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Need Electromagnet help for table saw jig hold down. Answered

Hey everybody,

I'm making a table saw feed kit, that also required that I make a fence for it. I decided to make a fence out of wood, that I jointed square. So you folks can get an Idea, I have pictures, at least for the feed kit. And yes it does feed wood across the top of the table, like it should. I just haven't tested it with the blade running yet, but I'm sure it will work fine. It's likely I will write a comprehensive guide on how I did in the future.

The issue I have is with the fence. When I clamp it on the end of the table saw it lifts up in the middle where I mounted the power feed. It's essential it remains flat to the table.

Today, I made an electromagnet with a 5/8 bolt and 2 washers using 26 gauge winding wire, It GOT WAY TO HOT!

I have seen door electromagnets, which leads to my question. If I use this type of magnet, will it still get extremely hot? I'm referring to the ones that have about 100lbs of hold down force, and are about 25 dollars.

I'm aware that twist lock magnets are available, but they are way more expensive, plus the same power supply that drives the steppors can power the magnet.

If someone can get me in the know I'd appreciate it.

Comments

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Yonatan24
Yonatan24

11 months ago

Search for Andy Klein's magswitches. A cool solution.

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Orngrimm
Orngrimm

Reply 11 months ago

Build your own:
Cool!

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Yonatan24
Yonatan24

Reply 11 months ago

Or that might be what you referred to as twist lock magnets.

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Downunder35m
Downunder35m

11 months ago

I like your idea of a feeder but I fail to see the problem with the lifting up in the pics.
These door magnets work great for what you want, even better when you add a conical ring to center the two pieces when you activate it.
But I am wondering if there isn't an option do fine with the magnet...

You say it lifts up when you clamp down.
I know this effect with wooden pieces well :(
Have you considered using a matal hinge or a simply pin type connection instead of a clamp?
Don't know your specifics though...

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Jack A Lopez
Jack A Lopez

11 months ago

Door holding electromagnets are designed to be on all the time.

I recall seeing several of these in a building I used to live in. In the event of a fire alarm, these electromagnets would turn off, and the doors would pull themselves closed, thus making it harder for fire to spread through the building.

I guess the point of my story is, those electromagnets were on all the time, like 24, 7, winter, spring, summer, and fall, for years and years, and I don't think we ever had any problems with them.