AS ISO 7546:2021 Earth-moving machinery – – Loader and front loading excavator buckets一 Volumetric ratings.
5 Volumetric ratings
5.1 Basic bucket
The back sheet does not extend beyond a transverse line connecting the rear corners of the side sheets and the cutting edge does not extend beyond a transverse line connecting the front corners of the side sheets.
5.1.1 The strike plane passes through a line along the top of the back sheet at the rear and a line along the top of the cutting edge at the front as shown in figure 3.
5.1.2 The volumetric capacity is calculated as shown in figure 3.
5.2 Extended straight cutting edge
The cutting edge is straight in the transverse direction and extends beyond a transverse line connecting the front corners of the side sheets and the back sheet does not extend beyond a transverse line connecting the rear corners of the side sheets.
5.2.1 The strike plane passes through a line along the cutting edge at the front and a line along the top of the back sheet at the rear as shown in figure 4.
5.3 Extended back sheet
The back sheet extends beyond a transverse line connecting the rear corners of the side sheets and the cutting edge does not extend beyond the transverse line connecting the front corners of the side sheets.
5.3.1
The strike plane passes through the line along the top of the extended back sheet at the rear and a line along the cutting edge at the front as shown in figure 5.
5.4 Irregular cutting edge
The cutting edge extends beyond a transverse line connecting the front corners of the side sheets and is not straight in the transverse direction. The back sheet does not extend beyond the transverse line connecting the rear corners of the side sheets.
5.4.1 The strike plane passes through an imaginary transverse line at one third the distance of the protruding cutting edge at the front and a line along the top of the back sheet at the rear as shown in figure 6.AS ISO 7546 pdf download.