lost a magnet yet. I imagine that epoxy would be even better.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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CaptainKlutz

3358 posts in 2300 days


#6 posted 06-21-2020 03:59 AM


Epoxy has always worked for me, and I’ve done it at least twenty times.
I do rough up the bottom side of the magnet with coarse sandpaper.

- jonah

+1 Have had zero magnet failures with both epoxy or thick CA glue; providing you sand the surface with 60-80 grit and clean all skin oils off with acetone or lacquer thinner first.
YMMV

-- If it wasn't for bad luck, I wouldn't have no luck at all, - Albert King - Born Under a Bad Sign released 1967

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Lt_scout

47 posts in 1377 days


#7 posted 06-21-2020 04:25 AM

OK… excellent, this helps me a lot. good dope guys, thanks. I think the yellow glue is plenty sufficiant to hold providing the magnet is rough and clean, is what I’m deducing from you all and my own experience. But the epoxy seems like the ultimate method.

...But I have had magnets come out even after epoxying them in, but I didnt clean with spirits first.

rather not work with epoxy for production work, might gamble with the yellow glue.

Thanks again fellas

-- When you know you can do more with less, you will require less to do more.

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Walker

385 posts in 1278 days


#8 posted 06-21-2020 04:45 AM

I’ve glued many Neo Magnets like that into wood with common super glue. Home Depot HDX brand is cheap and works great. You can also buy ring magnets that accept a screw.

https://www.kjmagnetics.com/products.asp?cat=16&gclid=EAIaIQobChMIsv6amYyS6gIV0cDACh2hvwDKEAAYASADEgJ_G_D_BwE

-- ~Walker

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therealSteveN

5948 posts in 1380 days


#9 posted 06-21-2020 05:30 AM



I sometimes drill it a little deeper (a millimeter or so) and then glue a wooden dowel into the hole over the magnet and cut it flush with the surface. It hasn t failed yet but the wooden dowel plug has to be pretty thin.
Jon

- MrWolfe

I’ve only used them on knife blocks, and I use face grain plugs, usually a contrasting wood to cover the magnet. You are correct, a thin slice or you start blocking the magnet.

-- Think safe, be safe

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wildwoodbybrianjohns

1825 posts in 353 days


#10 posted 06-21-2020 06:19 AM

I use CA glue, clean first with acetone. No failures to date.

-- Wildwood by Brian Johns: The Big Bang: Nothing - exploded into Everything. Thanks to Nothing.

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robscastle

7238 posts in 3010 days


#11 posted 06-21-2020 07:04 AM

-- Regards Rob

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tvrgeek

1008 posts in 2455 days


#12 posted 06-21-2020 07:11 AM

JB Weld. I clean with alcohol first.

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Woodbum

928 posts in 3872 days


#13 posted 06-21-2020 01:59 PM

Medium or thick CA glue works great.

-- "Now I'm just another old guy wearing funny clothes"

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Gene Howe

12217 posts in 4235 days


#14 posted 06-21-2020 03:19 PM

Like everyone has suggested, an alcohol massage does the trick. They love a good rubdown.
I use vinyl or rubber gloves when using CA. They also prevent transfer of skin oils.

-- Gene 'The true soldier fights not because he hates what is in front of him, but because he loves what is behind him.' G. K. Chesterton

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splintergroup

3865 posts in 2029 days


#15 posted 06-21-2020 03:21 PM

You need some “tooth” for the adhesive. I’d recommend epoxy or something “sticky”, PVA glue and metal just isn’t very strong.

The ultimate is countersink style (which can be pricy)

or magnets with a step to trap the glue

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