Quoted from PinStalker:Where this guy gets it wrong (IMO) is using a "just in time" supply chain..... which is total garbage.
He's sure feeling it now.
You have to have a solid inventory of every needed part on-hand, or you're at the mercy of a single delayed delivery stopping you cold.
Every industry has had to learn this the hard way...... ain't no cheap shortcuts to building things.
"Just in time" drives up costs like crazy, even though people are deceived by the "lean manufacturing" lie.
nah - it's just not a concept that is universal nor does it scale down the same.
Toyota was still buying parts by the tens of thousands and improved things by doing that... because it was a change from ordering a million at once and then bogging themselves down with that legacy.
That works because you can still work within the constraints of their industry and suppliers so that the batches are still at good effective points, and you work to diversify your suppliers.
That doesn't mean you can scale it down to 20 at a time... because there you do fall below critical thresholds and the good effective operating points for handling that inventory and too small for the suppliers as well. Like, it doesn't make sense to do inspection on so few parts, making overhead bloom, slowing things down. Nor is it as effective for shipping, manufacturing, etc.
TLDR - you have to apply the concepts to your model and your supplier constraints - it's not something you can apply blindly.
Pinball is specialized, low volume, narrow supplier funnels, and heavy on BOM complexity. Trying to scale down to 10s instead of hundreds just makes everything harder.
Same reason JPOP's original 16 magic girls was such a stupid idea from the start.