Step 5: Joining the sides- Making Tabs.

This is the part that can get a little tricky.  To make it a little easier to understand, take a look at my pretty crappy sketch in Picture 1.  You can see the sides, top, and bottom labeled.  The problem now is how to join any corner that isn't just folded.  For example, Side 1is going to get folded around and attached to Side 4.  Its really hard to glue edges together, so we need to make a TAB.  What is a Tab?

Tab:  A small flap of material on something used to hold things in place.

We need one tab for each corner that needs to be joined.  That means there will be 3 tabs for the top (not 4, because the top is already attached to one side), 3 tabs for the bottom, and one tab for Side 1 to Side 4.

The tabs will be the length of the side of each box, which is 2 inches.  They will only be 1/2 inch wide, and need to have tapered corners (a trapezoid).

Lets start with the tab on the end of Side 4.  Mark a parallel line 1/2 inch away from the end of the last square as shown in Pictures 2 and 3.  Remember to MARK TWO ARROWS and MEASURE TWICE!  The angle on the edges is 45 degrees.  This is very easy to do- a 45 degree triangle has two sides that are the same length.  We know the tab is 1/2 inch thick, so we measure down 1/2 an inch and mark an arrow.  Just one this time, see Picture 4!  Line up the arrow with the corner of the square and draw a line as shown in Picture 5.  Repeat for the other side- see Picture 6.  Picture 7 shows the completed tab!

Now we need 6 more tabs- 3 on the open sides of the top, and 3 on the bottom.  Start by marking an arrow 1/2 an inch out on one side of the top, then move to the bottom and mark another arrow.  Draw a line to make two tabs as shown in Picture 8.  Repeat for the other side  Repeat for the other sides of the top and bottom, then add another tab on the top of the top, and the bottom of the bottom.  Clear as mud!?  See Picture 9 for a clearer explanation.  You should now have a rectangle on each open side of the Top and Bottom.

Last thing to do on this step!  Put the angles on each tab like we did with the first one.  We have another little cheat here to speed things up though.  Pick a corner, mark your first arrow 1/2 an inch in like we did last time.  See Picture 10. Line up your ruler, same as before, and draw a line from the arrow to the corner of the square, but this time continue the line through the next tab as shown in Picture 11.  Two birds with one stone!  One arrow to mark two tabs.  Repeat for the other side of the tab.  The bottom of the tabs on the sides has to be done the old fashion way- Measure up 1/2 an inch, mark an arrow, scratch a line. All done!  See what it should look like in Picture 12.  Repeat for the Bottom square.

See Picture 13 for the completed drawing!

