How to Build a Saw Horse

One of the most useful tools a carpenter can have in a construction project is a good pair of saw horses (or sawbucks, as they are sometimes called). You can build your own set if you have a circular saw, tape measure, an angle square and a hammer and nails.

Steps

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2X6 nominal southern yellow pine was used for the horses in the illustrations, and was ripped down, or split to make the finished product lighter in weight, but 2X4 (no ripping) using lodgepole or white pine, or spruce will also work. For horses that are to be left outdoors in the weather, it may be worthwhile to buy lumber that is treated to resist rot and insects.
Since you are building the saw horses, it can be assumed you don't already have a set available, but if you do, of course use them.
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Rip the lumber in half if you are using 2X6 boards and they do not have big knots or have to support a great deal of weight. This will reduce the total weight and amount of lumber required by half (compared to 2x6). For using full sized 2X4s, skip this step.
For a typical 6 foot (1.8m) tall worker, 34-36 inches (.86-.91m) is about right, for shorter individuals, you may need to adjust the height. It is suggested you build your horses a bit tall, since the legs can be trimmed when they are complete to fit the user.
For a good spread on the horse's legs, an angle of about 65 degrees from the square line, or 25 degrees from the board's edge should work nicely; those angles do and should total 90 degrees. You will want to note, you are cutting this bevel square to the narrow edge of your board, so you may find you need to mark both top and bottom, and recut through from the bottom to get all the way through the board. These cuts need to be flat (and straight), so they will fit against the top board flush and tightly.
Make a mark an inch or so from each end, and draw a square line to determine where to attach the legs, on both sides.
Position your first leg on the square mark made previously, and nail it so the bevel is set tightly against the edge of the top board. Blunting the point of your nails will decrease the likelihood the wood will split when it is nailed, and using an 8d (8 penny) nail for this will give sufficient holding power without passing through both pieces.
Nail the other two legs opposite to the first pair. You can use larger nails now, since if the points project through, they will go into the back of the first pair of legs and increase the strength of this joint.
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Stand your partially assembled horses upright, and measure down from the bottom of your top board about 8 inches (20cm), and using a short board, scribe it to be a horizontal spreader brace to fit between the legs. The angles on these braces should be roughly degrees 115 top and 65 bottom for total of 180 degrees, but scribing all of the braces in position will provide a better (more exact) fit. Use your scribed brace as a pattern to mark three additional pieces, making sure you have two for each Sawhorse.
- The 65 degree angle is called "25 from square" because you can find a 65 angle by marking "25 off from 90" using a tool called a 90 degree "rafter angle square," or "speed square" or similar instrument.
~ Nail the braces on each pair of legs carefully, making sure they position the legs so the horse stands flat and straight on level ground.~ Nailing these braces out of position will mean the horse will wobble and be unsteady.~ Holding the horse upright and straight while nailing is worth the effort.
Cut another board about 18 inches (46cm) long, with a 45 degree angle on one end as the diagonal brace. Hold the angled end against the spreader brace and scribe the other end where it intersects the top board, then cut this mark. Use this piece for your pattern and for a pair of horses, cut 3 more.
Nail these braces in place, with the end cut on a 45 degree angle butted into the spreader brace and nailed through from the brace into the end grain, and the scribed end to the underside of the top board. This will be nailed across the grain into the bottom of the top board, so use nails that are large enough to get a good bite, at least 12d, and blunt the ends to prevent the wood from splitting.
If not, you can trim the legs that are long, making sure the top board is parallel to the ground.

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Question
What do I do if my saw blade is spinning in the wrong direction?
Community Answer
You can tell if it's spinning in the wrong direction if it's difficult to cut, there's lots of smoke, or fire. To fix, switch off and disconnect the saw, use a vendor's wrench to remove blade nut, remove and flip over the blade, then tighten the blade nut.
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Question
How do I get the angles?
Community Answer
If you're copying an existing saw-horse, use a sliding bevel tool, and a protractor -- from a table saw -- to capture and measure the angles. Or, if you use graph paper, you can quickly design your own, and measure the angles with an ordinary, draft-person's protractor.
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How do I get the correct angle?
Community Answer
Whatever the breadth of your timber, measure down 2.1 times this distance. For instance, if your nominal 2x4 is in fact 48mmx95mm, measure down 48mmx2.1 = 101mm, then draw your angle to the opposite corner. This is approximately 25 degrees (x 2.1445 to be precisely accurate).
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Tips

When sawing wood on your horses, setting your saw to the correct depth will make them last much longer.
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Putting an additional 2x4 flat on top of the horse will give you a 'sacrificial' piece of wood, that you can replace when it gets chewed up by your saw.
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The "A" shaped sawbucks for straight handsaws are usually only 20-24" high, allowing the user to kneel on the boards being cut. Adjust the height according to what feels right to you, keeping in mind the length of your saw.
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Warnings

Eye protection is recommended when sawing lumber and driving nails.
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Things You'll Need

A circular saw, tape measure, angle square (or speed-square), hammer, and nails.
Lumber of your preference. The horses in the illustrations required 2–10 foot (0.61–3.0 m) 2X6 boards, which were ripped to 2 3/4 inches wide, yielding 40 feet (12.2 m) of lumber.
- About 5- 8 foot (2.4 m) 2x4 boards would work (or 10- 42 to 48 inch boards will work).