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Batch o' Magnetic Bottle Openers

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Project by splintergroup posted 12-01-2021 03:37 PM 605 views 1 time favorited 13 comments Add to Favorites Watch

I’ve posted this type of project before, but they sell well and I’m always tweaking the design.

Before a rundown on the build….

About 10” tall and 4-1/2” wide, 5/8” thick.

Picture 1:
Cherry with a sapwood edge, paired up and spliced together

Picture 2:
Walnut, cherry. white oak. BB ply, poplar
White oak, fumed

Picture 3:
Walnut, cherry, maple, white oak, poplar.
Walnut, cherry white oak. maple.

Picture 4:
Purple heart, walnut, BB ply, lauan.

Finished with amber shellac and a poly top coat.

The build

These are pricey to make (i.e. low profit margin) and the most expensive component besides time is the magnets.
It’s a tightrope walk getting set up for a good grip on the fridge door and catching caps. I try to use computer hard drive head magnets but they do take some work to recover and install (see my previous build for some info on that)

Great project for ever accumulating small bits of thin wood. This is my current supply of walnut scraps, at least just those pieces short enough to fit into boxes (sorted by thickness)

Simple glued up stacks, shaped with a template.

Double sided tape holds the template

A quick waste removal at the 14”

Then a profiling at the router table.

A top/bottom bearing bit allows me to always be doing climb cuts and avoiding excess sanding on the curved edges.

An edge rounding completes the boards.

For catching the bottle caps, I make a recess from the rear so I can place magnets as close to the surface as reasonable. When I make openers with a veneered surface like last time, the recesses can be cut from the front and magnets installed level with the face. The veneer covers this all up leaving a thin barrier of wood.
The veneer method is easier for the magnet install, but then the wood needs something around the perimeter to hide the veneer edge

The magnets are 60mm x 10mm x 3mm and cost about $0.90 each. For maximum pull I’ll mount a pair on a strip of 1/8” x 1” steel strap.

A strip of scrap wire keeps the magnets apart. This method allows for a magnetic “circuit” to form when a bottle cap comes close to the magnets.

I create a pocket mid-plank to hold the magnets, drilling waste with a Forstner bit and then routing clean, leaving about 1/16” material to the board face.

To get a bit that can ride on my 1/2” BB template and cut the appropriate depth, I use a 1/4” spiral bit with a collar and bearing borrowed from a pattern bit. The template is oversized to compensate for the 5/8” bearing diameter.

The magnets that hold the opener to the fridge are 30mm x 3mm discs, 3-stacks of three with two stacks metal-joined at the top. The top is where the pulling away from the fridge door is strongest due to the torque from opening a bottle, so it gets the most magnets.

These are mounted in simple to cut 30mm Forstner bit holes, depth set so they end up flush with the back.

A pour of epoxy holds everything in place and is sanded flush before spray gluing on a layer of shelf liner (see the previous build for info on that).

Wouldn’t you know it that I ran out of the 30mm disc magnets and can’t find them anywhere near as cheap now!
They were 3/$1, so next time I’ll make a top magnet assembly identical to my cap catching unit. It’ll hold to the fridge a lot better and be cheaper 8^)

The opener itself is one of the many styles available everywhere for cheap. I really liked the “open-here” style used in my previous units as they were cast steel, rustic, and the cheapest of all, but whoever made the mold for these screwed up and got the angle wrong. This results in spilled beer which is just wrong! They can be fixed with some Dremel work, but then why bother, just use some better openers.

If you made it this far (even if you didn’t), thanks for dropping in!





13 comments so far

View James E McIntyre's profile

James E McIntyre

1666 posts in 2625 days


#1 posted 12-01-2021 04:18 PM

I read the description of each opener then clicked on its image. It was like following the bouncing ball. :-)

I was wondering how you were going to catch the caps. The magnets are a great idea.

Thanks for the tip of putting a pattern bit bearing on the spiral bit. I will definitely use that one.

