Useful Tips

Folding Plywood Joinery


Joinery is indispensable in the workshop and in the construction of your own home. You can buy them in construction stores, but they are quite expensive, bulky, heavy and inconvenient to transport.

In order not to spend a lot of money and time, this device can be made of plywood. This design will be lightweight, and due to the lack of complex connections and a folding mechanism it will not take up much space and will make it easy to transport it in a car.

Color Detail Explanations

  • Green: top tops 844 * 90 mm - (need 2 pcs.),
  • Yellow: lower support cross member 711 x 90 mm (originally assumed 711 x 180 mm),
  • Orange: upper jumpers 844 x 90 mm (originally assumed 844 x 180 mm),
  • Blue: legs. 844 * 90 mm - 8 pieces,
  • Pink: parts for making wall mounts,
  • White: waste.
We cut the workpieces on a sawing machine, a circular saw or other devices.

Sidewall assembly

To begin with, a piece of plywood 80 x 200 mm was cut; it acts as a marking template in the manufacture of joint parts.

At this stage, the task is to connect the support legs to the upper and lower crossbars.
When mounting the upper cross-member, it is recommended to attach hinges so that in the future self-tapping screws for hinges do not fall on self-tapping screws for fastening blanks from plywood.

We drill the fastening points with screws with a drill of a smaller diameter, countersink holes to hide the caps of the screws in the future.
To join the parts, we also used PVA carpentry glue, a small amount of glue was applied to the joint, a blank was applied and tightened with self-tapping screws.

Sidewall connection

After the sidewalls have been made, you can fasten them with furniture hinges. thereby making the folding and unfolding mechanism.

Then we fasten the upper supporting platform to the end of one of the sidewalls.
It is not necessary to both, otherwise the mechanism of opening and closing will not work.

Opening limiter manufacturing

For safety when working on goats, when they open more than 20 degrees, a disclosure limiter was invented.
It is made of polypropylene rope, as This material is inelastic, durable and inexpensive.
To make the limiter, we drill holes in each leg in the region of the lower support, and we pass the polypropylene rope into one then into the second leg. Tighten the knot on the rope, and melt it using a conventional lighter.

Goat Check

To dispel doubts about the strength of this design, tests were carried out, for this they stood on a trestle of three and jumped very well.

We were convinced of the reliability of the design and dispelled doubts.

Production of mounts for goats on the wall

Also, for convenient storage of paired goats, simple wall mounts were invented.

for this, plywood was cut out of plywood

  • 2 workpieces 206 x 50 mm,
  • 2 blanks 188 x 50,
  • 2 triangles with legs 188 mm each.

The overall dimensions of the workpieces are also given above on the plan for cutting parts.

To tighten the blanks, black 50 mm long wood screws were used.

After manufacturing, mounts can be hung on the wall.

And the goats themselves are on them so that they do not interfere when they are free from work.

Design and use cases

Unlike classic trestles, the universal goats are folding, which facilitates storage and transportation. The design of the joinery construction has the form:

  • legs with struts pivotally interconnected
  • removable support bar
  • belt tie down

The device allows you to harvest firewood, cut lengthy lumber and put the scaffold shields (you need 2 pairs of trestles) by default. On a supporting crossbeam, a wooden tabletop can be fixed to accommodate a power tool (for example, trimming, drilling, grinding machine).

If you assemble a light frame from boards or plywood, you can build a large joinery workbench from two trestles for assembling furniture.

The cutouts in the support strip allow you to work with tubular blanks, to press the lamellas of glued joinery parts. On one side of the tragus, you can fix a sheet of plywood, gypsum board, OSB for marking, straight or curly cut.

In-house manufacturing budget

The following dimensions are valid for trestles 0.8 m high:

  • legs (4 pcs.) - 0.95 m
  • upper crossbar - 0.9 m
  • spacers (3 pcs.) - 0.85 m, 0.77 m and 0.7 m

Therefore, for the manufacture of two sets of fixtures, lumber and fasteners will be required in the amount of:

  • board 95 x 45 mm - 5 pieces each 2 m
  • board 90 x 20 mm - 1 piece 2 m
  • board 90 x20 - 1 piece 3 m
  • furniture bolt M10 x 100 with nut - 4 pieces
  • M10 washers - 12 pieces
  • self-tapping screws 4 x 45 - 50 pieces (for wood)
  • belt - 2 pieces

Attention: The main problem when buying boards is the choice of dry wood with a stable geometry. There is no rigid frame in the tragus, so “propellers”, boards with a difference in thickness, and a flash are not suitable.

An approximate estimate of the manufacture of universal folding goats is as follows:

  • belt - 140 rubles. (2 pieces per pack)
  • bolts included - 75 rub.
  • self-tapping screws - 30 rubles.
  • board - 1000 rubles.

You can meet the amount of 1.25 thousand rubles, that is, at least four times cheaper than when buying ready-made trestles.

