With its compact size, the workbench designed by Lucien LUFAU moves easily on its retractable wheels. Its metal structure and its deck are however robust enough to withstand heavy parts... or workshop machines used in a fixed position.
REALIZATION: approx. 2 weekends
COST: approx. 77 €
MINI EQUIPMENT: welding machine, grinder, drill, combination wood.
See the plan of this realization (in pdf): A mobile workbench: the plan
The solid beech wood deck is supported by a 35 x 35 mm square iron frame and a welded 30 x 30 mm square tube. Installed in facade, a press "ParisianIn the lower part, a shelf is used to store the tools Two wheels make it possible to move the workbench, the weight of which is considerable. retract by means of a lever and lock in position with a ring.
■ The price of this work is minimal (77 €), because it mainly uses recycled materials (reformed pallets, angles of an old bench and square screw with its nut taken from a dilapidated old workbench). For a little higher price, you can buy raw wood (oak, beech, ash...) in a sawmill or a trade and corrall them.
The metal base consists of four feet in square tubes of 30 x 30 mm section. They are joined by two frames, one in angles of 4 x 35 x 35 mm accommodates the deck, the other square tube supports a shelf. Most of the assemblies are made by autogenous welding, which requires a choice of an oxy-acetylene torch, an arc welding station or a station "MIGHowever, do not forget to protect your eyes with a welding mask or goggles depending on the system used.Aside from common hand tools, cutting parts is more convenient with an angle grinder. to rectify the weld seams.
■ The upper frame is welded to the top of the feet. The angles that constitute it are mitered at 45° at each end to be welded at right angles. The tubes of the lower frame are welded between the feet at 120 mm height. These four elements are therefore shorter than those of the upper frame. Bridle the feet before welding and check the perpendicularity. The end of the feet in contact with the ground is reinforced by a square skate cut in flat iron. An addition that increases the support surface at the same time. Six flat iron cleats of 5 x 30 x 60 mm are welded under the lower frame to support the shelf.
■ Mounted between the frame of the deck and the shelf spar, an intermediate amount of square tube reinforces the implementation of the press. Side opposite the press, the two feet are crossed, at 90 mm height and in the same alignment, by holes 10 mm in diameter. They serve as a passage to the axes of the frame supporting the retractable wheels.
The retractable frame
Two wheels with a 100 mm diameter rubber band are screwed under an iron angle of 3 x 25 x 25 mm section. It is positioned between the feet of the frame to weld on the spot two round iron pins 10 mm in diameter at its ends. Engaged in the holes of the feet, they are held during welding in the angle of the angle with tongs. The lifting effect is transmitted by a round iron lever 10 mm in diameter welded perpendicularly to one of the axes.
■ To effortlessly set the workbench on wheels, the chassis pivots with a 13/18 x 300 mm tube that is engaged on the lever. During the movements, the lever arm is held in the upper position by a sliding ring on a guide welded at mid-height of the nearest foot. A stud welded to the base of the latter, allows with the ring to store the lever arm at rest.
The retractable chassis raises the bench sufficiently to facilitate its movements. Its operating lever is held in high position by a sliding ring. Inserted in one of the holes of the right upright of the fixed jaw, a metal rod supports the end of the long pieces clamped in the press.
The worktop consists of several chevrons 60 mm thick assembled and recessed in the upper frame. This thickness of wood offers several advantages: a large mass, so good stability, perfect rigidity and excellent impact resistance. The rafters are glued flat together in their length and their assembly is reinforced perpendicularly by two threaded rods M10 through with nuts and washers.
■ To engage the rods, Ø 12 mm holes are drilled from edge to edge in the width of each rafter. In view of their final alignment, these holes require good precision and perfect perpendicularity with the songs. A drill mounted on a support is useful here. On the outer rafters, a countersink is dug to drown the nuts and washers.
■ An obviously square cut in the apron receives a claw abutment. Its machining is done by drilling several tangent holes before squaring them with the chisel. The stopper is made of a 55 x 55 mm cross section. Nails are nailed to the top of a face, their heads are then cut and beveled.
■ The apron fits into the upper frame and is fastened underneath with screws. In belt, 4 mm thick mattresses edge it to compensate for the thickness of the angle. Cut into a 30 mm thick chipboard, the storage shelf fits into the lower frame and screws onto the cleats. A cut is to be provided for the passage of the rear bearing of the press.
The pieces of hardwood constituting it are divided into two subassemblies. Solidary of the frame, the first incorporates the rear bearing, the two pieces of fur and the fixed jaw, the second, consisting of the single movable jaw, is articulated on an adjustable slide.
■ A crossbar supported by two studs assembled by tenons and mortises forms the fixed jaw. It is fixed to the frame by the right amount to the corresponding foot with stove bolts embedded in countersinks. The other amount of the fixed jaw is secured with longer bolts to the left foot, but also to the intermediate amount and the rear bearing press. The latter stiffens the fixed jaw on the frame and supports the square nut of the maneuvering screw. It aligns with the amount inside the base. An assembly that requires the cutting of a notch for the passage of the bottom rail of the frame. Two wooden furs fill the space between the fixed jaw, the press bearing, the foot and the intermediate amount of the frame. Regularly spaced on the right upright, holes Ø 10 mm accommodate a metal pin to support the long pieces clamped in the press.
■ The 50 x 110 mm section mobile jaw is chamfered at the top. After having drilled the hole Ø 32 mm, intended for the passage of the screw, it is adjusted on the fixed jaw with clamps. Using an auger, this drilling is extended in the left upright, the fur and the bearing AR. Once the mortise dug out dug in the fixed jaw, its outline is spotted on the fixed jaw. At the location thus defined is cut a blind mortise which articulates a flat iron of 15 x 40 mm of section on a pin of Ø 6 mm. This slide is pierced with a series of 6 mm holes spaced every 50 mm. A metal peg is optionally positioned in one or the other, to adjust the movable jaw according to the thickness of the workpiece.
■ The press screw comprises a screw and its operating lever, a front flange to fix on the front of the movable jaw, centered on the hole and a square nut on the thread, to be screwed to the rear of the bearing. Fasteners are provided by countersunk screws Ø 6 x 30 mm which engage in holes existing in these parts.
Milled in the rear bearing of the press, a notch allows the passage of the shelf cross. The nut of the screw is mounted on this same bearing. Breakthrough of several holes, the slide of the press is adjusted in thickness with a pin. The tight fit of the claw stop facilitates its height adjustment.
After removing the slag from the prick hammer welds, the cords are ground. All metal parts are degreased with trichlorethylene before being rustproofed, followed by two coats of finishing paint. The worktop and the lower wooden top are impregnated with linseed oil.
The tray is made from rafters recovered on reformed pallets. They are glued flat joint and their connections are reinforced perpendicularly by two threaded rods passing through from one side to the other.
To set up your work plan, drill a hole in the middle to house a bench valet and install a drawer below to store your tools.
■ To reliably find the support peg of the long pieces or the one that adjusts the thickness of the press, attach them to the workbench with small chains.