I use this same cube project in my classes but primarily to introduce students to object modeling/thinking in 3D. After introducing the assignment and getting students through this first cube, I challenge them further by having them create a 2.5" cube with a smaller 1" cube cut out of a corner and another project with a covered, sloping surface that's been 'cut off' 1" from the corner but still follows the same requirements. To see if they've mastered these design concepts, I have them make a final 3" cube out of a larger sheet of paper that has the corner cutout and sloping surface on adjacent corners. I'd also like to see your instructables on the inch and pyramid when you get them posted. Keep up the good work!
Why didn't you just use a straight edge and a compass? Geometry plays a large part in design and is visual- something the human brain does much more easily than numbers and measuring.
Because then the students wouldn't get to practice reading and using a ruler. I have a couple of other assignments- the "Perfect Paper Pyramid"- that we do use a compass on after they get a little better and finding those pesky numbers on the ruler. Also pretty hard to use a compass if you can't read the ruler to know what measurement to set the compass to.
Isn't that the truth. &nbsp;There are so many people who can NOT read a ruler or tape measure, yet it is so logical. &nbsp;Simple things like fractions of an inch. &nbsp;That the parts of an inch are:<br> 1.0 1 inch<br> 0.5 1/2 inch<br> 0.25 1/4th inch &nbsp;Notice they have divided an inch into 4 pieces on the ruler.<br> 0.125 1/8th inch<br> 0.0625 1/16th inch &nbsp;Or that for a 1/16th they have divided the inch into 16 parts.<br> 0.03125 1/32nd of an inch<br> 0.015625 1/64th of an inch<br> 0.01 1/100th of an inch<br> 0.001 1,000th of an inch<br> <br> Numbers are fun! &nbsp;You are doing a great service when you teach students how to measure things. &nbsp;We even divide a year into 365 parts and each of those parts (a day) into 24 parts (an hour) and each of those parts into 60 parts (a minute). &nbsp;We measure everything!<br> <br> Kudos.
Yup, its a great skill to have. I'll have to make an instructable for how I teach my students &quot;The Inch&quot;, as I call it. Easy way to draw out an inch and label the fractions, then use it as a calculator to reduce fractions too!
That is a &nbsp;nice looking cube. &nbsp;I like precision things like that. &nbsp;At my automotive machine shop we measure things within 10ths of a thousandths, &nbsp;but the way you measure the paper is something nice for people to learn also. &nbsp;Well done!&nbsp;
Great job. Good way to show students how to measure.<br><br>We did something similar to this, but we built bridges out of manilla folders. The most accurately folded and cut bridges held the most weight.
I'd like to know more about that! We do toothpick bridges in my Tech and Design classes, and have done spaghetti bridges in the past, but never a manila folder bridge!
Here is a link<br><br>http://bridgecontest.usma.edu/manual.htm
This is why I read commentaries!
I have a Canon A2e in my safe! &nbsp;If that is what your name is in regards to?
Cool! I have a Canon SX-30 that is cheap and effective.<br>No, &quot;A2E&quot; is a phonetization of a more complex alias that I use for myself, until now I had no idea of such reflex camera... anyway it is always good to know.
Yes, it came out in November of 1992 and with the vertical grip cost me about $1,200.00 without a lens on it.<br> <br> We had a very favorite dog that has now went to doggie heaven that we called A2e that was pronounced Ah Tu Ee. She is the white puppy taken in 1993 when I was building a small shop in my back yard. I never built the shop big enough, no room in it. :( Ani out rototilling our garden will give you an idea of how small it is. I should post some photos of what my shop looks like. There are a lot of people who post what their shops look like, but mine is so cluttered up and full of stuff that it is embarrassing.<br> <br> Ah, took me a little bit of experimenting to figure out how to add files. &nbsp;Always something new to learn.
Hi thoraxe,<br> <br> When you wish to post a URL link, click on the RICH EDITOR button at the top right &nbsp;corner of the reply box and it will allow you to make your links clickable. &nbsp;Right after the B &nbsp;&amp; I letters is the URL button. &nbsp;Click on it and a window will open that will allow you to enter your URL link. &nbsp;That will make your link clickable like below.<br> <br> <a href="http://bridgecontest.usma.edu/manual.htm" rel="nofollow">http://bridgecontest.usma.edu/manual.htm</a><br> <br>
<a href="http://bridgecontest.usma.edu/manual.htm" rel="nofollow">http://bridgecontest.usma.edu/manual.htm</a><br> <br> I always wondered how that worked.<br> Thank You
Sorry, I assumed it would hyperlink automatically. Like every other website.....
I took a drafting class in 1972. we made shapes on paper then cut them out. we had to be exact and they fit together with all the tabs inside. Out of sight. and all the edges had to be exact and all had to fit with out any gaps. That was part of our final. We were not allowed to use glues tape or other sealants. it had to hold it self together. Try doing this by making a ball. only 4 people passed that one. I was not one of the four.
I love this project! Reminds me of when my dad and I made a poster about diamonds when I was in middle school. He taught me to use a compass and straightedge to make a hexagon, and we worked from there to make a drawing of the crown and pavilion facets of the standard &quot;brilliant&quot; cut. :-) <br> <br>I'm curious about the &quot;hems&quot; you mention in the very last picture, on the note about the Pyramid shape. What are &quot;hems&quot; in this context? <br> <br>I'd love to see a follow-up Instructable about making the Pyramid!
A &quot;hem&quot; is another sheet metal term- kind of like the hem on your pant leg, you just fold the edge of the metal over on itself. Two reasons to do that- it strengthens the metal and also hides the sharp edge. I'll get that pyramid posted some time for you.
This is a great instructable! Thank you for sharing! I am in a class similar to this at school and I LOVE projects like this. This is a great way to teach basic skills of measurement.

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