Cut blanks

All parts for one side of the legs are marked separately:

  • 2 m of board gives two elements
  • protractor marking starts from the edge
  • on the side of the 45 mm line at 65 degrees
  • its continuation at the end (“inch” board) line at 80 degrees
  • cutting is carried out with a hacksaw with a small tooth, since the cut occurs simultaneously in two planes

The second cut is parallel to the previous one, made at a distance of 0.95 m from it. The second leg is easier to mark, saw off according to the template, which becomes the first part.

The cutting line of the upper support is straight (90 degrees), there are no problems. All struts are cut from two sides at an angle of 80 degrees with narrowing up. The length of the blanks is different - 0.85 m, 0.77 m and 0.7 m. The cut is made in one plane, it does not need to be cut at the end. The result is a set of parts for one tragus.

The most difficult operation of the cut is the manufacture of cuts, in which the removable upper support bar will fit. Seats are marked in the following way:

  • the legs are located on a flat area in the form laid out for use (lower supporting surfaces in one line, can be supported with a long board)
  • the cut is marked with a square set 5 mm from the edge of the upper bevel of the leg, with a ruler located at a right angle to it at a distance of 8 cm

Attention: In this case, 8 cm is the depth to which the support bar fits into the groove, at the indicated dimensions it will be 15 cm above the legs, and not flush with them, which will prevent damage by accidental contact with the cutting tool.

The result should be the groove shown in the figure:

It is better to process parts before assembly, after drilling holes, it is enough to apply paintwork on newly created surfaces to ensure the maximum resource of the device. It is inconvenient to paint the legs after assembly, since access to certain sections of the boards in contact with each other is limited. In addition to paint and varnish, stains, waxes, oil formulations can be used. Before this, all surfaces must be sanded.

Materials and tools for work

  • decked 18-21 mm plywood,
  • hinges from doors
  • screws
  • polypropylene rope
  • circular saw.

goats must be chosen for convenience and depending on the height of the master who will use them. Usually on average it is 80 cm, a width of about a meter, the width of the legs is 10 cm.

Leg assembly and fitting

The performance of the device depends on the quality of the marking of the bolt hole. Therefore, a preliminary fitting is required for the technology:

  • the leg is laid on the table so that the cut-out hangs over the countertop (you can use a stool, a chair)
  • support plate (upper) is installed vertically in the groove
  • a second leg is added on top of the first (the bar should fit snugly on the cutouts in both parts)
  • the structure is temporarily pulled together by a clamp

Then the operations are performed:

  • a vertically placed square, the intersection of the legs is transferred to the side surface on both sides of the structure
  • the resulting points are connected by a line that becomes the vertical axis of rotation
  • the longitudinal axis of the leg is marked with a square
  • at the intersection of these lines, there will be a center for the hole of the M10 bolt, which is the joint hinge

Caution: The holes must be perpendicular to the plane of the boards, therefore a conductor is required. They can serve as a cut in a bar, pressed to the leg with a self-tapping screw or a clamp. If the hole is inclined, the legs will not be able to transform into the working position.

Leg assembly is carried out in stages:

  • the bolt goes through one part
  • two washers are put on it, facilitating the rotation of the wooden elements relative to each other
  • the second leg is put on the threaded part
  • swivel fixation with nut

The result is a set of two legs, into the cuts of which the support bar is easily inserted from above.

Spacer mount

The design does not have the necessary spatial rigidity, it falls off from insignificant lateral loads. Therefore, it is necessary to strengthen the tragus with struts:

  • legs are folded along, laid on the floor in parallel
  • 15 cm from the bottom on the exterior
  • the longest spacer is applied (95 cm)
  • holes are drilled for self-tapping screws, eliminating the splitting of wood when tightening
  • one hardware is fastened on each side to provide some mobility
  • the structure is turned over, marks are created at exactly the same height of 15 cm, only already on the internal details
  • a 77 cm spacer is fastened similarly to the previous one with one self-tapping screw on each side

Then the last upper strut is attached:

  • universal goats unfold in operational position
  • a support bar is installed in the cuts
  • distances from the grooves are laid down 20 cm
  • the spacer is set on top of these marks
  • profiting by self-tapping screws similarly to the previous details

If necessary, adjustment is made, if all the parts are located without backlashes relative to each other, the second self-tapping screws on all struts are screwed in.

Lower tightening belt

The support bar does not allow the legs to fold inward. However, the home master can displace them out by chance, the structure will “corrode” and lose stiffness. To do this, use a belt coupler, fixing the opposite lower struts. It is installed by technology:

  • trays are laid out
  • the middle of the lower strut is marked
  • a through hole is drilled with a 10 mm drill (for M10 bolt)
  • 40 cm from the belt carabiner, a hole is punched into which a bolt is inserted

After that, it is enough to fasten the bolt with the belt in one strut with the nut, tighten the belt around the opposite support, cut off the extra length. With the same belt, a support bar is attached to the legs during transportation or storage when folded.

Thus, the universal folding tragus is made on its own with a minimum set of tools for a couple of hours. All parts are pre-made templates, which facilitates the further assembly of the required number of these transformable devices.

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