Draw a simple diagram to plan out the dimensions of the table top you would like to make. Mark the table top's length and width measurements on the diagram.
Adjust your miter saw to cut at a 90 degree angle.
Cut your hardwood planks about 1 inch from ends with the miter saw. This will ensure that the final project has smooth, uniform sides.
Slip the metal hook of a measuring tape over the end of a plank. Pull the tape to measure the length you need and make a small mark there with a pencil. Extend the pencil mark across the width of the plank with a carpenter's square.
Line up the blade of the miter saw with the pencil mark and cut the plank. Repeat steps 4 and 5 for the remaining pieces.
Arrange your cut planks on a floor or table, placing them together width-wise. Apply wood glue to the long edges of the boards that you will glue together, then clamp the planks together with a large glue clamp.
Wipe away any excess wood glue with a cloth or paper towel and allow the glue holding the planks together to dry completely.
Remove the clamp and sand away any remaining excess wood glue. Stain or seal the wood if you wish.