Definition OEE definition - Overall Equipment Effectiveness - Definition of A (Availability)


Registered Visitor
I am going to post a side question here.
We are working with defining the OEE. A discussion that we hasent solved is the definition of the factor A (Availability).
We have a total time of 24 hours which is our theoretical production time, we have a planned preventive maintenance time for 3 hours and of course we have our unplanned stop time.
Depending on how we choose to define A we can get two factor A numbers
87.5% or 100% (if you calculate the unplanned stoptime to zero).
We are also going to implement SMED, and the first focus would be to look at the 3 hours of planned preventive maintenance.
Elsmar Forum Sponsor


Fully vaccinated are you?
My understanding is it would be 87.5% because the equipment is technically not available for production during preventive / predictive maintenance.

Below are the basics - I'll let the folks who use this a lot discuss your specific question of the definition of the A (Availability) factor.

OEE means overall equipment effectiveness. It is a method to find out overall effectiveness of equipment. It is obtained by multiplication of three ratios.

1. Availability ratio - Time for which equipment was available for operation divided by total calender period for which OEE is being calculated.
2. Quality Ratio - Quantity of "A" grade/Prime grade material produced divided by total production (Off grade+Prime grade)
3.Performance Ratio - Rate of production divided by Capacity of machine to produced.

Normaly OEE is presented in terms of percentage.

Elsmar Cove Wiki: Overall Equipment Effectiveness


Hi DavidB,

In order to achieve a calculation according definition of OEE you should define A as:

A = ((Calendar Time - (shutdown losses + major stoppages)) / Calendar Time) x 100%

shutdown losses - planned maintenance loss + shutdown maintenance loss
major stoppages - equipment failure loss+ processo failures loss

Rob Nix

Availability, as part of the OEE calculation, has to be determined and defined in advance by the group concerned with the outcome. Different organizations are concerned with different stats.

The SAE R&M Guidelines identifies several different types of "avaliability": 1) achieved, 2) intrinsic, 3) operational, and 4) overall equipment...

Before becoming too dogmatic about what the "A" stands for, we must get the concerned parties together and agree on what is expected.



See the attachment. I should have some more in my archieve, I will look for, and post it.
I like page no. 9, where results from 2 shifts are compared. As always, it is true, that you have to know, what is behind the numbers, for a good interpretation. In my interpretation, the key elements, is planned versus unplanned, and target versus results.




Re: Oee

A discussion was had at work the other day debating the application of scheduled lunches and its impact to the OEE target. Historically our organization has taken a "hit" for counting a scheduled lunch as available time even though no technicians were available to run the equipment. My contention is that it is scheduled downtime, or scheduled to be non-productive and we should adjust our targets accordingly. On the flip side there are some occasions where we staff the line through the scheduled lunch. On those days our OEE is slightly inflated due to our use of available manpower.

How should we measure ourselves?
Thank you for any help.


Involved In Discussions
Hi David,

A - Should be

A = Operating Time/ Planned production time

Planned production time = Shift length- breaks
Operating time= Planned production time - downtime

Normally getteing 85% OEE is considered as world class, my current company OEE is between the range of 72 ~80 % . It also depends on how every company interprets the result.

