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Special Cases

There are some extra tricky cases to analyze, following are some examples and how to analyze them
Note the difference between assembling (value adding) and handling operations in AVIX:

  • ◼ Assemble: Only the movement of placing the part in its final location is counted, NOT affixing or screwing.
  • Place: When placing e.g. a part somewhere.
  • Affix: E.g. driving a screw.

Value adding machine work is defined as “work” and is e.g. grinding, milling, drilling etc. Note that only the machine time (when the machine works) is defined as ◼ green time. All tool changes, pre-run and adjustments of the machinery is semi-productive ( ◼ yellow time).

Note the conditions to get ◼ green color in the analysis:

  • The activity “assemble” or “work” must be chosen.
  • A value part must be chosen.
  • A time must be added e.g. A, B, C or clocked time.

Walking and at the same time assembling (e.g. a nut on a bolt).

Decide if you are going to analyze the assembly or the walking. Counting steps and adding A,B,C,D will be incorrect (double time). The time is based on either the steps or the assembly.

However, if it due to safety and quality reasons is not allowed to walk and assemble at the same time, both steps and assembly should be analyzed. This is because the time should reflect “first walking and then assembling”.

If an operator is walking up a stair without carrying anything, only the steps are counted. To walk onto a platform located higher than 20 cm, add 1 UOF to each step. If the operator is carrying a part heavier than 10 kg while walking stairs 1 UOF is also added.

If an operator is climbing a ladder, 1 UOF is added to each step.

To start moving a trolley with “normal” load, add 1 UOF and 2 steps. If the trolley should be parked in a specific location, add 1 UOF to stop the trolley.

It can be difficult to decide if the trolley has a “normal” load and the (inhibited) movement can be analyzed as “clocked movement”.

When a certain operation is performed blindly, the analysis is doubled. This means that an A⇾2A, B⇾2B=A, C⇾2C=B (⇾ means "becomes" ). If, however, the operation can be performed blindly without any difficulty e.g. tightening a nut already mounted on a bolt, there is no need to double the time.

If two operations are performed simultaneously, they are analyzed in separate/single operations. In cases where one of the movements doesn’t need concentration, that movement is “masked”, meaning that no time is added. This could be e.g. pressing two buttons at the same time.

Note that applying force always needs the operator's full attention and can never be masked.

When applying paste, grease or color by brushing or sweeping, use the following scheme:

  • When the distance is less than 20 cm = C
  • When the distance is less than 50 cm = B
  • When the distance is more than 50 cm = A

Movements above shoulder height require “1 stretching” per activity. This means that to add one more stretching the hands need to be below shoulder height and then raised above shoulder height again.

When a product is packed (placed in its final location) the action is classified as “assemble” ( ◼ green). The action of packaging can only be value adding one time. If the product or part is packed once more, the action is analyzed as “placing” ( ◼ yellow).

Use of force, UOF. The number of UOF added depends on how many times a movement requiring force is performed.

Clocked time is used when it is not possible to add standard times. E.g. Machine time or reading instructions. (Using the stopwatch)

Loss analysis
The loss analysis is separated from the activity analysis and is located below the analysis palette.

Steps, stretchings, bends and twists.
All steps, stretchings, bends and body twists are counted and registered.

Clocked movements are used when inhibited movements are performed. (Using the stopwatch)

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