Magnetic Clamps

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xwass
Posts: 5
Joined: Wed May 14, 2014 8:55 pm

Magnetic Clamps

Post by xwass » Mon May 19, 2014 3:24 pm

Have been exploring bed/clamping options out there and had an idea about using a metal sheet (like 1/8" thick steel) attached to the top of the MDF that comes with the SO2 and then making clamps with magnets on the bottom to secure material to the bed rather than using a threaded/slotted system.
Plan to draw out a grid with sharpie on the metal sheet.

Anyone doing something like this already?
Any reasons you can think of this would not be effective?

Philip
Posts: 16
Joined: Wed Apr 30, 2014 9:08 am

Re: Magnetic Clamps

Post by Philip » Mon May 19, 2014 3:29 pm

I think t will be expensive as you'll need very strong magnets. Also magnets are relatively easy to displace sideways over the metal while that is exactly the motion you want to prevent.

xwass
Posts: 5
Joined: Wed May 14, 2014 8:55 pm

Re: Magnetic Clamps

Post by xwass » Mon May 19, 2014 3:37 pm

Thanks for the input.

I was going to try these for the magnet (use at work for hanging stuff and they are definitely capable of holding 20+ lbs each).
http://www.homedepot.com/p/Super-Magnet ... =5yc1vZ7aa

Something like this for the bed
http://www.homedepot.com/s/steel%2520sheet?NCNI-5

For this with the hardware to make the clamps would probably be in the $50 range.

Nigel K Tolley
Posts: 226
Joined: Sat Feb 08, 2014 4:06 pm

Re: Magnetic Clamps

Post by Nigel K Tolley » Mon May 19, 2014 8:01 pm

You can buy ace switchable magnets for not that much money. They make great clamps.

Bear in mind that magnets don't hold as well to thinner base material and are rubbish for even thin non magnetic stuff. You'll need a big and heavy steel baseplate.

Sent from my SM-N9005 using Tapatalk

xwass
Posts: 5
Joined: Wed May 14, 2014 8:55 pm

Re: Magnetic Clamps

Post by xwass » Mon May 19, 2014 8:25 pm

Those would be perfect, I will probably need to step up on the thickness of the steel for the bed like you said. Should add to the overall rigidity of the machine compared to the stock board it came with anyhow.

I can use these with my woodworking equipment when not on the Shapeoko which is a plus.

xwass
Posts: 5
Joined: Wed May 14, 2014 8:55 pm

Re: Magnetic Clamps

Post by xwass » Tue May 20, 2014 4:34 pm

In case anyone is looking for switchable magnetic clamps for something like this, these are very powerful (150lbs force) and $25 a piece.
http://www.leevalley.com/US/wood/page.a ... 55&p=65258

danimal
Posts: 332
Joined: Wed Mar 13, 2013 5:53 pm
Location: Colorado

Re: Magnetic Clamps

Post by danimal » Thu May 22, 2014 7:07 pm

If you design it right, those should work well. I would recommend limit switches as an upgrade first if you don't already have them. All it will take is one bad bit of g-code and a death plunge into your steel base for a really bad day.
Shapeoko # 1458

RT0701C Spindle || dual y motor || x axis nema23 with custom carriage 1000mm length || z axis nema23 linear rail upgrade with 1/2-10 ACME

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