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Coaster bottle opener

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With Spring here many people are enjoying the the warmer weather, spending more time outside enjoying a cold one on the patio with friends. A common conundrum when entertaining friends is keeping the bottle opener from wandering away; unless you have the bottle opener chained up it's bound to get lost at a social.

Never be far from an opener to crack your next beer, all while keeping water rings off your tables. This bottle opener is cleverly placed under your drink coaster, making a few ensures that every guest has their own opener.

This easy woodworking project requires a biscuit cutter to make, but you might be able to make do with other tools. These coasters can be personalized, and they are infititly useful


In case the video wasn't enough; let's make!
 
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Step 1: Cut wood stock to size

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The wood thickness is determined by the height of a bottle cap, plus an allowance for the screw to bite into the wood. I made these coasters from 3/4" thick plywood, it's about the minimum thickness for this method of construction.

Using a table saw I ripped the wood plywood stock into 3.5" wide strips. These strips were taken to the chop saw next and cut into 3.5" sections, leaving a square blank which will be milled.

Step 2: Mark midpoint on one edge

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We'll be using a biscuit cutter to make the indentations in our coaster bottoms. To know where we want to cut we'll need to find the midpoint along on edge of the square blank to line up with our cutter. Since my blanks are 3.5" my midpoint is 1.75".

Using a pencil a mark was made.

Step 3: Mark depth

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With the blank in profile, a cap bottom was aligned with the bottom of the coaster blank and a mark was made at the top of the cap. This much wood will need to be removed to allow the screw to grip the cap and pry it off without having the screw protrude past the bottom of the coaster.

Step 4: Buscuit cutter

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A biscuit cutter is used to cut a small slot into wood. Typically they are used to cut slots which allow a biscuit (a small thin piece of wood) to be inserted which joins two pieces together. For this application, we'll be using the biscuit cutter to remove a small section of wood from the bottom of our coaster by making a series of cuts on top of each other, creating a cavity.

before cutting the depth needs to be set on the biscuit cutter. You'll want to make a cut that's deeper than about half the diameter of a bottle cap. Most bottle caps are about 1" in diameter, so your cut will need to be a little larger than 0.5" deep. Once the depth gauge is set on the biscuit cutter we can start cutting.

Clamp a coaster blank to a sturdy work surface with the midpoint mark accessible. Lining up the midpoint mark with the centre guide of the biscuit cutter, plunge into the wood. Leaving the biscuit cutter flush against your work surface, shim the coaster blank with a thin piece of wood and clamp down again. By raising the coaster blank and repeating the biscuit cut you'll have made another cut right on top your previous cut, enlarging the opening. Repeating this process with larger shims will allow you to make a uniform cavity in the coaster blank.

Using a sharp utility knife clean up any burrs in cavity. Then use a medium grit sandpaper (~200 grit) to make a smooth surface.

Step 5: Screw

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Screws come in a wide variety, for this opener we'll need a screw that has a flat underside. Tapered screw heads will not grip the bottle cap and are not suitable.

I used 1/2" dome flat-headed screws, but any screw with a flat underside will work.

You could get away with just using one screw, but by using two you get a better connection with the bottle cap and there's less positioning when trying to open a bottle. Using a drill, two small pilot holes were drilled and the two screws were installed near the apex of the curved cavity. Ensure not to screw too far into coaster, else your screws will protrude out the top of the coaster.

Step 6: Optional: embellish

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You could leave the tops of your coasters blank, but not embellishing this space seems like a waste

To personalize these bottle opener coasters I decided to etch the top. You could do wood burning, decoupage, or paint. I have access to a laser cutter so I decided to use it to etch an image onto mine - a simple beer bottle and can with a note letting you know there's a bottle opener hidden underneath.

Step 7: Finishing

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Before you can use your coasters you'll want to finish them with a sealant so they don't get damaged with use from wet bottle condensation. I finished my coasters with Danish oil, a tough water-resistant finish that can be applied with a rag.I love the easy application and rich colour it gives wood.

