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by Dr. David M. Anderson, P.E., CMC
Copyright © 2018 by David M. Anderson
Stopping counter-productive policies before change can start
for instance, if "cost" is defined ascounterproductive_policies. BOM entries, that will discourage standardization
because, in most cases standard parts are "better" than needed, but total cost is less
Standardization. The following practical standardization techniques are presented in all of Dr. Anderson's in-house DFM seminars. Dr. Anderson is an experienced DFM workshop facilitator who can help companies quickly implement standardization.
Dr. Anderson has developed an easy-to-apply standardization1 approach that is more effective than part type reduction measures, which require tremendous efforts for their return. Reducing active part numbers, say from 20,000 to 15,000 will, in fact, lower material overhead somewhat, but may not reach the threshold (eliminating part related setup) that would enable the plant to build products flexibly without delays and setups to get the parts, kit the parts, or change the part bins.
This is a very effective technique to reduce the number of different parts (part types) by standardizing on certain preferred parts. This usually applies to purchased parts but it could also apply to manufactured parts. The methodology is based on a zero-based principle that asks the simple question: "What is the minimum list of part types we need to design new products?" Answering this question can be made easier by assuming that the company (or a new competitor) has just entered this product line and is deciding which parts will be needed for a whole new product line. One of the advantages of new competitors the ability to "start fresh" without the old "baggage:" too many parts. Just image a competitor simultaneously designed the entire product line around common parts. Now image doing the same thing internally. This is called the zero based approach.
The zero based approach, literally, starts at zero and adds only what is needed, as opposed to reducing parts from a overwhelming list. An analogous situation would be cleaning out the most cluttered drawer in a desk, a purse, or a glove compartment; removing unwanted pieces would take much effort, and still not be very effective. The more effective zero-based approach would be to empty everything, and add back only the items that are essential. Where the "clutter" ends up is the difference in the approaches: in the drawer, purse or glove compartment or in the garbage can. Similarly, parts reduction efforts have to work hard to remove the clutter (excess part variety) in the system, whereas zero-based approaches exclude the clutter from the beginning. The clutter is the unnecessary parts that would have not been needed if products were designed around common parts. Not only do these excess parts incur overhead costs to administer them, they also lower plant efficiency and machine utilization because of the setup caused by product that are designed to have more parts than can be distributed at every point of use.
This approach determines the minimum list of parts needed for new designs and is not intended to eliminate parts used on existing products, except, when the common parts are functionally equivalent in all respects. In this case the new common part may be substituted as an equivalent part or a "better-than" substitution, where a common part with a better tolerance can replace its lesser counterpart in existing products.
Even if part Standardization efforts only apply to new products, remember that in these days of rapid product obsolescence and short product life cycles, all older products may be phased out in a few years.
When Dr. Anderson applied these techniques at Intelís Systems Group, he reduced 20,000 active part numbers to 500 part types! Of 2,000 resistors, capacitors, and diodes, he reduced 2,000 to 35 values.
Tool Standardization. A subject related to part Standardization is tool Standardization, which determines how many different tools are required for assembly, alignment, calibration, testing, repair, and service. Company-wide tool standardization can be determined as follows: Analyze tools used for existing products. Prioritize usage histories to determine the most "common" of existing tools. Work with people in manufacturing/service to determine tool preferences. Coordinate common tool selection with common part selection. Issue common tool lists with common parts lists.
Feature Standardization. "Features" are any geometry that requires a separate tool like a drill, ream, hole punch, bend radii, and cutting tool bit for machine tools. These tools need to be standardized using the same procedures as parts.
Raw Materials Standardization. If raw materials can be standardized, then the processes can be flexible enough to make different products without any setup to change materials, fixturing mechanisms, or cutting tools. Raw material Standardization can apply to bar stock/tubing, sheet-metal, molding/casting, protective coatings, and programmable chips.
Process Standardization. Standardization of processes results from the
concurrent engineering of products and processes to ensure that the processes
are actually specified by the design team, rather than being left to
chance or "to be determined later." Processes must be coordinated and
common enough to ensure that all parts and products in the mass customization
platform can be built without the setup changes that would undermine flexible
manufacturing. Example: auto-feed screwdrivers.
Standardization of parts helps part suppliers rationalize their product lines and allow them to:
C reduce their overhead costs and subsidies, which allows them to be more cost competitive
C improve their operational flexibility, resulting in better delivery.
C simplify their supply chain management,
C free valuable resources to improve operations and quality, implement better product development practices, and introduce new capabilities like build-to-order & mass customization.
C Cost Reduction
1. David M. Anderson, Design for Manufacturability & Concurrent Engineering; How to Design for Low Cost, Design in High Quality, Design for Lean Manufacture, and Design Quickly for Fast Production (2004, 432 pages; CIM Press 805-924-0200; www.design4manufacturability.com/books.htm); Chapter 5, "Standardization." Click here for the book description and order form.
Dr. Anderson is a California-based consultant specializing in training and consulting on build-to-order, mass customization, lean/flow production, design for manufacturability, and cost reduction. He is the author of "Design for Manufacturability & Concurrent Engineering; How to Design for Low Cost, Design in High Quality, Design for Lean Manufacture, and Design Quickly for Fast Production" (2008, 448 pages; CIM Press, 1-805-924-0200; www.design4manufacturability.com/books.htm) and Build-to-Order & Mass Customization, The Ultimate Supply Chain Management and Lean Manufacturing Strategy for Low-Cost On-Demand Production without Forecasts or Inventory" (2008, 520 pages; CIM Press, 1-805-924-0200, www.build-to-order-consulting.com/books.htm).
Dr. Anderson can be reached at (805) 924-0100 or email@example.com
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copyright © 2018 by David M. Anderson