A charger quotation that lists tooling as a cost but not as a duration is an incomplete quotation. For a new enclosure or a new plug mechanism, tooling is frequently the longest single item in the programme — and the only one that cannot be shortened by paying for overtime.
The realistic sequence
Design freeze and 3D review first, then mould flow analysis if the housing is thin or the wall sections are uneven. Steel cutting and electrode machining follow, then the first trial shot (T1), then dimensional measurement and the corrections that always follow, then T2 and T3, then colour and texture approval, then a small pilot run. For a simple housing on an existing platform that is a matter of weeks; for a new plug mechanism with moving parts it is longer, because the mechanism has to pass the retention and durability tests before it can be released.
Where the time actually goes
Not in cutting steel. It goes in the loop between trial shots and corrections: measure, adjust, re-shot, re-measure. Two or three loops is normal, and each one costs days plus queue time at the tool shop. Programmes that run late almost always compressed the number of loops on paper rather than eliminating the reason for them.
What can be compressed honestly
Three things. Reusing an existing platform’s housing eliminates tooling entirely. Reusing a housing but changing colour or texture needs only a moulding batch and a finish approval. And locking the mechanical design before the artwork starts removes the queue at the tool shop, because the tool shop is shared.
How to plan around it
Put tooling on the critical path and give it its own dates: design freeze, T1, T3, colour approval, pilot. Then schedule the certification project against the pilot sample rather than the engineering sample, and the marketing launch against the certification reports rather than the production date. Programmes that sequence it this way do not slip; they simply start earlier.