Definition
Machine selection is the decision of which specific machine, among those available in a factory, will run a given operation, based on the operation's requirements and each candidate machine's capability, tooling, fixturing and current workload. It follows process planning and typically produces one of the concrete assignments recorded in a routing.
Why machine selection isn't a fixed lookup
The same operation can be assigned to different machines in different factories, or even in the same factory at different times, depending on machine capability, availability and cost, which is why machine selection is a reasoning problem, not a fixed lookup.
Where machine selection happens
Not on the drawing; it is decided during process planning, after the required operations and tolerances are known, based on which machines in the factory can actually meet them.
Common mistakes
Treating machine selection as a simple capacity lookup (does the part fit the machine's work envelope). Tooling, fixturing, achievable tolerance and current queue length all factor in, and a machine that fits on paper can still be the wrong choice in practice.
The same operation can be assigned to different machines in different factories, or even in the same factory at different times, depending on machine capability, availability and cost, which is why machine selection is a reasoning problem, not a fixed lookup.
See how Blake reviews a partFrequently asked questions
Is machine selection part of process planning?
Yes, it's typically one of the decisions made during process planning, after the required operations are known.
Does machine selection just depend on the machine's work envelope?
No, tooling, fixturing, achievable tolerance and current workload all matter, not just whether the part physically fits.
Can the same part be assigned to different machines at different times?
Yes, as machine availability, tooling and factory capability change, the best assignment for the same operation can change too.