When kids in grade 6 walk into the woodshop for the first time they have already heard about the project from their siblings and are SO excited to get started.
So here are my learning objectives:
-The students will learn to creatively solve a problem within a set of guidelines.
-The students will learn to measure, apply the measurements and create a cutlist
-The students will learn to safely use a drill press and a scroll saw.
-The students will learn to effectively learn to glue.
-1/4" square graph paper.
-3/8" MDF 8.5" by 11"
-1/4" wood strips 3/4" by about 3' per student
-7/16" steel ball bearing. (per student) You can get these from electric motor rebuild places or just look under bearings in the 'pages.
-12" Forstner bit
-Sanding board. (or just plain 120G paper sheets)
Submitted by HD Stafford Middle School for the Instructables Sponsorship Program
Step 1: Starting the Design
I goto the board and start drawing a big rectangle than ask for where a start and finish should be. Than i ask the kids to describe paths from start to finish... the catch is the line can't touch or cross. Often i'll get kids to come up and draw paths as well. Eventually i guide them to a design thats interesting but not too twisty. They all say "thats TOO EASY!!" so i ask them to make it tricky by adding holes... They quickly figure out that holes placed in the right spots.... at the end of long runs or on the outside of a curve or in a way that makes the ball have to curve back and forth... make it tricky. Than i ask HOW we're going to make sure the ball follows the path... The kids figure out that walls will control the ball.
I set them all up with pages and say that i want 4 different paths with walls and holes all quick sketched in 20 minutes. They freak out and ask for more time. I say "NO WAY!" and yell GO!!! They love that its kind of a race...
This gets their brains going.
At the end of the 20 minutes (or whatever they need... i fudge it...) i say to stop and give them rules... i write them on the board...
Choose 1 and use the graph paper to draw it.
-All up/down and left /right. No angles. (tough to build)
-The ball takes up a space of 4 squares. So do the holes. This means that they must allow space for the ball to roll around the holes.
-The walls take up 1 square wide. The kids have to allow room for the walls.
-You have to allow at least 3 squares wide in between walls.
I than get the kids to start a rough but accurate drawing of the path.
They than add the walls roughly. check out the pictures...
Step 2: Adding Details
By now they start drawing in holes which is good because its the next step... I draw the holes as being 2by2 squares...4 total. They start to sketch in the holes which usually brings up problems such as "How will the ball fit by?" Usually they will need to combine walls that are next to each other into 1 wall or even start over. I won't let them rip up or throw away pages because its all part of the process.
Once they are happy with their drawing They bring it to me and i look for areas that might be a problem. If they need to make changes now is a good time! If the drawing is ready I sign it somewhere inconspicuous. (for marking later)
Step 3: Transfer the Design
Use the ruler and pencil to draw in all of the drill holes. Than i usually get a sharp piece of wood and use it to (invisibly) draw a big smiley face.
I ask the kids if they wan to see whats under the page so i lift it and they see the big smiley face. They LOVE it. Easily impressed i tell you.
Than i start drawing all the walls that are vertical... checking once in a while to check progress. Once i get all the vertical lines done i do all the horizontal lines.
once the drawing is done i pull off the paper and remind them to NOT throw away the design. It is worth 10% of their grade. This motivates some kids to keep work...
Step 4: Start Measuring The Walls
In the photos it shows what i do now which is to lay the wood next to the MDF than mark all the wood piece sizes. Make sure they label all the pieces! I had a kid last rotation who had 42 pieces. Turned out well thankfully!
I use 1/4" cheap plywood i had around.. Cut it out with a tablesaw into 3/4" strips. If you have the materials and want to get fancy use some solid wood. Gets expensive though.
Step 5: Cutting the Walls
I like to introduce this step the class before the drill demo which takes less time... This gives the kids lots of jobs to do... measuring, cutting and drilling next day. I find that if i do all of the demos in one day smoke starts coming out of their ears...
Step 6: Drilling the Holes
Once the holes are drilled flip the board and show the kids how just the tiny tip has gone through... put the board down, carefully line up the tip of the drill with the pinholes showing through and drill. This is the cleanest way to drill through MDF with a drill bit. The kids really like poking out all of the little disks that are left in the holes...
As a side note for demos... I have REALLY big classes... 30 kids... what i do is get all of the kids with short stools to sit around the machine, short kids standing behind (i'm a short guy so i make a joke or two about it...) and tall kids standing at the back. This arrangement usually works. I make sure kids are not hiding and tuning out of the demo. I usually get at least one huge kid standing right in front... i suggest that maybe he/she is not such a good window...
Last step for the holes is to rip a small square of sandpaper and smooth the holes. After drilling, a small lip usually develops which stops the ball from rolling in..
Step 7: Gluing and Finishing
Use a piece of wood to remove any sqeeze-out.
Draw a path for the ball to follow.
Give out 7/16" balls. This sounds a bit... controlling... but i note on a list who got bearings because the kids lose them really really fast than come back for more. I've had classes go through 60 balls.
Here's a marking sheet. I use... here's some fancy words for you... criterion referenced assessment... basically its a set of criteria that students can follow so they know what grade they will get. I always encourage kids to take a mark, fix any issues, than come back for re-marking. I like to give kids the chance to get the best mark they can. It also is very objective which is a criteria for marking in our district and in woodworking it really an be hard to not be subjective!
Thanks for checking out my instructable! try this project in class or as a fun project on your own. go crazy with designs... multiple levels, bridges, tunnels... have fun!
Labyrinth Marking Sheet
NAME:_______________________________DIV:______ GRADE: /60
No drawing. Drawing but NO signature from me (lost but re-drawn?)
Drawing similar to project. Clear lines, carefully done with rules in mind
Exactly like project.
Perfect lines with ruler, all rules followed carefully
Missing, on angles, no sanding glue mess sqeeze out
Horizontal and vertical lines, square cuts, sanded okay, some glue marks showing
Perfect walls perpendicular and smooth, carefully glued and wiped
Missing, not like drawing, not drilled front to back (flipping) Unevenly drilled… back to front does not line up.
Holes all there. Rough in spots but most line up and are briefly sanded. Similar to drawing
Exactly like drawing.
Smooth and sanded well, line up perfectly.