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Dec 18, 2011, 11:45 AM
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Question

Building board magnets


I am a scratch and kit builder...old habits are hard to break! Lately I have seen builders using magnets to hold balsa peices to a metal building board in stead of pins on a traditional building board. They are used to hold ribs in place while glueing the ribs tothe spars, etc. They are also used when laminating balsa strips to create curved pieces, etc.

Does anyone have a source for magnets that can be used for thi purpose. The ones I have seen in builders photos look like cabinet latch magnets without the plastic cases.
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Dec 18, 2011, 01:55 PM
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BlazerB52's Avatar
I will try to find an old post of mine that had good source for them.
Dec 18, 2011, 01:58 PM
What's my age again ?!
derogg's Avatar
I think you need fairly strong magnets. Like rare earth or neodymium magnets. With smaller pieces you probably could use regular magnets. Most hardware stores or craft stores have magnets.You can also take apart an old computer hard drive and salvagethe magnets that are in there. I have never used them to build an entire model. Hopefully someone who has can chime in and give a better account of how to do that.
- Dirk
Dec 18, 2011, 02:03 PM
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BlazerB52's Avatar
Here is what I used.

http://www.allelectronics.com/make-a...-MAGNET/1.html
Dec 18, 2011, 02:09 PM
Registered User
BlazerB52's Avatar
I pitched the base plate. What is nice is the holes make it easy to attach to your uprights ect.

Here is helpful links:

http://www.airfieldmodels.com/inform...d/fixtures.htm


http://www.airfieldmodels.com/inform...oard/index.htm


Hope this helps.
Dec 18, 2011, 03:05 PM
Micro Boat Forum Founder
boredom.is.me's Avatar
supermagnetman.net
Dec 18, 2011, 09:27 PM
Registered User
Try this: http://www.magnetsource.com part number CA41LWH

John
Dec 19, 2011, 04:05 AM
Registered User
TRY THIS ONE http://www.magnetsource.com/airfieldmodels/
BILL
Dec 19, 2011, 05:06 PM
Balsa + glue + bluesky= fun
leaktech's Avatar
Quote:
Originally Posted by BlazerB52 View Post
I pitched the base plate. What is nice is the holes make it easy to attach to your uprights ect.

Here is helpful links:

http://www.airfieldmodels.com/inform...d/fixtures.htm


http://www.airfieldmodels.com/inform...oard/index.htm


Hope this helps.
Blazer, Did you make fixtures? Clamps for the fixtures? What size metal building board are you using?
Dec 22, 2011, 11:52 AM
Balsa + glue + bluesky= fun
leaktech's Avatar
Quote:
Originally Posted by BlazerB52 View Post
I paid about 57 bux for 150 of these shipped. Just need some sheet steel, cut out some 1/4" ply triangles, and bolt them together. Just one magnet will pick up my bread toaster. It weighs 27oz. So two magnets bolted on one triangle will have a hold down force of 3.3 lb's. Not bad and it's possible to add more magnets with a longer bolt.
Dec 22, 2011, 12:07 PM
Registered User
rcav8r2's Avatar
Quote:
Originally Posted by leaktech View Post
...Just one magnet will pick up my bread toaster....
WOW that's a strong magnet. I need to get some. I got some in a kit designed as a magnetic building board. The magnets won't even stay on the board if I tilt it more than 45 degrees... so I gave up on building with them...although the idea seems like such a good one
Dec 22, 2011, 02:41 PM
Balsa + glue + bluesky= fun
leaktech's Avatar
Quote:
Originally Posted by rcav8r2 View Post
WOW that's a strong magnet. I need to get some. I got some in a kit designed as a magnetic building board. The magnets won't even stay on the board if I tilt it more than 45 degrees... so I gave up on building with them...although the idea seems like such a good one
rcav8r, Your weak magnets are many times stronger if you have steel plates on both flat sides. These magnets here will only hold 4.5oz without the plates. The plates allow the magnetic field to increase strength. Someone with a physics background will know why it works better with the plates, I sure don't. One thing's for sure, I'm having fun in the man cave and the flying field.
Dec 22, 2011, 03:13 PM
Registered User
The original creator was Eldon J Lind company, which apparently got bought out by Great Planes who produce Magic Magnet Building Board System now discontinued

places to buy magnets

http://www.kjmagnetics.com/
http://www.hobbylinc.com/htm/gpm/gpmgpmr7025.htm

DIY board systems

http://www.airfieldmodels.com/inform...f_cottrell.htm

http://www.rcuniverse.com/forum/m_91...tm.htm#9122050


hope this helps
Dec 22, 2011, 08:08 PM
Registered User
for the steel sheet, look in your yellow pages (or internet search) for steel processors near you. these are businesses that cut up steel coils to sheets (or slit them into narrower widths). they may give you a scrap sheet, or maybe only have to pay a minimal amount. Just let them know you need something pretty flat. They almost always cut off and scrap some of the metal on the outside of the coil, or maybe they cut out some minor defects (that won't hurt for your purposes). You might be able to get some galvanize sheet from an HVAC fabricator/contractor too.
Galvanize or painted would be good, won't rust as soon.
the thicker the gauge of the sheet, the better the magnets will hold, but that means it will be heavier and thus more difficult to move out of the way.
Last edited by jonquinn; Dec 24, 2011 at 05:52 PM. Reason: spelling
Dec 22, 2011, 10:57 PM
Registered User

magnets and boards


Second the galvanized sheet metal from a/c and heat ducting. Contact cement the thin steel to a sheet of MDF an you're good to go. I don't find the magnetic force in any way diminished.

By the way, I recommend 8 lb. cabinet latches ( rectangular w/two metal plates). I have 2 lb. and 12 lb. styles and with some of my fuse jigs wouldn't come off the board with 4 12. lb magnets -- had to cut back to two on each fixture.

The lighter magnets are useful for holding ribs vertical in close proximity to other ribs. If you use stronger magnets very close together, they all fly into really big piles of stuck-together magnets!


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