Lean Scheduling and Theory of Constraints

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    Lean Scheduling and Theory of Constraints - Presentation Transcript

    1. VISUALize the Rebound – Graphicast’s Path Through the Dark Recession Forest
    2. Graphicast, Inc.
      • Founded in 1978
      • Located in Jaffrey, NH
      • Contract manufacturer of machined, zinc alloy castings
        • In-house design, mold making, casting, machining capabilities
        • Proprietary, graphite mold casting process creates high density castings with exceptional surface finish
        • Most applications are high valued added machine components
    3. A Long Time VISUAL User
      • Implemented VISUAL in July 1999
      • The impetus for selecting VISUAL was the scheduling capability
      • VISUAL consolidated all operational and financial activity
      • We developed numerous Crystal reports running off the VISUAL database
        • Provide detailed analysis of sales, financial, and operational information for fine tuning the business
    4. Some Scheduling Problems Persisted
      • The machine shop was booked solid 8 weeks in advance
      • Normal shop floor issues wreaked havoc with the schedule
      • The schedule wasn’t pulling jobs in if previous jobs finished early
      • Rush orders were very disruptive to the schedule and caused late shipments
      • The schedule tried to break into jobs to improve lead times
      • Ultimately, the schedule was not able to efficiently reflect the nature of our business. We needed a different scheduling solution. Fortunately, we found the solution just before the economy collapsed.
    5. What’s behind Lean Scheduling
      • Lean scheduling is based on Goldratt’s Theory of Constraints (TOC) introduced in the business novel, “The Goal”
      • Utilizing TOC in production
        • Identify the constraint that limits the throughput of the system
        • Relieve or eliminate the constraint to free the system to operate at its peak level
          • If you have a production constraint, add extra shifts, add a second machine or use unconstrained machines to produce the same part
          • If you have a “between the ears” constraint, change restrictive policies and procedures
          • If you have a market constraint, increase throughput (sales revenue)
    6. What’s behind Lean Scheduling - continued
      • TOC scheduling relies on three components
        • “ Drum” – The pace of the “constraint”
        • “ Buffer” – Some amount of WIP or time that protects the constrained component
        • “ Rope” – A signal to upstream operations to release work into the system
      • TOC thinking is consistent with Lean and Six Sigma
        • Use TOC to focus on constraints
        • Use Lean or Six Sigma techniques to improve and stabilize operations
    7. System With an External Constraint Market too small for your capacity – the constraint DRUM ROPE Work Order Release SHIPPING BUFFER - TIME
    8. The Impact of Lean Scheduling
      • Lead times dropped to four weeks from sixteen weeks
      • Practically eliminated overtime
        • Savings of about $100,000 per year
      • Went to four day work week
        • Bonus to employees for losing overtime
        • Reduced electric bill by 15%
    9. The Impact of Lean Scheduling - continued
      • Reduced Inventory by 30%
        • Freed up about $100,000 of cash
      • Effectively doubled plant capacity
        • Overall plant utilization is about 50%
        • Plenty of capacity to handle rush orders without impacting on-time deliveries
        • No increase in equipment or employees needed to grow
      • Major issue is now increasing throughput
    10. A minimal amount of oversight day to day
      • Simple reports
        • VISUAL Planned Load
        • VISUAL Resource Operations Buffer Status
        • Plant Wide Buffer Status - Crystal
      • Simple scheduling
        • Floor supervisors decide where to run jobs
        • Minimal management involvement
    11. A minimal amount of oversight day to day - continued
      • Lean Scheduling efficiently reflects our day to day operations
        • Rapid changes
        • Rush orders
        • Capacity planning
      • Very quick “what-if” analysis
        • Increasing or decreasing bookings
        • Impact of overtime, personnel levels, vacations or absences
      • We do not have a scheduling person
    12. “ Driving Business Innovation to Improve Business Performance”
      • Savings
        • From day one of the Lean Scheduling transformation
      • Payback
        • 2 ½ months for the entire investment in Lean Scheduling
      • Fingertip Information
        • Lean Scheduling gave us a rapid and efficient response tool to the current economic crisis
      • Recognition
        • Graphicast received a 2009 PM100 award from Managing Automation Media for the Lean Scheduling project
          • “ Progressive Manufacturing” awards were bestowed on the 100 companies deemed to have most effectively used innovative methods to improve business performance.

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