5-Axis Strategy for Aerospace Aluminium Bracket: One Setup, Fewer Fixtures

A five-axis machining case study on a structural bracket machined from 7075-T6 plate: why the part suited a single-setup strategy, how the toolpath was programmed and simulated, how it was held and verified, and what it saved.

Why five axes

The part has features on several faces that must be related to each other, and every extra setup adds an opportunity for error.

Machining a structural bracket machined from 7075-T6 plate in one setup removed re-fixturing and the datums shift that comes with it.

Programming and simulation

The toolpath was generated against the solid model and simulated with the machine kinematics, holder and fixtures included, so collisions were found on screen.

Tool axis control kept the cutter normal to the surface and let us use a shorter tool for better rigidity.

Workholding

A low-profile fixture held the part on a non-critical face, giving the spindle access to every feature without a re-clamp.

The fixture also served as the inspection reference, so measurement and machining used the same datums.

Verification

The critical relationships were verified on a coordinate measuring machine in a single setup, using the model as the reference.

The requirement, 2 mm walls with a profile tolerance of plus or minus 0.05 mm, was reported for the first article and for the agreed sample plan.

What it saved

Combining operations in one setup removed fixture changes, reduced handling damage and shortened the overall lead time.

Accuracy improved at the same time, because the relationships between features no longer depended on how carefully an operator re-clamped the part.

Summary

Documented results, retained samples and a named contact on each side are what turned this from a one-off order into repeat business.