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DIY Magnetic Switch

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Project by George_SA posted 06-19-2019 12:56 PM 910 views 11 times favorited 9 comments Add to Favorites Watch

A while ago I made a feather board that attaches to my table saw with a magnet. Taking it off is a bit cumbersome however. The ideal would be one of those magnets that turns on and off. I found a DIY version on YouTube uploaded by Andrew Klein. In Andrew’s video where he makes a 3D printed version he also gives an explanation on the principle of how this works.

I decided to also make such a switch, which I could be use to attache and detach a feather board or other jig on my Table Saw. I only had 4 rare earth magnets and so I decided to make a simpler version. I also made a video demonstrating how my DIY magnetic switch works. Even with just 4 magnets it is still quite strong picking up my 4lb hamer quite easily. It also attaches quite strongly to my table saw. For my purposes it seems that 4 magnets will do the job quite well.

How does it work?
Here is my attempt at explaining it. Also look at Andrew’s video to see how.

Diagram explaining how the magnets must be set up

When building the switch, it is important to get the polarities of the magnets right. On the 1 pin the N pole must be in contact with the innermost steel pin. On the other pin the S pole must be in contact with the innermost pin so that when you rotate the switch the N & S poles can be aligned or a N Poles be aligned.

It is also important that the mating services are quite flat so that they come in contact with each other for the switch to work well.

Thanks for watching.

-- Sometimes life gets in the way of one's woodworking :)





9 comments so far

View swirt's profile

swirt

3971 posts in 3393 days


#1 posted 06-19-2019 01:14 PM

Clever work George_SA. I can see that being very handy.

-- Galootish log blog, http://www.timberframe-tools.com

View LittleBlackDuck's profile

LittleBlackDuck

2854 posts in 1242 days


#2 posted 06-19-2019 01:14 PM

Thanks for this handy post G_SA. I’ve been a fan of mag switches since I discovered them about 15 years ago.

I’ve spent a small fortune on my collection and with this post and Andrew Kleins I’m probably gonna go ape’s making a swag of them… Noted with interest the 3D printer version as I have the luxury of one.

Thanks again.

PS. The picture of the diagram is a bit fuzzy to read properly… any chance of a link to a PDF file?

-- If your first cut is too short... Take the second cut from the longer end... LBD

View George_SA's profile

George_SA

410 posts in 2635 days


#3 posted 06-19-2019 03:18 PM


.........

PS. The picture of the diagram is a bit fuzzy to read properly… any chance of a link to a PDF file?

- LittleBlackDuck

With a 3D printer available, you will be able to make quite a few more :)

I redid the diagram to give a clearer picture (I,m not sure how to insert a PDF file)

-- Sometimes life gets in the way of one's woodworking :)

View kiefer's profile

kiefer

5658 posts in 3089 days


#4 posted 06-19-2019 03:45 PM

How hard is it to move sideways ?

-- Kiefer https://www.youtube.com/user/woodkiefer1/videos

View lightweightladylefty's profile

lightweightladylefty

3358 posts in 4134 days


#5 posted 06-20-2019 05:50 AM

George,

I like your simpler version. It seems like it works amply well. Thanks for sharing.

L/W

-- Jesus is the ONLY reason for ANY season.

View George_SA's profile

George_SA

410 posts in 2635 days


#6 posted 06-20-2019 09:52 AM



How hard is it to move sideways ?

- kiefer

It is not to hard too move. My 10mm dowel hinge is a bit tight fitting which I could loosen a bit. When you turn the switch there is a shearing action which makes that it is not very difficult to overcome the magnetic attraction on the pins.

I’m working on a more compact design as this version seems a bit bulky.

-- Sometimes life gets in the way of one's woodworking :)

View dannmarks's profile

dannmarks

931 posts in 1003 days


#7 posted 06-20-2019 10:16 AM

Love it

View crowie's profile

crowie

3099 posts in 2372 days


#8 posted 06-21-2019 10:53 AM

Very clever sir!

-- Lifes good, Enjoy each new day...... Cheers from "On Top DownUnder" Crowie

View LittleBlackDuck's profile

LittleBlackDuck

2854 posts in 1242 days


#9 posted 06-23-2019 12:06 PM



I redid the diagram to give a clearer picture (I,m not sure how to insert a PDF file)
- George SA

Thanks G’_SA, didn’t thank you earlier as the notification finished up in my junk folder._

-- If your first cut is too short... Take the second cut from the longer end... LBD

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