model joint for Ultimate Ascent Pyramid
by engunneer, published
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Summary
This 1:8 scale model might help you think about how to climb the pyramid in FRC's 2013 event - Ultimate Ascent
Instructions
Print 12 copies of this part - I had to open up the holes with a 3/16" drill bit for a good fit.
Cut 4 each of the following lengths of 3/16" dowel
13"
3.125"
6.25"
9.375"
Assemble as shown in the finished model, which is based off the team drawings for the pyramid.
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I would like to give a huge thank you to engunneer for sharing this! It's fantastic and easy to build! :)
My learnings:
The angled holes are so close to 3/16" that you can just ream them out easily by hand (slide the reamer in to the hole and twist with your fingers).
Mark the 13" dowels with a sharpie marker where you want the rungs to sit.
To assemble:
Start by gluing the top smallest square together (krazy glue works great for aluminum and plastic bonding). Make sure the square is flat.
Assemble the pyramid upside down: Place the small square upside down on the table (it should be stable now that you've glued it) and put the 13" legs into the angled holes on your small square. Put Krazy glue around the gap between the 13" leg and the plastic bracket. Gravity will pull the glue into the gap, so you don't need to take the leg out of the plastic to do this.
Slide a plastic bracket onto each 13" leg and put the connecting dowels in. Use Scotch tape to hold the plastic bracket to the rung, and make sure the tape is not touching the 13" leg. This will allow you to slide this middle-sized square up and down into position later.
Slide a plastic bracket onto each 13" leg again and put the long connecting dowels in. Use Scotch tape to hold the plastic bracket to the long connecting dowls, again making sure that the tape is not touching the 13" leg.
Now it should be safe to turn the pyramid right side up. Adjust the height of the two lower levels to your liking. I would suggest using a tape measure and a level so you don't get a funny gap like I did.
Once everything is adjusted, take the Scotch tape off of one angle bracket. Run a bead of Krazy glue around the gap between the rung and the plastic bracket. Again, you don't need to remove the rung from the bracket. You can let gravity pull the Krazy glue in.
Repeat until all the tape is off, and you're done!
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