Build a pair of sawhorses you're allowed to cut into

Quick answer: Five eight-foot 2x4s, a scrap of 3/4-inch plywood, 2-1/2-inch and 3-inch construction screws, and wood glue. One afternoon. You get two sawhorses about 30 inches tall with a top board you can cut straight through and replace whenever it's chewed up.

Most first-timers build sawhorses too nice. They sand them and finish them. Some even put a coat of poly on. Then the first time a circular saw blade dips a quarter inch into the top, they wince like they just backed into a mailbox.

Don't build furniture. Build a tool that's meant to get hurt. Every sawhorse ends up cut, drilled, glued on and stood on. The smart design accepts that from day one with a sacrificial cap, a plain 2x4 screwed flat on top that you swap out when it looks like a beaver got to it. Everything underneath stays clean for years.

That's the angle. The rest is just good carpentry, and this project teaches almost all of it.

The design in one paragraph

Each horse has a spine, a 36-inch 2x4 standing on edge. Four legs splay out from its faces at 15 degrees, two on each side, forming an A at each end. A plywood gusset ties each A together. The cap sits flat on top of the spine and the leg tops. There are no compound angles and no joinery you need a video for. Screws and glue do the work.

Cut list for the pair

• Spines: 2 at 36 inches
• Caps: 2 at 36 inches
• Legs: 8 at 30 inches, both ends cut at 15 degrees, parallel
• Gussets: 4 from 3/4-inch plywood scrap, traced in place (more on that below)

Three 2x4s give you nine legs, so you have one spare. Two more give you the spines and caps with a short offcut each. Buy six, not five. One board in every stack at the store is shaped like a hockey stick, and you won't notice which one until you're home. Sight down each board before it goes on the cart and leave the twisted ones for somebody in a bigger hurry.

Tools: a miter saw or a circular saw with a speed square, a drill and driver, a tape, a sharp pencil, two clamps, and glue. If you're still putting that kit together, start with these five tools and a tote to carry them.

Eight legs that match

The legs don't have to be 30 inches. They have to be the same. A horse with legs at 29-7/8 inches all around sits flat. A horse with three at 30 and one at 30-1/8 rocks forever.

So don't measure eight times. Measure once, cut the first leg, then clamp a stop block to your saw's fence or support so every leg after it butts against the same spot. Eight identical cuts, zero tape-measure arithmetic. If you want the full method for marking that first cut, measure and mark so the cut is right the first time.

Now the part that trips up nearly everyone.

With the leg lying flat on the saw, the 15-degree cut is a bevel, with the blade tilted. It isn't a miter, where the saw swings left or right. The splay runs across the 1-1/2-inch thickness of the board, not the 3-1/2-inch width. Cut a miter by mistake and your legs splay along the length of the spine instead of out to the sides. You'll find out at assembly, with eight wrong legs on the floor.

Second trap: both ends get cut parallel. Looked at from the edge, the finished leg is a long, skinny parallelogram, not a trapezoid. The top cut sits flat under the cap and the bottom cut sits flat on the floor. Cut one leg, hold it against the spine at roughly the right angle, and check before you cut seven more.

On a circular saw, set the shoe to 15 degrees and run it against a speed square held tight to the board. Go slow. The bevel wants to wander.

Assemble the A-frames

Lay the spine on its side. Mark a line 2 inches in from each end. The outer edge of each leg lines up on that mark.

Put glue on the top 3-1/2 inches of the leg and set it against the spine face, angled out, with the beveled top flush with the top edge of the spine. Run your thumb across the joint. You shouldn't feel a lip. Clamp it, then drive two 2-1/2-inch screws through the leg into the spine.

Flip the spine and do the matching leg on the other face. And here's the annoying part nobody mentions: the spine is only 1-1/2 inches thick, so the screws from this side are aimed straight at the screws you just drove. Stagger them. If the first side went high and low, put the second side in the middle. Otherwise the second screw finds the first, stops dead, and strips the head while you lean on the drill.

If you want these to outlive you, upgrade to one 3/8-inch carriage bolt at each end, through leg, spine and leg, with a washer and nut. It's a stronger joint than screws alone. It's also optional.

Trace the gussets, don't calculate them

Stand the horse upside down on its spine. Lay your plywood scrap across the outer edges of one leg pair, tight up against the underside of the spine. Trace along the outside of both legs from underneath. Mark a bottom line about 10 inches down. Cut along the lines and you have a trapezoid that fits exactly, without a protractor in sight.

Glue it to the leg edges and to the spine where it touches. Drive three 1-1/4-inch screws into each leg. Do all four ends.

This is the piece that turns four wobbly sticks into a frame. Before it goes on, you can rack the A with one hand. After, you can't.

The cap that takes the abuse

Set the 36-inch cap flat on top. Square the ends to the spine. Now drive two 3-inch screws at each end, within 3 inches of the end, and nowhere else. Countersink them so the heads sit well below the surface.

No glue. No screws in the middle. The middle is where blades go, and a saw tooth meeting a steel screw is loud and expensive. It's sometimes dangerous, too. Keep metal out of the cutting zone and you can rip a sheet of plywood laid across both horses and let the blade kiss the caps without thinking twice.

When a cap gets ugly, back out four screws and put a new 2x4 on. Five minutes.

Wobble, height, and the honest trade-offs

Set both horses on the floor where you'll actually use them. Garage concrete is rarely flat, so a horse that rocks on one spot might sit dead still a foot to the left. If one truly rocks everywhere, find the long leg and take a little off its foot with a sanding block. Shave less than you think you need, then check again.

Thirty inches works for most people doing most things. If you're tall, cut the legs at 32. And if most of your work is crosscutting with a handsaw, these are the wrong height. You want your knee on the board, which means something closer to knee height. That's a different build, and a sawbench is the better first project if that's your work.

These horses are also heavy and they don't fold. If you're working out of a shared one-car garage, folding metal horses store better. But they don't let you screw a jig to the top or saw through them, and you'll miss that within a month.

What the second one teaches you

Build them one at a time, not side by side. The first horse is where you learn the bevel, the stagger and the gusset trace. The second goes together in half the time. It'll also be a little better, and you'll be able to tell which is which forever. That's fine. Write the date on the inside of a gusset.

If there's a kid in the house, the second horse is the one to hand over. They can drive the gusset screws while you hold it. It's a real job, and it's the right size for a first one.

And if the miter saw was borrowed from your father-in-law, it goes back with the sawdust vacuumed off the table and the fence wiped down. Bring a box of the screws you didn't use. That's how you get to borrow it again.

Then lay a board across your new pair and cut something. Right through, into the caps. That's what they're for.