The number of logs grappled for each cycle is dependent on size and often by product.
Loading elemental time functions were grouped into: (1) Swing to log pile--Begins when the grapple swings to log pile and ends when the grapple reaches the pile and is ready for grappling; (2) Grapple--Begins when grapple starts to gather a load and ends when the grapple is full; (3) Swing to truck--Begins when grapple starts to swing to tractor-trailer with a full grapple of logs and ends when grapple reaches the tractor-trailer; (4) Ungrapple--Begins when loader operator opens grapple and drops logs onto the truck and ends when loader is ready for another load; and (5) Rework--Consists of time taken to rearrange some of the logs grappled in a turn for better placement and a safe and full load.
th] average small-end diameter of logs grappled per turn; A[L.
The loader grappled two logs per turn with an average volume of 54.
The average log length grappled per turn was the only factor that affected swing to pile time significantly (F = 4.
It changed slightly and was not significantly affected by small-end diameter class of logs grappled per turn, average length of logs per turn, the number of logs per turn, or product types (Table 5).
It differed significantly among the average lengths of logs grappled per turn (F = 1.
There was no significant difference in ungrappling time among average small-end diameter class, the number of logs grappled per turn, and among product types (Table 5).
55 minutes and was significantly different among average small-end diameter of logs grappled per turn (F = 3.
The productivity generally increased with increasing average small-end diameter class of logs, average length of logs per turn, and the number of logs grappled per turn (Table 5).
Loading unit costs also generally decreased with an increase of the average small-end diameter of logs grappled per turn (Fig.