Cross-Hole Access & Assembly Verification
CNC Prototype DFM: Machining Example
Using a CNC prototype to evaluate machining access, design changes and the assembly effects of revised geometry.
- Process
- Review drill and holder access in the proposed setup
- Materials
- Material per the affected part drawing
- Quantity
- Revised sample quantity per project
- Inspection
- Hole location, alignment and installation clearance
Product Overview
A prototype can reveal design details that require further manufacturing review. Some features are dimensionally possible but difficult to approach with a cutting tool or fixture. An effective DFM review considers the machining operation and the function of the finished feature together.
Key Features
- Consider a bracket with a flange obstructing the proposed drilling path to a cross-hole.
- The drilling tool may have insufficient clearance even when the finished hole geometry is otherwise valid.
- One possible solution is to reposition the hole, provided the mating design allows the change.
Manufacturing Considerations
- Before approving relocation, assess the permissible centerline movement, tool and holder access, and remaining material near the edge.
- The revised geometry must also preserve the required fastener alignment and installation clearance.
- Any necessary changes to mating components should be evaluated together.
Quality Control & Inspection
- Update the affected drawings and CAD models before manufacturing the revised sample.
- Inspect the new hole location against the approved references.
- Where a functional assembly trial is specified, evaluate fastener alignment and access using the relevant mating geometry.
Specifications to Confirm
| Centerline movement | Agree how far the hole may move before revising the drawing. |
|---|---|
| Tool clearance | Check the drill and holder envelope past the flange in the proposed setup. |
| Remaining edge material | Confirm that the approved hole position leaves enough material at the edge. |
Assembly Considerations
Mating geometry
Review any corresponding change to the mating hole or fastener position.
Fastener access
If an assembly trial is specified, verify alignment and installation clearance on the revised sample.
Related Products
Discuss a CNC DFM Review
Send your drawing or model with difficult-to-machine features and relevant assembly details. We can review manufacturing access and potential design alternatives before quotation or prototype production.