As the years go by and my scrap pile grows. This idea will be a way to get rid of some of the pile and make some cool openers.

I can’t use them though, my fridge is Stainless steel.

-- James E McIntyre

View splintergroup's profile

splintergroup

6330 posts in 2555 days


#2 posted 12-01-2021 04:23 PM



I read the description of each opener then clicked on its image. It was like following the bouncing ball. :-)

I was wondering how you were going to catch the caps. The magnets are a great idea.

Thanks for the tip of putting a pattern bit bearing on the spiral bit. I will definitely use that one.

As the years go by and my scrap pile grows. This idea will be a way to get rid of some of the pile and make some cool openers.

I can’t use them though, my fridge is Stainless steel.

- James E McIntyre


Thanks for the comments James!

Stainless steel can still be attracted to magnets, just not as well. You can buy extra large magnets that’ll hold, they just won’t be very cheap 8^)

View GR8HUNTER's profile

GR8HUNTER

9309 posts in 2045 days


#3 posted 12-01-2021 04:30 PM

they are all very nice but pic 4 is very very nice GREAT JOB :<)))))

-- Tony---- Reinholds,Pa.------ REMEMBER TO ALWAYS HAVE FUN :<))

View Dave Polaschek's profile

Dave Polaschek

9309 posts in 1915 days


#4 posted 12-01-2021 04:39 PM

Pretty! Nice work, Splint!

-- Dave - Santa Fe

View doubleDD's profile

doubleDD

10913 posts in 3376 days


#5 posted 12-01-2021 05:20 PM

Really cool job splint. Still out of commission for awhile but these can be quick Christmas gifts in a pinch. I have many magnets and several openers so I’d be ready to go. I agree pic 4 with the baltic birch is super.

-- Dave, Downers Grove, Il. -------- When you run out of ideas, start building your dreams.

View therealSteveN's profile (online now)

therealSteveN

9383 posts in 1907 days


#6 posted 12-01-2021 07:32 PM

Keep that up, and you’ll be rich, and moderately famous. Nice work Bruce, classiest cap poppers I’ve seen yet.

-- Think safe, be safe

View mtnwild's profile

mtnwild

4723 posts in 4860 days


#7 posted 12-01-2021 07:38 PM

Great project, well done…

Those little projects can be real money makers…Grab and go…

-- mtnwild (Jack), It's not what you see, it's how you see it.

View VanDesignWoodworkin's profile

VanDesignWoodworkin

590 posts in 132 days


#8 posted 12-01-2021 08:19 PM

Great looking openers with a clever design!

-- "Wine gets better with age. Cheese gets better with age. It's not your fault that you're not wine or cheese."

View splintergroup's profile

splintergroup

6330 posts in 2555 days


#9 posted 12-01-2021 10:47 PM

Thanks guys 8^)

They do well at craft shows. priced to move. Hard drive magnets are “free” and work well for cap capture, but they have an odd shape so more work to install. Next batch should have the magnet investment down to $5 or so, progress!

View swirt's profile

swirt

7092 posts in 4305 days


#10 posted 12-02-2021 02:50 AM

A nice collection of openers, and thanks for the extra build details.

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

View Brodan's profile

Brodan

457 posts in 2635 days


#11 posted 12-02-2021 11:09 AM

Those came out great. I really like the contrasting woods. I agree they are the classiest top poppers. Thanks for the details on the magnet configuration.

-- Dan, TN

View Jim Jakosh's profile

Jim Jakosh

27240 posts in 4438 days


#12 posted 12-04-2021 06:42 PM

Nice work on the openers, Bruce…............Cheers,, Jim

-- Jim Jakosh.....Practical Wood Products...........Learn something new every day!! Variety is the Spice of Life!!

View mafe's profile

mafe

13652 posts in 4422 days


#13 posted 12-11-2021 12:15 AM

Cheers!
A joy to follow your work methods here.
Best thoughts,
Mads

-- MAD F, the fanatical rhykenologist and vintage architect.

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