Locating Fits & Shoulder Seating
CNC Turning Prototypes
Custom CNC-turned prototype shafts and sleeves for evaluating locating fits, shoulder positions and assembly seating.
- Process
- CNC turning of a stepped prototype shaft
- Materials
- Grade and condition per shaft drawing
- Quantity
- Prototype quantity for the fit trial
- Inspection
- Pilot diameter, shoulder position and full seating
Product Overview
GPT Precision manufactures CNC-turned prototypes for shafts, sleeves, bushings, pins and other rotational components. Prototype samples can help verify critical fits and assembly geometry before drawings are finalized for repeat manufacturing.
Key Features
- Consider a stepped shaft where a pilot diameter locates a mating component and a shoulder determines its axial position.
- The pilot provides radial location, while the shoulder establishes the seated position.
- Both features influence the finished assembly.
Manufacturing Considerations
- An identified interference should be reviewed against the mating-component design.
- Changes to the shaft radius, bore chamfer or related geometry require approval before a revised prototype is manufactured.
- The accepted revision can then provide the basis for subsequent production planning.
Quality Control & Inspection
- Measure the pilot diameter and shoulder location according to the approved drawing.
- During the specified assembly trial, check whether the mating component reaches full contact with the shoulder.
- If it stops short, examine the relationship between the mating bore entry chamfer and the shaft transition radius.
- Corner interference can prevent full seating even when the pilot diameter meets its specified limits.
Specifications to Confirm
| Pilot fit | Specify the pilot diameter and the mating bore limits. |
|---|---|
| Axial location | Identify the drawing reference for the shoulder position. |
| Corner clearance | Review the shaft transition radius against the mating bore entry chamfer. |
Assembly Considerations
Radial location
Check the pilot against the intended mating bore.
Shoulder seating
Verify full contact and investigate corner interference if the mating part stops short.
Related Products
Request a CNC Turning Prototype Quote
Send the shaft drawing, material specification, quantities and relevant mating-component details. Highlight critical fits, shoulder locations and assembly conditions.