Step 8: Crack a cold one

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Once the finish has dried your coasters are good to go! Make a few and have them around at parties, and personalize them to suit your style.

Cheers!


Have you made your own coaster bottle opener? I want to see it!
Share a picture of your version of this project in the comments below and be awarded a 3-month Pro Membership on Instructables.com and a digital patch.
jma5097 made it!2 months ago

While I do not have a biscuit cutter or a laser engraver, I did make a poor mans version. I used a 2" Forstner Bit, to make the slot, I did this by making a 7" x 3.5" piece of 3/4" plywood and I drilled the 2" Forstner bit deep enough for the screws about 3/8" deep. I cut that in half to make 2 coaster, attached the screws and used a wood burning tool to make the design.

Thanks for idea, this made a great birthday gift for my brother!

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agis683 months ago

No doubt its excellent use of woodparts etc....BUT!!!

Its also time to give an idea to administration to separate all these instructables where machine expensive machines take place and involved with the object. The reason is simple....I can't compete all these guys have money enough to spend to buy or even rent any of these expensive machines.

So please take ithis advice under your consideration. I have excellent ideas (like most here) but with luck of money i can't execute so perfect if i had a lazer engraver or any cnc macchine....tell me your opinion on this

dan30083 months ago

Was just wondering what to do with the spare bits of wood i have upstairs. Time to make some custom coasters. Now i just need a laser engraver...

Bilou3 months ago

Nice stuff... Instead of two screws, I've seen someone using a countersunk washer and a screw for the openning lever... It look awsome too... you may want to try it out...!

https://www.facebook.com/LaBizounerie/photos/a.542745519136079.1073741827.418960574847908/544358075641490/?type=1&theater

depotdevoid3 months ago

Very nice, this looks awesome!

elicitone3 months ago

That is an awesome Idea... and just in time!My Dad had me designing some Coasters to be made on his CNC machine. After seeing this, I have to rethink my design! :)

Now this is how you write an instructable. Simple idea, illustrated with clear pictures in the proper sequence and attention to grammar and spelling. Everything you need to know and nothing you don't. This ought to be an example for newbies in the FAQ somewhere. Well done.

Nice project!

blueangelical3 months ago
Think you need to approach Firebox.com with your excellent gadget ideas ;-)
rimar20003 months ago

Nice design!

hunter9993 months ago

Wow! Your full of ideas, awesome Instructable - very well documented. Thumbs up for Mike again for another amazing 'Ible! :-)

Voted!

eschmith3 months ago

I absolutely love the instructable and the design of the top of the coasters. I do however think that those 2 screws don't look great, and will probably rip off of the coaster in no time. Though I'm not a woodworker, I'd probably take two squares (each half the thickness), still cut out the curved opening, but route a shallow square or rectangle on the "inside" surfaces of one or both halves and insert a sturdy bit of flat metal stock to act as the lip which would catch the cap. Drawing attached with dotted line showing area that I would route out to hold the stock. Then I'd epoxy or wood glue the remaining 3 sides together.

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mikeasaurus (author)  eschmith3 months ago

Thanks! The screws have plenty of bite in the wood, they're not going anywhere.

I considered a laminated approach (per your picture), but decided to try this way. You should post an Instructable on your version trying it out!

Mrballeng3 months ago

This is great. And way to set the bar for an instructable. I applaud all the camera angles, the gif, and text on pictures.

mikeasaurus (author)  Mrballeng3 months ago

That's some high praise coming from you, sir. Thanks!

JonnyBGood3 months ago

You sir, are a genius! You have combined two elements that should have been combined a long time ago and I thank you for it. I also liked the instructions within the picture and I plan to try that back in the knex section.

mikeasaurus (author)  JonnyBGood3 months ago

Glad you like it!

Hi there, I am a great fan of your work. You've really outdone yourself here. Thank you for posting!! And as a side note, you miss spelled finishing in your step 6 title
mikeasaurus (author)  TheWhiteKnight3 months ago

fixed!

Cool!!

Sorry step 7
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