Why are they not using LinuxCNC to make transmission parts at the Toyota factory? ... It must be something about LinuxCNC that makes it unsuitable.
Large companies want a known brand high end machine with a comprehensive support contract. Big CNC manufacturers use either their own control or a big name control manufacturer such as Siemens. If they have their own control they aren't going to switch to anything else because they have a huge amount of time and money invested in their current systems. If they use someone else's control they want a complete hardware + software package with support. Either way they aren't going to even consider LinuxCNC and that is unlikely to change, no matter how good LinuxCNC is.
Smaller CNC manufacturers are a different story. There are a number of smaller plasma and CNC router manufacturers using LinuxCNC with considerable success. Tormach is another example of a smaller manufacturer using LinuxCNC to run a range of CNC machines.
and is basically just a kt of parts and not a product and it does not scale well to large factory floor sized systems.
LinuxCNC is a small open source project. It could scale well for large machines but it doesn't have the comprehensive support you would get from a closed source control manufacturer. For end users time is money so support is a major deciding factor.
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