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How to Make a Miter-Saw Measuring Block

Making repetitive miter cuts isn't always easy. Use these step-by-step instructions and learn how this special jig can help make accurate miter cuts.

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making a miter saw measuring block
  • Time

    30 Minutes

  • Price Range

    $1 - $50

  • Difficulty

    Easy to Moderate


Step 1: Cut Molding and Attach Poplar Pieces

Measure and cut a 12" (outside length) piece of 1-1/2" molding. Set aside. With wood glue, attach two pieces of 3/4" poplar, each measuring 4" x 12". Allow glue to dry.

cut molding and attach poplar pieces

Step 2: Cut the Poplar

Using a band saw, cut one end of the poplar narrower than the other so it will accept a C-clamp when clamped to the fence. Using a miter saw, cut a 45-degree angle from the opposite end of the poplar.

Step 3: Mark the Block

Starting 1" from the narrow end of the block, make a series of marks 1" apart. Mark a zero by the first mark -- the one farthest to the left.

mark the block

Step 4: Place the Guide along the Fence

Place the guide along the fence and set the miter saw. Using the 12" piece of molding, place the right-hand miter against the saw blade, and slide the guide into the left side.

place guide along fence

Step 5: Affix the Ruler to the Fence

Affix the ruler to the fence, aligning the 12" mark of the ruler with the zero mark on the measuring block. (Note: Because most rulers run left to right, mount the ruler upside down so the numbers run up from the blade.) When measuring conventionally on a miter saw, the 12" mark of the ruler will be aligned with the left-hand miter of the piece of molding. In this case, because a measuring block is being used, the 12" mark will align with the zero on the block.

Step 6: Label Marks

Label the other marks as follows: At the measuring-block mark that aligns with the 11" mark on the ruler, mark 1/2. At the 10" mark on the ruler, mark 1 on the block. At the 9" mark on the ruler, mark 1-1/2 on the block and so on. (This indicates that the 1-1/2" piece of molding has a 9" inside miter measurement.)