Activity Classes
The different activity classes in AVIX that are used to define standard times are based on complete movements, e.g. ”Back and forth”.
The activity class (standard time) is based on the length and difficulty of the movement. These two factors are a natural way of defining how long time it takes to perform a certain movement.
A “difficulty” occurs when the movement (the time of the movement) is increased due to a problem or obstacle. The movement stops and its natural pattern is broken when:
- Gripping/re-positioning, it can be difficult to grip a part or parts e.g. an exact number of screws in a box.
- Affixing/fitting, it can be difficult e.g. to fit a pin in a hole.
If the movement includes a difficulty, the activity class will be doubled (A=BB, B=CC, C=DD)
If the handling is concluded to be more time demanding than a doubled value, the handling has to be split into separate movements.
One movement for handling and another for the difficulty, e.g. first fitting then adjusting.
| Activity class | Length of movement | Difficulty of movement | Standard time sec. |
|---|---|---|---|
| A | Long movement, >13 cm, max 1 arm length | With difficulty | 2.23 |
| B | Long movement, >13 cm, max 1 arm length | Without difficulty | 1.11 |
| B | Short movement, max 13 cm | With difficulty | 1.11 |
| C | Short movement, <13 cm | Never difficult | 0.56 |
| D | Eye movement | Eye movement | 0.28 |
| Activity class | Example |
|---|---|
| A | Picking exactly 3 screws from a box, or picking up a coin from a table. |
| B | Picking a tool or placing something somewhere (not exact). |
| C | Turning a knob or pushing a button nearby. |
| D | Checking a component, or reading a short serial number. |