Microhole inspection starts with a practical question: what needs to be verified for the component to work as intended? A clear microscope image can show an opening, but it does not automatically establish the internal geometry or performance of the complete passage.
This guide connects the critical features to the inspection questions worth resolving before a quote. Our microholes spotlight covers the broader design topic.
Start with the Drawing Requirement
List the characteristics that determine acceptance. These may include entrance diameter, exit diameter, hole location, bore shape, edge condition, or a functional result. Each characteristic needs an appropriate verification approach.
Also identify the required measurement locations. A diameter at the top surface is different from a diameter below a chamfer. If the smallest internal section controls function, measuring only the largest visible opening will not answer the right question.
Separate Visible Features from Internal Geometry
Optical measurement can be useful for accessible openings and pattern locations when the equipment, lighting, and part geometry support the required measurement. It does not necessarily reveal the full bore.
Internal requirements may need a different approach. Depending on feasibility, options can include sectioning a sample or evaluating a suitable three-dimensional measurement method. Sectioning is destructive. A nondestructive method still needs to demonstrate adequate access, resolution, and measurement uncertainty for the material and feature.
Agree the method for the actual part. A general statement that a laboratory has CT or microscopy equipment does not establish that it can verify every micron-scale hole requirement.
Check Taper and Edge Condition Explicitly
Entrance and exit diameters help describe taper, but they cannot establish every internal change in diameter. If profile or minimum clearance is critical, include that requirement separately. Our microhole taper guide explains the geometry.
Edge inspection is another task. Define how microhole burrs and edge quality will be accepted, including any limits on projections or loose debris. The visual method should make the relevant defect visible at the scale required.
Inspect the Pattern as Well as Individual Holes
A multi-hole component needs a plan for the array. Hole count, missing openings, location relative to datums, and spacing can all matter. A repeated diameter check alone does not verify that the pattern occupies the correct position on the finished part.
Decide whether the application requires checking every opening or an agreed sample. Define how results will be recorded, especially when the part contains many features. See our microhole array guide for the drawing details that support this review.
When Is a Functional Test Useful?
A flow requirement can justify a functional test under specified conditions. Define the medium, pressure conditions, temperature where relevant, and acceptable result. This can answer a different question from dimensional inspection.
Functional testing should not silently replace drawing verification. Agree which requirements each test demonstrates. Likewise, acceptable dimensions alone do not establish a particular flow rate unless that relationship has been established for the application.
Include Microhole Inspection in Your RFQ
Send the drawing and identify critical dimensions, sample or production quantities, required reports, and any destructive-test restrictions. Include customer acceptance procedures where they apply.
- Upload your CAD file or drawing
- Review custom dimensions and material options
- Receive engineering support for your application