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The C2009 component has an overall envelope of approximately 130.2 × 16.5 × 40.0 mm. Its drawing specifies four Ø6.000 mm F7 through-holes and four Ø11.00 mm through-holes.
The four Ø6 mm holes have specified deviations of +0.010 mm and +0.022 mm, giving an allowable diameter range of 6.010–6.022 mm. The tolerance band is only 12 μm.
The manufacturing challenge: Producing a hole within such a narrow tolerance range requires more than accurate positioning. Tool condition, cutting parameters, workpiece stability, and the finishing method can all affect the final bore diameter. A hole that looks clean may still fall outside the permitted range.
The four precision holes also form part of a larger hole pattern. Their individual diameters and their dimensional relationships must therefore be considered separately during machining and inspection.
The drawing additionally specifies Ra 1.6 μm on the indicated surface, creating a separate surface-finish requirement that must be verified using an appropriate measurement method.
The CY20 component features two Ø5.00 mm F7 through-holes, with an allowable diameter range of 5.010–5.020 mm. The tolerance band is just 10 μm.
The component also includes R3.00, 2 × R5.00, and 2 × R6.00 radii.
The manufacturing challenge: The precision holes and profiled geometry require different types of dimensional control. The bore diameters must remain within their specified limits, while the radii and adjoining contours must match the drawing without unwanted steps or profile deviations.
The general tolerance table specifies ±0.005 mm for dimensions given to three decimal places, unless another tolerance is explicitly specified. These requirements must be interpreted alongside the specific tolerances assigned to individual features.
The Ø6 mm holes on C2009 and Ø5 mm holes on CY20 have tolerance bands of 12 μm and 10 μm, respectively.
At this level, small changes in tool condition, cutting behavior, or workpiece stability can affect whether a finished hole meets its dimensional limits.
The difficulty is not simply machining one acceptable hole. The process must account for every specified bore and provide a reliable way to verify the result.
Our manufacturing approach:
Select a hole-machining and finishing strategy appropriate to the material condition and specified tolerance.
Establish stable workholding to minimize movement during machining.
Control tool condition and cutting parameters throughout the operation.
Verify each critical bore against the drawing's upper and lower diameter limits.
These controls help reduce the risk of out-of-tolerance holes and provide a basis for repeatable manufacturing.
For fixture components, a correctly sized hole is not necessarily a correctly manufactured feature. Hole spacing and position relative to the relevant reference surfaces can also affect assembly and locating performance.
C2009 contains multiple holes distributed along its length. If the machining reference changes between setups, errors can be introduced into the relationships between features.
The manufacturing challenge: Maintaining the intended hole pattern while controlling the individual hole diameters and overall component dimensions.
Our manufacturing approach:
Review the drawing datums and critical hole-center dimensions before machining.
Establish a consistent datum arrangement and stable workholding.
Minimize unnecessary repositioning where the manufacturing setup allows.
Inspect critical hole spacing and positions in addition to individual bore diameters.
The inspection plan must follow the actual drawing requirements. Where positional tolerances are explicitly specified, they should be verified using a suitable method rather than inferred from hole-diameter measurements.
Both components use AISI D2 tool steel. However, the drawings do not establish the material's actual hardness or heat-treatment condition.
These details matter because material condition influences tool selection, cutting behavior, and the appropriate finishing strategy.
CY20 presents an additional challenge: its R3, R5, and R6 features must be machined together with the surrounding contour.
The manufacturing challenge: Selecting a process that suits the actual material condition while maintaining the required profile and avoiding damage to critical features during finishing and deburring.
Our manufacturing approach:
Confirm the material condition before finalizing machining parameters.
Select tools and toolpaths appropriate to the specified geometry.
Plan contour finishing to maintain the required radii and adjoining surfaces.
Control deburring to prevent damage to precision holes and functional edges.
If heat treatment is part of the customer's specification, its sequence and dimensional effects should also be considered in the manufacturing plan.
