Log volume tables

In CutLog refer to predefined formulas or lookup tables used to calculate the volume of a sawlog based on its diameter and length. These tables are essential for estimating how much raw timber (in cubic meters) a log contains before it's sawn.

In more detail:

CutLog supports three log volume calculation methods:

1. Common formula
   Volume is calculated using:
   V = π × r² × L
   where r is the log radius and L is the length in meters.
2. A. Nielsen formula
   A more advanced formula that includes species-specific coefficients A, B, and C to account for log shape variations.
3. JAS (Japanese Agricultural Standard)
   A standard method for logs typically used in Japanese markets, with volume depending on the small-end diameter and whether the log is shorter or longer than 6m.

You can configure and select these methods for each wood species under Settings > Log Volume in CutLog. This setup ensures accurate pricing, yield estimates, and pattern optimization based on the actual volume of logs used in productioncutlog_en.

In addition there is "Log volume tables" possibility, which overrides above formulas and takes into account only defined diameter and length and base on this values it has defined volume of sawlog. (optionally it can contains also taper of p;articular log size)

THIS FEATURE is available only in FlexiCut2 and CircularCut optimizations

Enable log volume tables feature

Define log volume tables feature

Sections

First, you have to either define custom log volume table, or import it from excel file. (some predefined tables you can find on CutLog's web page under support/volume tables menu here.

Here you can define as many volume tables as you need. Those are separate to various sections:

➡️GLOBAL - for all wood species defined within CutLog
➡️wood specific for particular wood species.

Below are several buttons and also hotkeys you can use within left panel:

[Rename log volume table] / [F2] - rename particular volume table

[Add log volume table] / [Insert] - insert new empty volume table under selected section. Name is generated as "xx Volume table", where 'xx' is next number in sequence of tables within section

[Copy log volume table] - duplicates log volume table within particular section

[Delete log volume table] / [Delete] - it is clear 👍

[Import from excel] - import log volume table from excel file. structure is predefined so please refer to some excel files from web page support/log volume tables

In addtion you can move any log volume table from one section to another just bny drag and drop feature:

Log volume table definition

So first possibility is to sort those data base on any column in grid. for example by length. You can do it just by click to column header: 

Next helpful functionality is  to group those data base on any column in grid. for example by length. You can do it just by dragging particular column to dedicated bar on top or drag it to back to ungroup by mentioned column.

 You can select multiple rows and by [Delete] button (or ctrl+delete) you can delete them:

 For deleting of particular length you can select whole group and delete it

 the same way you can delete diameters you don't need. Just group by diameter column and delete whole group

Taper definition

You can set taper value either by setting it directly within data grid

Or by selecting more rows and pressing [F2] key:

Or by selecting whole group and pressing [F2] key:

Optimimization functions

Now, after properly defining of log volume tables we can use them in optimization functions.

Let's look at FlexiCut2 optimization. 

Please remember, that in case, there is no log volume table defined either as Global or for particular wood species, then menu 'log volume tables is not visible.

In menu 'Log volume tables'  you can choose either 

'no volume table' if you want to use standard log volume calculation or particular log volume table:

After selecting particular log volume table youy can select combination within that definition.

Please remember priority of settings:

1. choose length of sawlog
2. select diameter
3. in case, that taper is 0 in volume table then you can also set it manually

so if you want to calculate dameter 400mm for length 3m, 

- first set length to 3m
-second set SED to 400mm
- in case, that taper is 0 in definition set it. 
Of course in volume tables has to be defined such combination:

 Imagine for simplicity definition in log volume table screen. Group by length and find diameter. it is the same logic: