Page Comparison

The purpose of this article is to explain how to calculate and describe the significance of values in the Machine Level - Hourly View on the Whiteboard.

Table of contents

Table of Contents

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OEE Metrics Calculations

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The following table shows how items in the quick view are calculated:

Quick View	Machine Status	Key Numbers (Parts)	Duration	Equation	Math Calculation	Description
Image Modified	Uptime	97	30.1 mins	`Uptime parts` = `Runspeed (Parts/mins)` * `Uptime Duration (mins)`+ `Running Type (Gain)` - `Scrap Parts`	97 = 3.158 * 30.1 + 3 -1	Produce 97 parts in running state/uptime. No downtime issues happening in this duration
Image Modified	Downtime	76	24 mins	`Downtime parts` = `Runspeed (Parts/mins)` * `Downtime Duration (mins)`	76 = 3.158 * 24	It should have produced 76 parts but failed. Micro-stoppage and idle status are triggered in this period
Image Modified	Unscheduled	18	5.9 mins	`Unscheduled parts` = `Runspeed (Parts/mins)` * `Unscheduled Duration (mins)`	18 = 3.158 * 5.9	Unscheduled production values (18 parts)
Image Modified	Opportunity	77	24.3 mins	`Potential parts` = `Runspeed (Parts/mins)` * `Opportunity Duration (mins)`	77 = 3.158 * 24.3	It shows the extra capacity (77 parts) which can be considered to maximize the total production
Image Modified	Scrap	1	18 sec	Scrap values added manually	N/A	Bad parts, reported by customers

Info
Technically, we assume Runspeed is a fixed value for all periods.

The following table shows how the values in the OEE gauge and the Cycle Gauge are calculated.

Gauge Type

Quick view

Description

OEE

Image Modified

Numerator = Good Production = Uptime parts = Runspeed (Parts/mins) * Uptime Duration (mins)+ Running Type (Gain) - Scrap Parts

97 = 3.158 * 30.1 + 3 -1

Denominator = Expected Goal = Uptime Parts + Opportunity Parts - Running Type (Gain)

171 = 97 + 77 - 3

OEE = Good Production / Expected Goal

57% = 97 / 171

Cycle

Image Modified

Numerator = Production time = (Uptime Duration / Uptime Parts) * 60 (Unit conversion) in seconds

18.5 = (30.1 / 97) * 60

Denominator = Scheduled Cycle time

Cycle time = 18.999 = 19.0 s (See job window)

Variance = 18.5s - 19.0s = -0.5s

Example 3: Production without Jobs

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If a machine is not running on a job, the way calculations are done changes. In this case, the Machine Rate (prod/min) can be found in the PEConfig settings. For this example, the Machine Rate (prod/min) = 180

Quick View	Machine Status	Key Numbers (Parts)	Duration	Equation	Math Calculation	Description
Image Modified	Uptime	5632	55.7 mins	`Uptime parts` = (`Machine rate` * `Uptime`) - `Running Type (Loss)`	5632 = 180 * 55.7 - 4387	Produce 5632 parts in running state/uptime.
Image Modified	Downtime	781	4.3 mins	`Downtime parts` = `Machine rate` * `Downtime Duration`	781 = 180 * 4.3	It should have produced 781 parts but failed. Idle status are triggered in this period.
Image Modified	Opportunity	781	4.3 mins	`Potential parts` = `Machine rate` * `Opportunity Duration`	781 = 180 * 4.3	Opportunity production values (781).

Gauge Type	Quick view	Description
OEE	Image Modified	Numerator = `Good Production` = `Uptime parts` = `(Machine Rate` * `Uptime`) - `Running Type (Loss)` 5632 = 180 * 55.7 - 4387 Denominator = `Expected Goal` = `Machine rate` * `Planned Productive Time` 10800 = 180 * 60 `OEE` = `Good Production` / `Expected Goal` 52% = 5632 / 10800
Availability	Image Modified	`Availability` = `Uptime` / `Planned Productive Time` `Uptime` = 55.7 = 56 mins `Planned Productive Time` = 1 hr = 60 mins 93% = 56 / 60
Performance	Image Modified	`Performance` = ( `# of parts produced`) / (`Machine Rate` * `Uptime`) `# of parts produced` = `Uptime production` = (`Machine Rate` * `Uptime`) - `Running Type (Loss)` 5632 = 180 * 55.7 - 4387 `Machine Rate` * `Uptime` = 180 * 55.7 = 10019 56% = 5632 / 10019
Quality Ratio	Image Modified	`Quality Ratio` = [(`Number of parts produced`) - (`Number of parts rejected`)] / (`Number of parts produced`) `# of parts produced` = `Uptime production` = (`Machine Rate` * `Uptime`) - `Running Type (Loss)` 5632 = 180 * 55.7 - 4387 `Number of parts rejected` = `Scrap` = 0 100% = 5623 / 5623