Calculation of ferrules spiral
Spiral Calculation
In most cases, the calculation of the fechral coil is made for making a kiln for firing at home. In such cases, it is necessary to consider the resistivity of the alloy, the diameter of the wire, as well as the power of the power supply network. All data is given from the calculation of the known resistivity of fehral, equal to 1.4 Ohmxmm2/m at 220 V. Using the table, it is easy to determine the diameter of the rod, on which the coil is wound, and the length of the rod when winding "turn to turn", depending on the thickness of the wire. The length of the coil for a different voltage is recalculated using the usual mathematical proportion.
Legend: rod length - L, mm; rod diameter - D, mm.
| Ø of thread mm 0,2 | yarn diameter mm 0,3 | thread diameter mm 0, 4 | thread diameter mm 0,5 | ||||||
| D | L | Thread length | L | String length |
L | Strand length |
L | Strand length | |
| 1,5 | 40 | 942 | 60 | 942 | 80 | 942 | 100 | 942 | |
| 2 | 30 | 942 | 45 | 942 | 60 | 942 | 75 | 942 | |
| 3 | 20 | 942 | 30 | 942 | 40 | 942 | 50 | 942 | |
| 4 | 15 | 942 | 22 | 942 | 30 | 942 | 39 | 942 | |
| 5 | 12 | 942 | 18 | 942 | 24 | 942 | 30 | 942 | |
| 6 | 10 | 942 | 15 | 942 | 20 | 942 | 24 | 942 | |
| Thread Ø mm 0.6 | Thread Ø mm 0.7 | thread Ø mm 0,8 | thread Ø 0.9 mm | ||||||
| D | L | Yarn length |
L | Strand length |
L | Strand length |
L | Strand length | |
| 1,5 | 120 | 942 | 140 | 942 | 160 | 942 | 180 | 942 | |
| 2 | 90 | 942 | 105 | 942 | 120 | 942 | 1120 | 942 | |
| 3 | 60 | 942 | 70 | 942 | 80 | 942 | 90 | 942 | |
| 4 | 45 | 942 | 52 | 942 | 60 | 942 | 66 | 942 | |
| 5 | 36 | 942 | 42 | 942 | 48 | 942 | 48 | 942 | |
| 6 | 30 | 942 | 35 | 942 | 40 | 942 | 45 | 942 | |
The results stated in the table are easy to check according to the following formula. Length of thread (in mm) = nDL rod/thickness of thread, where n = 3.1415926, D - diameter of rod (in mm). If, for example, it is necessary to determine at voltage 127 V the length of rod with diameter 4 mm, for winding of wire with thickness 0.3 mm. The table shows that the length of the rod at 220 V equals 22 mm. Making the usual ratio: 22mm - 220V; X - 127V, we see: X = 22x127/ 220 = 12.7mm. Accordingly, the fechral wire will be shortened. When winding the wire, it is necessary to connect it, without cutting it, to the voltage source, making sure that it is winded correctly. Closed spirals increase the winding length by 1/3 of the value given in the table.
Supplier
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