# C14 optical inspection fixture

Internal DPM development brief. Current status and results to be supplied.

## Brief
A resin plate mounts to a rigid laboratory frame through four holes. A central insert transfers short static loads. The redesign must preserve these interfaces and reduce resin volume without losing the required fixture function.

## Requirements to confirm
- Preserve the four mounting-hole interfaces and central insert interface.
- Define the optical clearance envelope, alignment requirement and allowable movement before evaluating variants.
- Confirm the static load magnitude, direction, duration, mounting conditions and resin condition.
- Measure resin volume separately from support material, scrap and total printed mass.

## Design and iteration
- Capture the existing plate, interfaces, baseline volume and manufacturing record.
- Compare controlled changes to material distribution while protecting interfaces and load transfer.
- Use appropriate analysis to shortlist variants; record boundary conditions, assumptions and predicted displacement.
- Manufacture and inspect selected variants, then compare measured behaviour with the baseline.

## Manufacture
Use in-house resin printing where the material, process and equipment are available and suitable. Record resin batch, orientation, supports, exposure settings, washing, cure and dimensional inspection. Identify frame, insert and any machined or fabricated operations separately.

## Evidence to collect
- Baseline and revised net resin volume from the same CAD method.
- As-built mass and print/support consumption reported separately.
- Mounting-hole and insert-interface inspection.
- Deflection and residual movement under the agreed short static load, with a defined measurement setup.
- Fit, optical access and repeatability of the assembled fixture.

## Publication record
Project owner: pending
Current stage: pending
Baseline revision: pending
Design revision: pending
Manufacturing records: pending
Predicted results: pending
Measured results: pending
Measurement uncertainty: pending
Reviewed by/date: pending
DBOS contribution: pending
In-house operations: pending
Partner operations: pending
Images and film references: pending