Six useful questionsDescribe what you need from visible thread feature inspection before choosing a solution
For in-line inspection using visible thread-feature inspection, share the normal condition, realistic range and difficult cases the finished system must handle.
Question 1Visible Defect or Measurement Definition for Visible Thread-Feature Inspection
Use drawings and representative parts to define the visible thread feature, defect limits and required decision. Identify the surfaces exposed to the proposed views, and record functional fit or other requirements that need gauging or a separate test.
Question 2Good, Bad and Marginal Sample Range
Include good, bad and marginal parts, normal production variants and credible extremes. Record drawing revision, supplier, batch and sample condition where relevant, and identify which examples represent accepted, rejected or borderline cases.
Question 3Part Presentation and Production Speed
Describe how each part is located or rotated, which thread surfaces are exposed and the production speed range. Trial presentation and timing with representative parts under normal, difficult and fault conditions.
Question 4Optics, Lighting and Environmental Conditions
Record the proposed views, lighting and environmental conditions, including reflective, dirty or damaged cases. Use an optical trial to establish repeatable contrast for the defined visible feature, and record any surfaces the setup cannot assess.
Question 5Recipe, Reject and Line-Control Interfaces
List inspection recipes, upstream and downstream states and the required reject response. Agree line handshakes, permissives, faults, recovery and result records, with operator, cleaning and maintenance access included.
Question 6False-Accept, False-Reject and Challenge Criteria
Agree the challenge method, repetitions, acceptable ranges and result records for false accepts and false rejects. Include marginal examples and normal, difficult and fault scenarios, and define the response when an observed result falls outside the agreed range.