Bench Elevation

In Depth and Slope mode, before you begin working, or whenever you move the machine to a new working position without GNSS in use, you must bench or re‑bench the machine.

Until you bench, no guidance information is available, and the Bench Elevation message displays.

To bench, use either of the methods described in the following table:

Bench method Description
Bench with a relative elevation

Place your attachment focus on any point.

This sets Cut/Fill to 0.00 at that position and you can enter an offset above or below the benched height to get guidance to.

Bench with a reference elevation (known elevation)

Place your attachment focus on a benchmark with a known elevation.

This sets Cut/Fill to 0.00 at that position and you can then enter a known elevation to get guidance to (instead of an offset away from the benched position).

NOTE – If you have a GNSS receiver or heading sensor, you need to bench the heading before you can bench the elevation.

Bench with a relative elevation

Using the Bench Elevation screen

TIP – You can use the bench elevation switch to bench the elevation.

You can access the Bench Elevation screen via the Work Settings menu or the shortcut bar.

Once you have positioned your machine, in the work screen:

Tap the Bench Elevation icon in the shortcut bar to bench the attachment focus directly. This sets Cut/Fill to 0.00 and you can enter an offset above or below the benched height to get guidance to.

Alternatively:

  1. Touch and hold the Bench Elevation icon in the shortcut bar to open the Bench Elevation screen.
  2. Select the Guidance Focus.
  3. Tap Bench.

Select a bench point

The bench point can be any arbitrary point, it does not even have to be a physical object.

If you use a physical object as the bench point, use something that is solid and will not move when you touch it with the attachment.

Position the machine

Place the machine so that it is within reach of the bench point and the surface to work.

1 Bench point 2 Surface to work

If using a section, orient the machine with the front linkage perpendicular to the mainfall of the section.

If using a slope, orient the machine with the front linkage parallel to the mainfall of the slope.

Position the attachment

Position the attachment focus on your bench point.

Bench with a reference elevation (known elevation)

Using the Bench Elevation screen

TIP – You can use the bench elevation switch to bench the elevation.

You can access the Bench Elevation screen via the Work Settings menu or the shortcut bar.

Once you have positioned your machine and attachment, in the work screen:

  1. Touch and hold the Bench Elevation icon in the shortcut bar to open the Bench Elevation screen.
  2. Select the Guidance Focus.
  3. Toggle Clear Offset on Bench off to keep your previous elevation offset after benching. The system remembers your selection for future use.
  4. Toggle the Reference Elevation on and enter the value.

  5. Tap Bench.

    This sets Cut/Fill to 0.00 at that position and you can then enter a known elevation to get guidance to.

To use the previous reference elevation value to re‑bench the attachment focus, tap the Bench Elevation Reference icon in the shortcut bar.

Select a benchmark

The benchmark is a known or absolute point in the system. Select a benchmark with a known elevation e.g. get a surveyor to measure the elevation of the benchmark.

If possible, the benchmark should be something solid that will not move when you touch it with the attachment.

Position the machine

Place the machine so that is within reach of the benchmark and the surface to work.

1 Benchmark 2 Surface to work    

If using a section, orient the machine with the front linkage perpendicular to the mainfall of the section.

If using a slope, orient the machine with the front linkage parallel to the mainfall of the slope.

Position the attachment

Position the attachment focus so that it is touching your benchmark.

If your benchmark is a survey peg or something that could move when touched, position the attachment on the ground, as close to the peg as possible.

Alternatively:

  1. Position the attachment focus above your benchmark.
  2. Measure the height from the benchmark to the attachment focus.
  3. Add the measured height to the height of the benchmark.
  4. Use this measurement as the Reference Elevation.

When to re‑bench your elevation

If you use GNSS in Depth and Slope mode you only need to bench once before you begin working.

If you do not use GNSS, you must re‑bench your elevation whenever you move the machine tracks; use either the original bench point, Touch Point, or a laser plane.

Placement of sections at the bench point

If you have created a section on the target mainfall or target cross slope, the system locates the placement point of the section at the benching point.

Useful text items

Text items display information on the work screen. When you bench the elevation the following text items can be helpful:

  • Cut/Fill <Center/Left/Right>
  • Distance from bench
  • Height from bench