01 / THE BUYING QUESTION
Which pin features control insertion and location, and which dimensions simply provide clearance?
02 / READ THE GEOMETRY
Details that shape
the requirement.
Locating sections
Separate the diameters that locate the pin from sections that only pass through a clearance hole. Identify each mating component and its relevant drawing revision.
Shoulder positions
Identify the shoulder that stops insertion, then dimension the other functional sections from that reference. Include the assembled projection rather than relying only on overall length.
Entry and handling edges
Show the required entry shape and the edges that must remain sharp or receive a break. Include handling constraints for the slender sections during packing and assembly.
FROM GEOMETRY TO THE WORKSHOP
See the manufacturing context.
Explore a Chengshuo workshop scene alongside the features in this product study. This is general process footage, not footage of the reference part or its inspection results.
Machining and a dimensional check
Machining close-ups followed by a dial-caliper check.
Which diameters, shoulders and thread features control your assembly?
Shafts, pins & mating fitsReview my part with this process ONE PART. THREE BUYING DECISIONS.
What matters
to your team?
Define the functional interfaces.
State the desired locating function before selecting a fit. Identify whether the mating part is also changing during the development cycle.
Discuss your engineering requirementsMake the quotation comparable.
Separate sample evaluation quantities from forecast demand. Confirm whether finishing, reports and protective packing are included in each quotation.
Discuss your purchasing requirementsAgree the acceptance evidence.
Align the measuring references with the assembly references. A length reading from the wrong shoulder can answer a different question.
Discuss your quality requirements03 / A PART-SPECIFIC REVIEW
From feature
to machining brief.
01Map the assembly sequence
Provide a section or marked assembly view showing insertion direction, support points and final seating. Explain whether the pin is retained by fit, another component or a separate operation.
02Define the finished pin
Specify brass grade, material condition and any finish required. Review the critical diameters and shoulder relationships in the condition in which the receiving team will measure the part.
03Agree a focused sample review
Choose the features for the dimensional report and any trial assembly using a nominated mating part. Record the trial conditions and acceptance decision separately from the dimensional readings.
04 / BEFORE SAMPLE APPROVAL
Agree what
acceptance will show.
Measure the nominated locating diameters and shoulder positions from the agreed reference.- Check entry edges and contact surfaces for the specified burr and damage limits.
- Record drawing revision, sample identification and any agreed assembly-check conditions.
INSPECTION PLANNING WORKSHEET
Make insertion, seating and handling part of approval.
A small pin needs a clear stopping reference and edge condition. Define the mechanical checks alongside any required mating-part trial.
Planning worksheet · not a measured report01Locating sections
What to define
Mark the diameters that locate the pin and separate clearance sections.
Record to agree
Characteristic IDs and dimensional readings for the nominated sections.
02Stopping shoulder
What to define
Define the seating face, insertion depth and relevant shoulder distances.
Record to agree
Readings from the agreed reference with the sample identification.
03Entry edges
What to define
State the required entry form, burr acceptance and protected surfaces.
Record to agree
The agreed visual or dimensional check and its viewing conditions.
04Assembly trial
What to define
Identify the mating part, revision and trial conditions if a trial is needed.
Record to agree
A separate assembly observation and approval decision.
CARRY APPROVAL INTO THE ORDER
- 01
Protect slender features
Agree support, separation and protection of contact surfaces in transit.
- 02
Separate sample and lot
Connect each sample or production lot to its material and drawing revision.
- 03
Carry approval forward
Keep agreed insertion, edge and packing requirements in the next release.
Measurement methods, acceptance limits and included records are agreed against your drawing before sampling.
Product reference & scope
This case uses a photographed Chengshuo component to explain the drawing, purchasing and inspection decisions for a similar part. Project specifications and acceptance are agreed during review.
Original Chengshuo product reference
