Use Two Squares for Dual-Axis Alignment

Set up two squares at 90 degrees to each other on the workpiece to provide visual alignment reference in both the left-right and front-back planes simultaneously.

How It Works

A single square only confirms alignment in one plane. By placing two squares perpendicular to each other (one checking left-right tilt, the other checking front-back tilt), you can visually confirm the drill is plumb in both axes before and during drilling. This is a significant improvement over the single-square method and approaches the accuracy of a physical guide.

Instructions

1. Mark and center-punch your drilling point
2. Place one combination square or speed square flat on the workpiece with its blade standing vertical, positioned about 1 inch to the side of the drilling mark
3. Place the second square perpendicular to the first, about 1 inch behind the drilling mark
4. Clamp both squares in position if possible, or have an assistant hold them
5. Position the drill bit on the center-punched mark
6. Looking from the front, align the drill bit parallel to the first square's blade
7. Looking from the side, align the drill bit parallel to the second square's blade
8. Start drilling at slow speed, checking alignment against both squares during the first few rotations
9. Once the bit is established in the material, the hole guides itself

Tips

• Combination squares with machined blades provide the most accurate reference edges
• Small magnetic squares can be stuck directly to the drill bit (if it is steel) as an alternative
• This method works well on both flat surfaces and edges of boards
• For repeated holes at the same angle, clamp the squares in place and use them as a fixed jig
• A torpedo level placed on top of the drill body provides additional confirmation

Common Mistakes

• Placing both squares in the same plane, which only checks alignment in one axis
• Not center-punching the hole location, which allows the bit to walk as you focus on alignment
• Moving the squares accidentally while positioning the drill
• Relying entirely on the squares without also using your natural sense of vertical — the squares confirm alignment, but your body position and line of sight are the primary guides