Electromagnetic clamps? - Router Forums
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post #1 of 28 (permalink) Old 02-09-2017, 03:54 PM Thread Starter
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Default Electromagnetic clamps?

I see a lot of effort going into designing & laying out dogholes for work tables. Has anybody ever thought instead, to use a sheet of steel under the top piece of plywood and an electromagnet as a clamp. You could place your piece wherever you wand it, place the magnet on it & turn it on. And there it would stay.

Round Electromagnets > EM137-115ac-222

Talk about easy...depending on the article you are clamping, you could use 2, 3 or 4 magnets. Whatever is needed. I think it would be a real timesaver as well.

Just a thought! Am I crazy?
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post #2 of 28 (permalink) Old 02-09-2017, 04:10 PM
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I see a lot of effort going into designing & laying out dogholes for work tables. Has anybody ever thought instead, to use a sheet of steel under the top piece of plywood and an electromagnet as a clamp. You could place your piece wherever you wand it, place the magnet on it & turn it on. And there it would stay.

Round Electromagnets > EM137-115ac-222

Talk about easy...depending on the article you are clamping, you could use 2, 3 or 4 magnets. Whatever is needed. I think it would be a real timesaver as well.

Just a thought! Am I crazy?
costs come to mind and I believe those magnets aren't strong enough to hold securely w/ a sheet of plywood under them..
also there is the cords that may get in the way...
and if you hit one of those mags w/ your tooling... ewwww boy...

and... and... and...

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”

Last edited by Stick486; 02-09-2017 at 04:13 PM.
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post #3 of 28 (permalink) Old 02-09-2017, 04:51 PM Thread Starter
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I considered that. But I see that those magnets are 12 volt, you could put a battery on top of them. That site has magnets that hold up to 640 lbs. Even if you used the 44 lb one I linked, if you used 2 or three of them, how much force is a screw down clamp exerting? Imagine being able to place a block anywhere to be used as a stop for cutting fixed lengths. Couldn't get much easier than that. But then again, just thinking out loud. Thought it would be fun to kick it around!
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post #4 of 28 (permalink) Old 02-09-2017, 05:00 PM
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They work great on metal working ,such as welding set up benches that have a steel top, But I agree with Stick it would be cost prohibitive for wood working.
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post #5 of 28 (permalink) Old 02-09-2017, 05:01 PM
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I like the KISS/MISS route the best and old technology tools...
and what will those magnetic fields (think EMP) do to your high tech stuff...
MT Stringer, Shop guy and MYB506 like this.

This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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post #6 of 28 (permalink) Old 02-09-2017, 05:08 PM
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Quentin, I think the effort you're seeing by some members in the design and layout of dog holes isn't out of necessity but out of a desire to do it - at least that's my opinion.
I on the other hand, have a workbench made out of dimensional lumber with two sheets of 3/4" mdf on top. A row of dog holes in line with my vice is all I use. That bench has lasted me for years. I too believe in KISS - keep it simple s.......d. Electromagnets as clamps is really putting a lot of effort into it. No need to reinvent the wheel.
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post #7 of 28 (permalink) Old 02-09-2017, 05:41 PM
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Quote:
Originally Posted by Tonto1 View Post
I see a lot of effort going into designing & laying out dogholes for work tables. Has anybody ever thought instead, to use a sheet of steel under the top piece of plywood and an electromagnet as a clamp. You could place your piece wherever you wand it, place the magnet on it & turn it on. And there it would stay.

Round Electromagnets > EM137-115ac-222

Talk about easy...depending on the article you are clamping, you could use 2, 3 or 4 magnets. Whatever is needed. I think it would be a real timesaver as well.

Just a thought! Am I crazy?
You might be crazy but maybe not. All you have to do is develop and market it and you are rich.

Don in Murfreesboro,Tn.

Measure once cut twice and it's still to short.
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post #8 of 28 (permalink) Old 02-09-2017, 06:29 PM
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...and what will those magnetic fields (think EMP) do to your high tech stuff...
Or your heart!

That's my story and I'm stickin' to it!
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post #9 of 28 (permalink) Old 02-09-2017, 07:05 PM
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Back when I was working, we had a couple of guys with pacemakers - they had to follow a proscribed - and very well defined - path through the shop to avoid the equipment that put out a field that would mess up the pacemaker. There was even a problem with one of the portable MPI machines, they used to put up tape barriers so that the affected workers would know not to get too close.
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post #10 of 28 (permalink) Old 02-09-2017, 07:11 PM
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Or your heart!
pacemaker or hearing aide...
insulin pump...
digital watch...
digital tools...
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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