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Millimeters, Inches, Fraction, Decimals

inches mm
1/16 0.0625 1.5875
1/10 0.1 2.54
1/8 0.125 3.175
3/16 0.1875 4.7625
1/4 0.25 6.35
5/16 0.3125 7.9375
3/8 0.375 9.525
7/16 0.4375 11.1125
1/2 0.5 12.7
9/16 0.5625 14.2875
5/8 0.625 15.875
11/16 0.6875 17.4625
3/4 0.75 19.05
13/16 0.8125 20.6375
7/8 0.875 22.225
15/16 0.9375 23.8125
~ 1.0 24.5

Handy chart for conversion between stupid Imperial units (fractions and decimals) and smart Metric units.

See Also: Mixing Imperial and Metric and Screw/Bolt Diameters

Get to this quickly using p2url.com/inmm

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Floyd Loves Clamps

The Floyd Leg

You may have seen The Floyd Leg somewhere online, maybe from the Kickstarter campaign that pulled in over $250,000, or perhaps Instagram or Pinterest?

It’s an interesting take on table legs, and well executed. From a marketing standpoint, I like the story they’re telling. (And I’m a jaded marketing expatriate!)

The thing I like about The Floyd Leg is not that it’s the greatest idea ever, but that it’s an idea that became a product that became an ecosystem of inspirational way to use the product.

I mean, take a look at these c-clamp legs I spotted at ReStore a few days ago:

C-Clamp Legs

Chances are good that some guy in his workshop said “Dang! I need some tables legs… well, here’s a few c-clamps, and metal pipe, and I’ve got a welder…” and then, bam! C-Clamp Legs!

The “C-Clamp Legs” didn’t become a product, or have a campaign where you could pre-order them, or a web site with lovely photos and videos, or any social media accounts. The C-Clamp Legs just solved a problem someone had.

Sometimes making is about solving your own problems, and sometimes making can be about solving problems that others have as well. If you can make money doing the latter, good for you!

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Press-Fit Construction

Stabuilt Blocks

I’ve been looking into press-fit construction techniques for a while now, and I stumbled across this 1917 building set “The Embossing Co Stabuilt Blocks” yesterday. (Nice font, eh?)

Stabuilt Blocks

It consists of a bunch of wood blocks with round round holes and pegs that hold them together. (I know you’re probably thinking I’m a big fan of LEGO, or maybe TINKERTOY. You’re half right. I’m more interested in the design of these things, and in making my own than I am in building things with them. I’m weird like that.)

Stabuilt Blocks

I didn’t examine all of the pieces, but one of the longer pegs looked a bit off with the cuts on the end. Maybe many were off like that? It almost gave it a DIY look. The DIY aspect is what I liked about this set. You could (somewhat) easily make one of these yourself if you had access to a basic wood shop.

With digital fabrication techniques you can easily create your own press-fit set. In fact, it’s a thing. For MIT’s “How To Make (almost) Anything” class one of the assignments is press-fit construction.

Vincent Chow's Desktop Organizer/Decorative Art Piece

There’s not a good master index, but you can browse through some of the student work from the past years and stumble across their press-fit assignments. (2014, 2013, 2012, 2011, etc.)

If you don’t get lost in all the documentation of other interesting projects, check out this Fab Academy page about press-fit construction, which has even more links at the bottom.

I’ve got a few projects for 2015 that will rely on press-fit pieces, so if you’ve got any good links, send them my way!

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Pop-Up Go(at) Controller

P.U.G.C.

I’m not sure the world needs (or is ready for) the Pop-Up Go(at) Controller, but I’ve built it. I know, I know, I can hear you asking “What is the Pop-Up Go(at) Controller!?” Well, here’s the story.

Back in August I posted about the Milwaukee Public Museum’s snake on the Milwaukee Makerspace mailing list. Seems the snake was in need of repair, so I asked people how they would build a snake. Shane suggested that the space should have a pop-up goat, and thus, I had to build a pop-up goat.

I mean, I didn’t have to, but one thing I’ve discovered over the past few months is that my work tends to be reactionary. People say things, or do things, and it prompts me to make something. So I made something.

Milwaukee Makerspace

I didn’t really make what Shane suggested, but I took the basic idea and did my own thing. I started with a photo of Milwaukee Makerspace I took last year. This would serve as the backdrop for the piece.

Goat

I dug around for a nice picture of a goat I could use, but as luck would have it, my daughter Madeline (also a photographer) recently shot a goat (with her camera!) so she allowed me to use her photo.

P.U.G.C.

The construction of the piece was done using MicroRAX, which is an Aluminum extrusion-based construction set. I’ve had some lying around for a while, so it was good to put it to use in a project. It cut easily with a hacksaw and bolts together using a few screws and plates.

P.U.G.C.

The goat attaches to a servo thanks to a few magnets. The image of the building and goat are photos I had printed, and then attached to some paperboard. The building slides into the slot of the MicroRAX.

P.U.G.C.

The servo mounted easily to the MicroRAX, and things are adjustable, so if I need to slide the servo up or down or left or right, that’s easy. Same with the front pieces that hold the building photo in place. I like to plan things to be interchangeable and adjustable when possible.

P.U.G.C.

There’s an Adafruit Perma-Proto Board on the back, along with an Adafruit Trinket microcontroller to make things happen.

P.U.G.C.

There’s a few screw terminals to allow for connection of power (AC adapter or battery) and a button to activate things. I typically build button enclosures, but for my silly project I decided to use a giant heavy metal electrical box with an old industrial push button. It’s so much overkill it hurts.

White House

As mentioned, I wanted the P.U.G.C. to be extensible, so here’s another idea for it. I can swap in a photo of the White House, and a surface to air missile. Ka-Boom! Smite thine enemies! ‘Merica says “Take That!!!” and so on…

Mac Flag

Or maybe you believe it’s more fun to be a pirate than to join the navy? Just enable “flag waving mode” and you can fly your freaky colors of freedom above the original Macintosh. Mr. Jobs would be so proud! Or angry.

And yes, the ‘at’ part in “Go(at)” is meant to be dropped as needed so this becomes the Pop-Up Go Controller. I can also hear you saying, “Those are some awesome photos, but is there video of this P.U.G.C. in action?” Well, of course there is!

Pop-Up Go(at) Controller from Pete Prodoehl on Vimeo.

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Iterate, iterate, iterate.

iterate

The Golden Rule from Phillip Burgess at Adafruit Industries: Iterate, iterate, iterate.

Don’t be discouraged when your case doesn’t work on the first try. Or the second. Once I thought I’d nailed a design on the third try, but was wrong. The most extreme has been our Pi Box enclosure for the Raspberry Pi…this took 23 attempts to get just right! The first few didn’t even hold together. Other projects were initially so discouraging, one was known behind the scenes as the “Piece-o-Crap-o-Tron 9000” …but many attempts later it’s become one of my favorite kits.

Fail quick, fail hard, fail often. Failure is part of the process — perhaps even key to the process. It’s how we learn and improve, and ultimately make a better product. Make mistakes now so your customers don’t have to.

I’ve known for a long time that design is an iterative process, and sometimes I think that’s what I love about it. I tend to be a fan of the process.

I remember once I asked Michael Curry how many attempts it took him to design something and 3D print it before it worked. I thought he said “two or three times”, but maybe he really said “twenty three times”. ;)

But seriously, there’s a lot of great tips not just for laser cutting things, but for designing things in general.