Almost everything in our world has its own dimension. We measure oil in barrels, coal in tons, the population of countries in thousands, millions.
As a basis, we take a value that can specifically designate the object that we are measuring. When the question arises of how to calculate the cubic capacity of a board, we are no longer talking about the mass of the object, since wood has a completely different density, and one tree is different from another. In addition, boards of the same species will have different weights based on their moisture content.
For the convenience of calculating the cubic capacity of the board, volume measurement formulas are used.
Suffice it to recall school mathematics and the necessary formula by which the width, length and height should be multiplied. For the calculation to be correct, it is necessary to adjust all parameters to one value, for example, in centimeters or decimeters. It is most convenient to take meters as a basis. Thus, by multiplying three times in meters, we get m³ or cubic capacity.
Note. To calculate the cubic capacity of the board, special formulas are used.
Boards may have differences in width , length, thickness. In addition, they are sold unedged and edged. Often, lumber has its own generally accepted standards that facilitate the calculation of cubic capacity.
For usual sizes of material, there are already calculated volumes, which are systematized in tables for measuring the cubic capacity of boards. Therefore, to determine the volume of the material, you just need to open the table with the indicated dimensions and calculate the volume.
But, in order to do this, you must have these tables with you. Otherwise, in the absence of such, the cubic capacity of the edged board is calculated, before determining the thickness and length. These are the main dimensions that meet the requirements for sawn timber.
They are different for each individual material. For example, to create the lathing, a board is used, in which the thickness is 25 mm, and for rough floors, 50 mm. Next, you need to measure the width of the board.
In the case of edged boards, it is simple, because the material is cut to give the same width. Further, using a calculator, all values are multiplied among themselves.
With a board length of 5 m, a thickness of 50 mm and a width of 25 cm, the volume of the material will be:
5 x 0.050 x 0.25 = 0.0625 m³
After multiplication the resulting number by the number of boards, we get the total volume of material.
V = L x h x b
L - length
h - height
b - width
1 m 3 : V = N
In order to determine the cost of a particular type of board, with known volume values: V x price of 1 m 3 .
There is one more point that you need to pay attention to when determining the cubic capacity of the boards - the nominal length is exactly 6.1 - 6.2 m, but this is not taken into account when selling.This is often the case when buying a large amount of material. For example, let's take a board with dimensions of 150 x 20 mm.
Having made some simple calculations, we get the number of boards in 1 m 3 - 55, 5 pieces. So, in the cubic capacity of 6 m boards, there are exactly 55 pieces, in total, when calculating, we get the value 0.99 m 3 . Essentially, the overpayment for the cubic capacity of the board will be 1% of the exact price. For example, at a cost of 4,995 rubles, we pay 5,500 rubles.
Calculation of the volume of unedged board is somewhat complicated, since the material is not has the same width between different boards, but also in each board separately. This can be explained quite simply - the tree does not have the same diameter.
It's clear that at the bottom it is wider, at the top it is narrower. Thus, the width of the edged board does not fall under any standards. What to do in this case? Use different formulas for the calculation.
The width of the board is measured for convenience in the middle of the length. This gives you an average width. This counting method works well when the batch is small.
This method is not suitable, since the work will be very slow, and this is not profitable. For such cases, experts have developed the so-called unedged board cube.
The volume in it is obtained by measuring and experimenting, in other words, using many measurements and calculating the average value of the width.
Of course, this is not a super accurate method, but the deviations are so minor that they should not be paid attention to.
Some wood processing companies use the stack measurement method in practice. This does not require pre-sorting the wood by width. Experts measure the length of the board, the average width and height of the stack.
The obtained values are multiplied among themselves, and the result is multiplied by the coefficient for calculating the cubic capacity of the board, which has an average value of 0.67.
In order to measure the volume of unedged board, having received the most accurate result possible, use the weighing method.
Before doing this, it is necessary to measure the moisture content of the material and dense wood. Considering that edged board is the cheapest material used in facilities with the least degree of responsibility, complex calculations are not very justified.
Also, it should be taken into account that the result that you get will not be very different from the one that can be obtained using the cubature.
Here, professionals in their field are required to perform many tasks, including: calculation and budgeting before finishing the premises. In addition, you need to calculate the required amount of building materials. It should be noted that this task is quite difficult.Given this, determining the cubic capacity of the board is an important point.
Note. The cubic meter of lumber is calculated using a single method. The type of board does not affect the result obtained.
Non-grooved types of wood include: edged board, timber, unedged board.
Grooved types are those that have special grooves for perfect joining of boards: flooring, lining, blockhouse, imitation of a bar.
Please note that when purchasing a tongue-and-groove board, the calculation is carried out using the working width of the material, without spikes.
Regarding the calculation of the cubic capacity of an unedged board, with the width of one end of 25 cm, and 20 cm - of the other, the average value will turn out to be 22 cm.To calculate a large amount of material, it is laid out so that the wide part does not differ from a narrow one by more than 10 centimeters.
The main length of the board in the unfolded pack should be approximately the same. Then, using a tape measure, measure the height of the stack of boards and the width in the middle.
The result that is obtained from measurements is multiplied by a coefficient with a value of 0.07 - 0.09, which depends on the air gap between the boards.
( 2 marks, average 5 of 5 )
Posted By: Work Style |10, Nov 2020
Posted By: Work Style |12, Nov 2020
Posted By: Work Style |13, Nov 2020
Posted By: Work Style |09, Nov 2020
Posted By: Work Style |13, Nov 2020