Gopher Hole Puzzle

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Introduction: Gopher Hole Puzzle

About: I like to design and build random things.

This is a fun little puzzle that goes by the name of Golf, Nine Hole and, my favorite, Gopher Hole Puzzle. The goal is to fit all six pieces into the box. The possible combinations make it pretty challenging. As for the build, it was fairly easy to make, if you have patience. I used doll pin stands from the craft store for the pegs. The most common version of this puzzle uses wood balls as shown here.

The solution is shown below.

Animated Solution

I've also included STL files (last step) for a 3D printable version for those that are not up to woodworking.

Supplies:

Tools:

  • Table Saw
  • Drill Press
  • Forstner Bit, 1.125"
  • Router Table (optional)
  • Wood Clamps
  • Sander
  • Ruler
  • Pencil

Materials:

Teacher Notes

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Step 1: Drawings

You will be building these parts.

Step 2: Housing

The housing consists of a bottom and four sides.

Step 3: Top/Bottom

The bottom sets the size of the overall puzzle. I arbitrarily chose 5" x 5". For thickness, I had a scrap piece of cedar that was 3/4" thick so everything is made to that size. You will need to make two of these parts. Note that the top piece will need to be sanded down a bit to fit into the housing.

Step 4: Holes

I marked the centers per the drawing. Next, I used a 1.125" diameter Forstner bit to drill the holes. To prevent breakout, I didn't drill all the way through from one side. As soon as the tip of the bit broke through, I flipped the piece over and drilled from the other side.

Step 5: Chamfers

Since I was worried about lining up the holes in the puzzle, I added a chamfer to each hole using a 45-degree router bit. That chamfer along with the existing chamfer on the doll pin gave me confidence that everything would fit.

Step 6: Sides

Making the sides are straight forward. I used a table saw for these cuts. I'm sure more talented woodworkers could improve these parts with miter cuts or dovetails.

Step 7: Assemble Housing

Attach the sides to the bottom using wood glue and clamps. Sorry for no pictures of the clamping. If it isn't obvious, refer to one of my many other puzzles for pictures.

Step 8: Pins

The pins were purchased from a local craft store but can be purchased online as well. Wood balls, marbles, dowels or other items could be used as alternates. I considered scaling it up even larger and using golf balls for the pins. I would suggest finishing (paint, stain, etc.) the pins before attachment.

Step 9: Part 1

All the piece parts will need to fit into the housing. Note that dimensions shown assume a perfect fit inside the housing which isn't feasible. Therefore, for each part, the overall dimensions will need to be reduced slightly to get a good fit. I took about 1/32" off each side using a sander which worked out pretty well.

As with the bottom, I used the drill press and a 1.125" diameter Forstner Bit to drill the holes. For marking the center hole, I drew an X corner-to-corner. I measured off the outer holes per the drawing. Hole depth was an iterative process. For the doll pins, the depth required to reach the chamfer turned out to be 0.28". Tip: Start with Part 4 and use the through holes as a guide for the remaining parts.

For all the blocks and housing, I finished each with Danish Oil after sanding and wiping them clean.

I painted my pins ahead of time with spray paint. I then glued them to the blocks as shown. I didn't like the center hole from the Forstner bit so I used craft paint to fill in the center hole.

Step 10: Part 2

Use the dimensions from Part 1 for hole locations.

Step 11: Part 3

You will need to make two of these parts.

Step 12: Part 4

This part has two through holes. I would start with this part and used it for a guide to line up the holes on the other parts.

Step 13: Part 5

Last part.

Step 14: Part Recap

You should have these parts when you are finished.

Step 15: How It Works

This picture shows the internal parts and the clearance in the holes.

Step 16: Pictures

I'm happy with how it turned out.

Step 17: 3D Print Version

I modified the files for the correct fit and made a few other changes to reduce print material. Please post a picture if you printed the puzzle.

Thanks for viewing!

1 Person Made This Project!

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3 Discussions

0
donciccio
donciccio

6 weeks ago on Step 17

Hi, sorry to ask, but am I missing a six section of wood ?

1
mtairymd
mtairymd

Reply 6 weeks ago

No problem - I thought that might be a little confusing. Part 3 is used twice. I tried to demonstrate that in the overview step with the (x2) note. The animation video also shows it twice.

0
donciccio
donciccio

Reply 6 weeks ago

ok, thanks