You will need
- Wooden blocks, wood saw, chisel, chisel, hammer, screwdriver, screws, nails, wood glue
The simplest design involves two ladder stands and a number of rungs that serve as steps. The length of the uprights should be selected based on the desired height of the ladder and its intended use. There are stairs in length from one to eight meters. The stair width should be about half a meter.
For the manufacture of stands take high-quality wood. Make sure that the bars had no irregularities, knots, dents from knocks. It is important to ensure the reliability of future steps. The preferred cross-section of the bars is rectangular, with a size of 50 to 100 mm.
Steps recommended to perform from bars of square or rectangular cross-section with dimensions of about 50 mm. the Criteria for the choice of wood for steps of the same – you need a dense wood without knots. To choose short sticks for the beams is much easier than the billet racks. Selected for the manufacture of the ladder bars should be dry, raw wood is not good. Another important requirement for the blanks – they should not contain the medullary part of the trunk of the tree.
Desk and stairs can be fastened in several ways. In any case, the distance between the rungs can be in the range of 30 to 50 cm is the Main criteria – ease of movement on the stairs.
The easiest way mounting rails suitable for temporary ladders, designed for occasional work at height. In places of fastening of the crossbar slightly nasverliv to prevent splitting of the wood. Then attach them to the posts with nails or screws. The disadvantage of this simple fastening – low reliability because of the weight the lintel carries the load on separation from the rack.
Another way is deprived of the described shortcoming. Rack make cuts across the width of the stairs so that they're slightly recessed in the rack. Step attach the two screws perpendicular to the rack. Because several incisions weaken the rack, it needs to be wider and thick in cross section. The described method is more reliable, but is not suitable for long ladders.
More preferred for critical structures will be the third mounting method. In the rack with the help of a drill, chisel or the cutter apertures. In these holes insert the crossbar with a thickness of about 40 mm. it is Possible to strengthen the connection, placing a level in the nest on the glue. Rails are fastened with screws with end parts for reliability are inserted wedges. This method of device stages requires carpentry skills and time. However, the reliability of the design, these costs will pay off.