Short, practical notes on precision machining, measurement and engineering planning.
These notes summarise the core principles we discuss with customers: how a part will be machined, how it will be held and how it will be measured.
Most of a part's cost and lead time is decided before the first machine set-up. The drawing and 3D model are reviewed together for tool access, corner radii, deep pockets, thin walls and clamping surfaces.
Outcome: open questions are clarified with the customer before work starts.
In 3+2 machining, two rotary axes tilt the part to a fixed orientation and cutting is then carried out with the three linear axes. In simultaneous 5-axis machining, all five axes move together while cutting.
Outcome: the method is chosen by geometry and tolerance requirement, not by habit.
Datums are taken from the features that define how the part functions in its assembly. Aligning the machining reference and the measurement reference with the drawing's datum system directly affects how results can be interpreted.
Outcome: the part is referenced and measured the way it will be used.
When measuring a bore, the stylus tip contacts the inner cylindrical wall. Three points define a circle mathematically, but evaluating form characteristics such as roundness and cylindricity requires more points or continuous scanning, taken at more than one depth.
Outcome: the measurement strategy follows what the tolerance actually controls.
A part has six degrees of freedom. They are constrained with three locating points on the primary surface, two on the secondary and one on the tertiary surface. Clamping forces should push the part onto these locators, not distort it.
Outcome: a good fixture is also the basis of repeatable measurement.
Thin walls used to save weight in aerospace parts can distort under cutting forces, residual stress and clamping. Machining sequence, stock allowance and toolpath strategy are planned to reduce that risk.
Outcome: dimensional stability is treated as part of the machining plan.
Send us your drawings and requirements, and we will plan the right manufacturing approach together.