Definition(s) of QUALITYIs the produced OUTPUT meeting its specifications - Where did we lost PRODUCT?
A machine should only produce product that fully meet its specifications.
When the output does not meet the spec:
When and What reject did occur?
Quality in OEE means: meeting the Specifications
The definition of Quality within OEE is a simple one:
Producing a product that meets ALL specifications,
not by trying more than once but First Time Right.
'Specifications' determine 'Quality'
Check your specifications at least for the following characteristics:
Specifications with a fixed value (no specification-range) have zero tolerance against that value. So [0=0] and [55=55.00000].
Specifications within a range allow a natural variance (or standard deviation) within those limits (>= 1,25 and <= 1,5). Check the correctness, meaningfulness and feasibility of the range as it if often not correct.
Combined standard deviations
The rule is:
All standard deviations brought together in ANY combination
will still produce a correct end-result.
Make sure your quality-specifications meet this rule to prevent sub-optimal settings.
In terms of OEE, Scrap, Rework and Sub-spec are the same:
It was ‘not first time right’;
therefore it is a loss
- Without applying strict criteria, process control can not be achieved.
Who can afford to have (quality)losses,
can certainly afford to eliminate them
Quality is (far) more than a set of papers...
- Defining scrap-product definitions may reveal poor specifications or poorly testable specifications!
- Good specifications always refer to the needs of the customer!
- We can only ask the operator to produce quality when he is able to check the quality of his labor!
- Who performs a task guarantees its quality
- Who guarantees, is allowed to set requirements
- Who cannot guarantee the quality of its output is obligated to stop the process
- Who detects a downstream failure, returns it to the previous step without correction
- Who makes a mistake solves it
- It is allowed to make a mistake ónce, in order to prevent it from ever re-occurring
- The management guarantees a system that allows the employees to perform its task within its specifications
The standard is the theoretical maximum speed for a product(group) on the machine;
thus the performance rate never exceeds 100%
100% OEE =
The theoretical maximum capacity of the equipment
And thus it can NEVER be more, so:
At well-chosen Standards, the performance rate will NEVER exceed 100%,
unless the product or the machine fundamentally changes
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