Manufacturing Production Planning & Scheduling Guide

Introduction

Effective production planning and scheduling is the foundation of successful manufacturing operations. This guide explores best practices for material requirements planning (MRP), capacity planning, work order management, and shop floor control using modern ERP systems.

Material Requirements Planning Fundamentals

MRP determines what materials are needed, how much is needed, and when they are needed to support production schedules.

Bill of Materials Structure

Accurate BOMs are critical to effective MRP. Each finished good must have detailed BOM listing all components, subassemblies, and raw materials with accurate quantities, units of measure, and lead times.

Master Production Schedule

MPS represents demand for finished goods from customer orders and forecast. MPS drives the entire planning process, so accuracy is essential. Balance between firm customer orders and forecast based on your business model.

MRP Calculation Logic

MRP explodes MPS through BOMs to determine gross requirements for each component. Net requirements are calculated by subtracting on-hand inventory and scheduled receipts from gross requirements. Purchase orders and work orders are generated for net requirements.

Planning Parameters

Set appropriate planning parameters including lead times, safety stock, reorder points, order quantities (economic order quantity vs. lot-for-lot), and planning horizons. These parameters significantly impact inventory levels and service levels.

Capacity Planning

While MRP determines material requirements, capacity planning ensures you have sufficient production capacity to execute the plan.

Rough-Cut Capacity Planning

RCCP validates that MPS is feasible given available capacity at critical work centers. Identify potential capacity constraints early before detailed scheduling.

Work Center Definition

Define work centers with available capacity, efficiency factors, and scheduling rules. Work center capacity drives production scheduling and identifies bottleneck operations.

Capacity Requirements Planning

CRP calculates detailed capacity requirements for each work center based on planned work orders. Compare required capacity to available capacity and resolve conflicts through overtime, subcontracting, or schedule changes.

Finite vs. Infinite Loading

Infinite loading schedules work without regard to capacity constraints—useful for initial planning. Finite loading respects capacity limits and produces realistic schedules but requires more detailed data and processing.

Work Order Management

Work orders authorize production, track progress, and collect costs. Effective work order management is essential for shop floor control.

Work Order Creation

Generate work orders from MRP, directly from sales orders, or manually. Each work order specifies item to produce, quantity, required materials, routing operations, and scheduled start/finish dates.

Material Allocation

Allocate materials to work orders based on BOM. System reserves allocated materials and prevents them from being consumed by other work orders. Release materials to shop floor when production begins.

Routing and Operations

Define production routing specifying sequence of operations, work centers, setup times, run times, and move times. Use routings for scheduling, costing, and shop floor tracking.

Work Order Status

Track work order lifecycle through statuses such as planned, released, in-progress, completed, and closed. Status determines which transactions are allowed and how work order appears in reports and planning.

Shop Floor Control

Real-time tracking of production activities enables accurate costing, on-time delivery, and continuous improvement.

Operation Reporting

Operators record start/stop times, quantities produced, scrap, and downtime for each operation. Use shop floor terminals, tablets, or mobile devices for data collection.

Material Consumption

Record actual material consumption against work orders. Compare actual to standard and investigate variances. Use backflushing to automatically consume materials at predetermined points in the routing.

Scrap and Rework

Track scrap reasons and quantities at each operation. Create rework orders when defective items can be recovered. Analyze scrap patterns to identify quality improvement opportunities.

Shop Floor Visibility

Provide real-time dashboards showing work order status, operation progress, machine utilization, and pending orders. Visibility enables proactive management and rapid problem resolution.

Advanced Planning Techniques

Beyond basic MRP, several advanced techniques can improve planning effectiveness.

Demand-Driven MRP

DDMRP positions strategic inventory buffers to decouple supply chain variability from production schedules. This approach reduces nervousness and improves on-time delivery in high-variability environments.

Theory of Constraints

TOC focuses planning on the bottleneck operation. Optimize bottleneck utilization, subordinate non-bottleneck operations, and maintain appropriate buffers to protect the bottleneck.

Advanced Planning and Scheduling

APS systems use optimization algorithms to generate schedules that maximize throughput, minimize lead times, or achieve other objectives while respecting capacity and material constraints.

Demand Forecasting

Implement statistical forecasting methods to predict demand for make-to-stock items. Use techniques such as moving averages, exponential smoothing, or seasonal models based on demand patterns.

Conclusion

Effective production planning and scheduling requires disciplined processes, accurate data, and appropriate use of ERP capabilities. Master the fundamentals of MRP and capacity planning before attempting advanced techniques. Systech Precision ERP provides comprehensive production planning and shop floor control capabilities designed specifically for manufacturing companies.