Who gets flogged when the cost of new products are too high? Manufacturing. Who does not? Design. Who gets stuck running cost reduction projects when costs are too high? Manufacturing. Who does not? Design. Who gets the honor of running kaizens when value stream maps don’t have enough value? Manufacturing. Who designs out the value and designs in the cost? Design. (That’s why they’re called Design.) If Design designs it in, why is the cost albatross hung around Manufacturing’s neck?

It sucks to be a manufacturing engineer – all the responsibility to reduce cost without the authority to do it. The manufacturing engineers’ call to arms –

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Reduce cost, but don’t change anything!

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Say that out loud. Reduce the cost, but don’t change anything. How stupid is that? We’ll it’s pretty stupid, but it happens every day. And why constrain the manufacturing engineers like that? Because they don’t have the authority to change the product design – only Design can do that. So you’re saying Manufacturing is responsible for product cost, but they cannot change the very thing that creates all the cost? Yes.

What would life be like if we behaved as if Design was responsible for product cost? To start, Design would present product cost data at new product development gate reviews. Design would hang their heads when product costs were higher than the cost target, and they would be held accountable for redesigning the product and meeting the cost target.  (They would also be given the tools, time, and training to do the work.)

Going forward, Design would understand the elements of product that create the most cost. And how would they know this? First, they would spend some time on the production floor. (I know this is a little passé, but it still works.) Second, they would do Design for Assembly (DFA) in a hands-on, part-by-part, piece-by-piece way. No kidding, they would handle all the parts themselves, assemble them with production tooling, and score the design with DFA. That’s right, Design would do DFA. The D in DFA does not stand for Advanced Manufacturing, Operations, Supplier Quality, Purchasing, or Industrial Engineering. The D stands for Design.

I know your manufacturing engineers are in favor of rightly burdening Design with responsibility for product cost. But, your Lean Leaders should be the loudest advocates. Imagine if your Design organization designed new products with half the parts and half the material cost, and your Lean Leaders reduced value waste from there. Check that, Lean Leaders should not be the loudest advocates. Your stockholders should be.

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Measure, measure, measure.  That’s what the black belts say.  However, it’s difficult to do well with product cost since our costing methods are hosed up and our measurement systems are limited. What do I mean? Consider fasteners (e.g., nuts, bolts, screws, and washers), the product’s most basic life form. Because fasteners are not on the BOM, they’re not part of product cost. Here’s the party line: it’s overhead to be shared evenly across all the products in a socialist way.  That’s not a big deal, right?  Wrong.  Although fasteners don’t cost much in ones and twos, they do add up. 300-500 pieces per unit times the number of units per year makes for a lot of unallocated and untracked cost.  However, a more significant issue with those little buggers is they take a lot of time attach to the product.  For example, using standard time data from DFMA software, assembly of a 1/4″ nut with a bolt, locktite, a lockwasher, and cleanup takes 50 seconds.  That’s a lot of time. You should be asking yourself what that translates to in your product. To figure it out, multiply the number nut/bolt/washer groupings by 50 seconds and multiply the result by the number of units per year. Actually, never mind.  You can’t do the calculation because you don’t know the number of nut/bolt/washer combinations that are in your product. You could try to query your BOMs, but the information is likely not there.  Remember, fasteners are overhead and not allocated to product. Have you ever tried to do a cost reduction project on overhead?  It’s impossible.  Because overhead inflicts pain evenly to all, no one is responsible to reduce it.

With fasteners, it’s like death by a thousand cuts.

The time to attach them can be as much as 20-50% of labor. That’s right, up to 50%.  That’s like paying 20-50% of your folks to attach fasteners all day. That should make you sick.  But it’s actually worse than that.  From Line Design 101, the number of assembly stations is proportional to demand times labor time. Since fasteners inflate labor time, they also inflate the number of assembly stations, which, in turn, inflates the factory floor space needed to meet demand. Would you rather design out fasteners or add 15% to your floor space?  I know you can get good deals on factory floor space due to the recession, but I’d still rather design out fasteners.

Even with the amount of assembly labor consumed by fasteners, our thinking and computer systems are blind to them and the associated follow-on costs. And because of our vision problems, the design community cannot be held accountable to design out those costs.  We’ve given them the opportunity to play dumb and say things like, “Those fastener things are free. I’m not going to spend time worrying about that.  It’s not part of the product cost.”  Clearly not an enlightened statement, but it’s difficult to overcome without cost allocation data for the fasteners.

The work-around for our ailing thinking and computer-based cost tracking systems is simple: get the design engineers out to the production floor to build the product.  Have them experience first hand how much waste is in the product.  They’ll come back with a deep-in-the-gut understanding of how things really are. Then, have them use DFMA software to score the existing design, part-by-part, feature-by-feature.  I guarantee everyone will know where the cost is after that. And once they know where the cost is, it will be easy for them to design it out.

I have data to support my assertion that fasteners can make up 20-50% of labor time, but don’t take my word for it. Go out to the factory floor, shut your eyes and listen.  You’ll likely hear the never ending song of the nut runners. With each chirp, another nut is fastened to its bolt and washer, and another small bit of labor and factory floor space is consumed by the lowly fastener.

An expert from his article:

“We in the United States have mistakenly allocated the responsibility for [production] cost to the manufacturing folks. We forget that the cost has already been designed into the product.”

That’s Mike Shipulski, director of engineering with plasma cutting technology provider Hypertherm Inc., reflecting on one of the lessons learned from implementing Design for Manufacturing and Assembly (DFMA) software. The accomplishments include a 600% increase in profit per square foot of factory floor space within a five-year redesign program.  Correspondingly, warranty cost per unit declined more than 75% during the same period, from January 2003 to January 2008.