lead time reduction - part 01

7/31/2019 Lead Time Reduction - Part 01

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Lead Time Reduction

Part- 1

LEANSYSTEM.WORDPRESS.COM

LEARNING TOGETHER ABOUT INDUSTRIAL

ENGINEERING, LEAN PRODUCTION SYSTEM,

SIX SIGMA, AND ERP SYSTEM
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Reducing Lead Time the Most Important

Factor in Achieving World-Class Operations

In the 1960s and 70s, manufacturers competed on the basis of cost efficiency. In the 1980s, quality was

the rage and Zero Defects and Six Sigma came into vogue. Cost and quality are still crucial to

world-class operations, but today, the focus is squarely on speed. Nearly all manufacturers today

are under pressure from customers to cut lead times. And rapid-response manufacturing pays big dividends.

Let's clarify what we mean by lead times. Customer lead time refers to the time span between customer

ordering and customer receipt. Manufacturing lead time refers to the time span from material availability

at the first processing operation to completion at the last operation.

In many manufacturing plants, less than 10% of the total manufacturing lead time is spent actually

manufacturing the product. And less than 5% of total customer lead time is spent in the production process.

The cumulative cycle times of the processes in the value stream are the theoretical limit to how much we

can reduce lead times, without investing in different equipment. Clearly, there is ample opportunity to

reduce lead times in most organizations.

Reducing lead times doesn't involve speeding up equipment to cut the cycle times or getting plant personnel

to work faster. What is does involve is the rapid fulfillment of customer orders and the rapid

transformation of raw materials into quality products in the shortest amount of time possible.


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Reducing Lead Time the Most Important

Factor in Achieving World-Class Operations

Here is a lead time analysis for a product line at a plant we recently visited:

Activity Total Days %

Processing 3 7.5In-transit .5 1.3Set-up/ changeover .5 1.3

In queue 30 75.0On hold-waiting for materials 4 10.0On hold-quality 2 5.0

Total 40 100

At this company, actual production accounted for only 7.5% of the total manufacturing lead time. As in most

plants, the largest contributor to lead time is queue time -- the time product is sitting idle waiting to be

processed at the next operation. Waiting in inventory, tying up cash, adding no value and causingunnecessary customer waiting.


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Implementing Lead Time Reduction

The following guidelines will help you to reduce lead times in your organization:

Measure current lead times and set improvement targets. Lead times, as important as they are, are

not measured in most organizations. People may have a sense as to the planning horizon, but can't say

how long it took for individual products to cross the value stream. Things that are not measured cannot

be improved.

Change the organization from a functional orientation to a product orientation. If possible, all

resources required to produce a product should be located close to each other. These product-focusedgroups are called work cells or cellular manufacturing. Include office operations as these functions

often account for half of total customer lead time.

Cross-train plant personnel within cells in a number of operations for greater flexibility. Reducing

the number of job classifications and maintaining multiskilled teams on each shift is critical to rapid

response manufacturing.

Empower work cells and teams to take ownership for the entire value stream. Drive accountabilityfor product cost, quality and delivery down to the lowest appropriate level (ideally, the operators

themselves).

Continually reduce batch sizes between work centers. With operations in close proximity, transfer

batches can be smaller and WIP inventories can be minimized.

Institute local scheduling between work cells. Visual shop floor scheduling tools, like kanban systems,can be used to minimize WIP between cells and to eliminate queue time throughout the value stream.


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By employing these principles,

many world-class manufacturers have shrunk lead times by 50-80%,

gained market share, improved profitability andincreased employee morale on the shop floor.


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World Class Product Development and

Manufacturing are controlled

by several Laws: The Law of Focus :

The Law of Focus says 80% of the delay in any process is caused by 20% of the activities.

- Based on this we will look for constraints in any system.

The Law of Velocity :

Velocity of any given process is inversely proportional to the number of things in process and

the variation in supply and demand.

- We will always look to be faster, when we are faster we find mistakes earlier, have less

waste in the system and react faster to customer requirements.

The Law of Flexibility :

Process Velocity is directly proportional to the flexibility of a given process.- We will break down large systems into small more flexible ones that give us the

advantage of flexibility and speed.

The Law of the Market:

Customer CTQ Critical to Quality issues are always the highest priority.

- We must listen to the VOC voice of the customer, always satisfying the customer

critical to quality issues first. We only learn when we listen.


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Value Added vs.

Non-Value Added Activity


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Target: Waste = Muda

Value Adding Activity

This is what your customer is willing to pay for. Activities which transform raw materials or

information to fulfill the customer needs.

Non-Value-Adding Activity

Muda or Waste is the activity the customer is not willing to pay for. These activitiesdemand time, space or materials that add no value to the customer.

Non-Value-Added but Necessary

Non-Value Added but necessary activity is Muda or waste activity the customer is not

willing to pay for, but must be performed to complete the work. (e.g. transportation, packing)


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Measure Waste with Time

Time spent between value added steps

Total available hours Value added work time

= Waste (non-value added work time)


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Example: Value-Adding vs. Non-ValueAdding Processes

Incoming Fabric Inspection NVA

Spreading (Fabric Lay) NVACutting VANumbering NVASorting / decoration inspection NVADocoration (embroidery/printing) VATransportation to deco. Subcontractors) NVASewing VAIn-Line Inspection NVA

End of Line Inspection NVARepair / Rework / Re-Test NVAIroning VAPacking NVAFinal Inspection NVA

Which operations below add value?

Value-Added: VA ; Non-Value Added: NVA

lead time reduction - part 01

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