Two bored regions are joined across a central opening. The opening provides clearance but reduces support compared with a solid block; bore relationships and mounting-face geometry therefore need to be controlled together.
Paired-bore relationship
Mounting feet and base
Central window and edges
02 · MACHINING CHALLENGES
Where geometry shapes the machining approach
01
Paired bore relationship
CHALLENGE
Separate setups can preserve each hole size while losing their relative alignment.
PROCESS CONTROL
Where access permits, finish paired features from a shared reference and check their relationship explicitly.
02
Open bridge stiffness
CHALLENGE
Opening the centre changes how the arms respond to clamp force.
PROCESS CONTROL
Balance roughing and preserve support before final bore and base finishing.
03 · MANUFACTURING APPROACH
From locating datums to finished interfaces
01
Connect the bore and base datums
Define the specified relationship between the bores and mounting faces, then carry that datum system into each setup.
02
Retain stiffness around the bridge
Balance rough stock removal and retain support near the bridge feet before finishing the functional features.
03
Finish the paired features and clearance edges
Finish the bores and base, deburr the opening and check the specified geometric relationships after release.
04 · INSPECTION FOCUS
Check the features that govern assembly
01
Paired-bore relationship
Inspection method
Measure the specified bore relationship against the common drawing datums.
Functional purpose
Keep the bore relationship consistent with the drawing.
02
Mounting feet and base
Inspection method
Check the specified mounting surfaces after releasing the fixture in the agreed support condition.
Functional purpose
Maintain the intended mounting contacts.
03
Central window and edges
Inspection method
Check clearance boundaries and burr removal without rounding functional locating edges.
Functional purpose
Preserve clearance without damaging functional edges.
