§ 17
How many cubic metres are there in 20 logs of 5 m with 32 cm average diameter?
Answer: Sawn timber is cubed according to length and mid-diameter without bark: the trunk is calculated as a cylinder with the diameter measured in the middle of the log. If you measure with bark, subtract twice the bark thickness. The calculator gives the volume per log and for a whole load or stack with identical logs, so you can verify a billing or assess a lorryload.
Midtdiameter uden bark = målt midtdiameter − dobbelt barktykkelse
Rumfang pr. stok (Huber) = π/4 × (diameter i m)² × længde i m
Rumfang i alt = rumfang pr. stok × antal stokke
The diameter is squared: 2 cm too much on a 30 cm log gives approx. 14% too much volume
| Symbol | Meaning | Unit |
|---|---|---|
| midtdiameter | Measured mid-diameter | cm |
| barkfradrag | Double bark thickness (0 if measured without bark) | cm |
| laengde | Stick length | m |
| antal | Number of identical logs | stk |
| = | Total volume | m³ |
| = | Volume per piece | m³ |
| = | Mid-diameter without bark | cm |
| = | Sticks per cubic metre | stk/m³ |
Does not apply when
The calculator's own default values inserted. The figures are calculated with exactly the formula the tool uses.
Substituted
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Når tømmer er afkortet og stablet ved vejen, kuberes det efter længde og midtdiameter uden bark. Du bruger det til at kontrollere en afregning, vurdere et læs eller planlægge transport.
Du har 20 rødgranstokke på 5 m med 32 cm midtdiameter målt med bark. Barken er ca. 1 cm tyk, altså 2 cm i alt.
It means: Stokkene har i alt 7.07 m³. Hver stok er 0.353 m³ med en midtdiameter uden bark på 30 cm.
Fire bøgekævler på 6 m har 52 cm midtdiameter målt med bark. Bøgebark er tynd, så du trækker 1 cm fra.
It means: De fire kævler har 4.9 m³, altså 1.226 m³ pr. kævle.
60 afbarkede rødgranstokke på 4 m har 22 cm midtdiameter.
It means: Stakken er 9.12 m³. Stokke pr. m³: 6.6 stk/m³.
En stok på 5 m med 30 cm midtdiameter er ca. 0,35 m³.
Gang rumfang pr. stok med antal. Det skal give rumfanget i alt.