To address these requirements, the manufacturing process should connect drawing review, machining strategy, and final inspection.
Manufacturing Stage | Key Control Point | Purpose |
|---|---|---|
Drawing review | Hole tolerances, datums, radii, and surface finish | Identify critical features before production |
Workholding setup | Reference surfaces and part stability | Reduce setup-related dimensional variation |
CNC milling | Overall dimensions and machined profiles | Establish the required component geometry |
Precision hole machining | Bore diameter and hole-pattern requirements | Meet specified dimensional limits |
Finishing and deburring | Critical edges, radii, and surface condition | Prevent finishing operations from damaging functional features |
Final inspection | Critical dimensions and applicable tolerances | Verify conformity with the engineering drawings |
The exact operation sequence depends on the approved CAD model, stock geometry, and actual material condition. For tight-tolerance features, the finishing method should be selected according to the required bore geometry and the capabilities of the available equipment.
For this fixture set, inspection should prioritize the features with the most demanding dimensional requirements.
Component | Critical Feature | Drawing Requirement | Inspection Focus |
|---|---|---|---|
C2009 | 4 × Ø6.000 F7 through-holes | 6.010–6.022 mm | Verify each bore diameter |
C2009 | 4 × Ø11.00 through-holes | As specified on drawing | Verify diameter and through-hole condition |
C2009 | Hole pattern | Drawing-defined dimensions | Check specified hole spacing and position |
C2009 | Indicated surface | Ra 1.6 μm | Verify surface roughness |
CY20 | 2 × Ø5.00 F7 through-holes | 5.010–5.020 mm | Verify each bore diameter |
CY20 | R3.00, 2 × R5.00, 2 × R6.00 | As specified on drawing | Verify radii and profile |
Both | Overall dimensions | Drawing dimensions and applicable tolerances | Verify dimensional conformity |
Depending on the feature and tolerance, inspection may use calibrated bore gauges, precision dimensional instruments, coordinate measuring equipment, or surface-roughness measurement equipment.
For the precision holes, the report should record actual measurements rather than only nominal dimensions. Hole-position measurements should be included where required by the drawing.
The drawing defines what must be achieved; the inspection report provides the evidence of whether the finished parts meet those requirements.
This fixture set highlights three important considerations when sourcing precision CNC-machined components:
Tight tolerances require a controlled process. Bore diameters with tolerance bands of 10–12 μm demand appropriate finishing and dimensional verification.
Feature relationships matter. Hole diameter, hole spacing, reference surfaces, and profile geometry must be evaluated according to the drawing.
Inspection must match the engineering requirements. A structured inspection plan helps verify critical dimensions and document conformity.
For engineers and purchasing teams, reviewing these requirements before production helps identify manufacturing risks and establish clear acceptance criteria.
The C2009 drawing specifies Ø6 mm holes with an allowable diameter range of 6.010–6.022 mm, while CY20 specifies Ø5 mm holes with a range of 5.010–5.020 mm. Their tolerance bands are 12 μm and 10 μm, respectively.
The main challenges include maintaining tight bore tolerances, controlling hole positions and spacing, machining profiles accurately, and verifying the finished components against the engineering drawings.
Locating and mounting holes often determine how components align during assembly. Incorrect spacing or positioning can affect fit and locating accuracy even when the individual hole diameters meet specifications.
Inspection should cover critical bore diameters, specified hole positions and spacing, overall dimensions, profile radii, and applicable surface-roughness requirements. The final inspection scope should follow the customer's drawings and quality requirements.
Yes. The appropriate machining strategy depends on the material's actual hardness and condition, component geometry, and specified tolerances. These factors should be confirmed before the manufacturing process is finalized.
Send your STEP or PDF drawings to Dawang Precision for a free DFM review. Our engineering team can evaluate critical tolerances, machining feasibility, material requirements, and inspection considerations, with a response within 24 hours.
