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When I first saw M3G's Instructable, How to Drill Straight Holes with a Hand Drill (Using Lego), I was impressed with the simple elegance of such a straightforward idea. It was one of those ideas that you kick yourself for not thinking of it.

I did think there was some room for improvement, so here is my stab at it. I added some tabs on the outer corners to allow a place to hold the guide. Also with the proper placement of different thickness and widths of blocks, it now can guide the drill at four different angles. It is small enough to not need glue to hold it together which allows pieces, damage by use, to be replaced.

Step 1: Acquire the Blocks

You will need:

4 - 2 x 4 bricks
2 - 2 x 3 bricks
2 - 2 x 2 bricks
1 - 1 x 2 bricks
1 - 2 x 2 plate
2 - 1 x 2 plates

I went to raid my Granddaughter's Lego stash but she quickly explained to me that that would not be acceptable. (Her actual words were, "No Papa, mine, go away!" So I bought mine, used, from a local brick seller (Fallout Games Tempe AZ) and paid 8 dollars for enough pieces to make eight of these.

Step 2: First Layer

Lay out a 1 x 2 brick, two 2 x 4 bricks, and a 2 x 3 brick as shown in the photo. You can picture the two arms with the two finger tabs.

Step 3: Add a Second Layer, Then a Third Layer

The second layer consists of a 2x 4 brick and two 2 x 2 bricks placed on top of the first layer as shown in the photo.

The third layer consists of a 2 x 4 brick and a 2 x 3 brick placed on top of the second layer as shown in the photo.

Step 4: Add a 2 X2 Plate to the First Layer

Place the 2 x 2 plate at the open position on the first layer arm as shown in the photo.

Step 5: Add 1 X 2 Plates to the First Layer

Attach the two 1 x 2 plates at the open position on top of the first layer of the other arm, as shown in the photo. The guide is now ready to use.

Step 6: Drilling a Straight Hole

Place the bit in the inside corner, making sure it touches both sides.

Step 7: Drill 45 Degree Holes

The end of one arm has a notch the is 16mm wide and 16mm (9.6 + 9.6 - 3.2) tall. This makes a 45 degree angle when the drill bit touches both corners.

Step 8: Drill 40 Degree Holes

This tab has a notch that is 8mm wide and 9.6mm tall. This makes a 40 degree angle when the drill bit touches both corners.

Step 9: Drill 22-1/2 Degree Holes

This tab has a notch that is 8mm wide and 19.2mm (9.6 + 9.6) tall. This makes a 22-1/2 degree angle when the drill bit touches both corners.

Step 10: Drill 30 Degree Holes

This arm has a notch that is 8mm wide and 12.8mm (9.6 + 9.6 - 3.2 - 3.2) tall. This makes a 32 degree angle when the drill bit touches both corners. But move the bit about a 1/2mm away for the top corner and you now have a 30 degree angle.

<p>Now to find and raid the Lego bins! Super useful for the angles!</p>
Really cool idea!
<p>man, great tip. this will work in a pinch. thanks</p>
<p>when I first saw this I instantly realised how useful it would be in a drill press, not to drill straight, but to drill so that the hole would st exactly in the corner of a squared shape I want then to cut out. As long as the block sits exactly on the lines of my cut out shape, the drilled hole should be good.</p>
<p>Make sure you use a nail to punch a small dent where the drill bit is supposed to center on so it has a grip. This will keep the bit from traveling and will give a bit more secure edge.</p>
<p>Seems like it would be just as easy to get a short piece of 2x4 and a ruler, draw some appropriate lines on it and drill holes through it. The lego seem flimsy and insubstantial to me. Besides, 99% of the holes you will be drilling will be perpendicular to the surface you are drilling, so having the ability to drill lots of different angles isn't very useful. <br>If you do encounter a situation where you need to drill an angled hole, it usually isn't a nice neat angle like 30 or 45, you'll probably just have to eyeball it, so this probably wouldn't save you any time, unfortunately.</p>
<p>This is just for a quick and accurate ball-park drill guide, not a professional permanent item. You can also quickly adjust the angles rather than having a bunch of permanent angle guides taking up space. And, you can build a rocket ship with it too!! :)</p>
<p>it would be, except you cannot see the exact spot to drill through a 2x4. The blocks provide a clear view of the placement of the hole as well as maintain the angle</p>
little bit of super glue and it would be as strong as any 2x4 ?
<p>Simplicity can drive to, high complexity. Really clever instr.</p>
<p>Cool idea.</p>

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