Thread starter Similar threads Forum Replies Date
Marc Definition OEE (Overall Equipment Effectiveness) - Initials and Definition Definitions, Acronyms, Abbreviations and Interpretations Listed Alphabetically 0
C OEE and In-process Inspection Manufacturing and Related Processes 2
A Add-On software for VMC to calculate setting time, Idle Time, OEE etc.. Manufacturing and Related Processes 2
J How to Calculate OEE Indicator for a Workshop (15 Machines) Lean in Manufacturing and Service Industries 6
R When do I need to calculate Process OEE? Manufacturing and Related Processes 12
M OEE - The meaning of the single number Quality Tools, Improvement and Analysis 12
M Can OEE (overall equipment effectiveness) exceed 100%? Manufacturing and Related Processes 2
M Overview of the relations between OEE and SCOR Quality Tools, Improvement and Analysis 1
M Where does OEE (Overall Equipment Effectiveness) belong? Quality Tools, Improvement and Analysis 11
L OEE (Overall Equipment Effectiveness) and Cost Savings Manufacturing and Related Processes 2
S Measuring OEE (Overall Equipment Effectiveness) for each Job, not for Machine Lean in Manufacturing and Service Industries 2
J Correlation between OEE and FMEA FMEA and Control Plans 2
8 OEE (Overall Equipment Effectiveness/Efficiency) Help Lean in Manufacturing and Service Industries 17
P How to clean paint area tile faster and improve OEE Manufacturing and Related Processes 3
D Overall Equipment Effectiveness (OEE) Calculations Manufacturing and Related Processes 4
AnaMariaVR2 OEE (Overall Equipment Efficiency) on Pharma Packaging Lines Lean in Manufacturing and Service Industries 8
Y OEE (Overall Equipment Efficiency) help Lean in Manufacturing and Service Industries 6
R Building an OEE System to our Production Lines - New concepts to me Lean in Manufacturing and Service Industries 12
somashekar Information sharing: Week 22, 2010 (TPM, OEE) The Reading Room 1
S OEE (Overall Equipment Efficiency) - One question Manufacturing and Related Processes 17
M Calculating OEE Performance Measurement for a CNC Plasma Cutter Manufacturing and Related Processes 19
C Has anyone ever heard of Informance software? Monitors machine uptime/downtime (OEE) Preventive Action and Continuous Improvement 11
S OEE Software - Automating the collection of Overall Equipment Efficiency data Statistical Analysis Tools, Techniques and SPC 8
P OEE (Overall Equipment Efficiency) and Downtime Manufacturing and Related Processes 17
A OEE for Food Manufacturing - Non Dairy creamer manufacturing Manufacturing and Related Processes 1
V Overall Equipment Efficiency (OEE) calculation of 2 different scenarios. Manufacturing and Related Processes 5
P OEE - Is there a company that offers a better display than others? And how effective Lean in Manufacturing and Service Industries 19
M OEE (Overall Equipment Effectiveness) Downtimes Calculation Manufacturing and Related Processes 8
E Control Charts for OEE (Overall Equipment Efficiency) Statistical Analysis Tools, Techniques and SPC 19
L Determining Coordinate Measuring Machine (CMM) OEE General Measurement Device and Calibration Topics 2
A Overall equipment effectiveness - Computing OEE taking all machines taken together Manufacturing and Related Processes 12
H OEE (Overall Equipment Effectiveness) and Run at Rate IATF 16949 - Automotive Quality Systems Standard 5
P How Do I Measure Productivity? Throughput yield? OEE measures? Misc. Quality Assurance and Business Systems Related Topics 3
A OEE - Overall Equipment Effectiveness QS-9000 - American Automotive Manufacturers Standard 1
A OEE - Overall Equipment Effectiveness - A Ford Requirement Customer and Company Specific Requirements 7
T Quality Document Definition AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 7
K Whether the product is an accessory according to the MDR definition EU Medical Device Regulations 3
B Support function definition IATF 16949 - Automotive Quality Systems Standard 12
M Definition of Characteristics Tolerance Gage R&R (GR&R) and MSA (Measurement Systems Analysis) 3
N Definition of article, complex object, substance REACH and RoHS Conversations 1
I IAQG AS9104 Definition of Employee AS9100, IAQG, NADCAP and Aerospace related Standards and Requirements 2
K Overhaul definition EASA and JAA Aviation Standards and Requirements 1
P Definition of "Standalone" medical device Other Medical Device Regulations World-Wide 5
S Definition of disease as per medical device defintion EU Medical Device Regulations 14
D Definition of Sub-supplier in chemicals IATF 16949 - Automotive Quality Systems Standard 3
C Is there a definition of accessories for medical devices in China? China Medical Device Regulations 1
T Software Unit definition - IEC 62304 - Medical Device Software Life Cycle Processes 3
T Software user interface - definition of hazards ISO 14971 - Medical Device Risk Management 15
K Definition and Example of Shelf life, Expiry date, Expected service life and Lifetime EU Medical Device Regulations 6
J Machinery Directive : Emergency stop clause : definition of 'portable' or 'hand-guided' machinery Other ISO and International Standards and European Regulations 0

Similar threads

Top Bottom