This calculator scales a selected diametral-clearance rate with journal diameter, adds that clearance to obtain the selected bearing bore, and compares measured ovality with a disclosed 0.0005D reference. It does not specify a bearing fit for service.
Solid Strap End · Selected Diametral-Clearance Ledger
Explore selected diametral-clearance scaling and an explicit ovality comparison without treating either as a universal bearing specification.
Equation Used
- Clearance input and output are diametral.
- The selected clearance rate scales linearly with journal diameter.
- The bore result is nominal journal diameter plus selected diametral clearance.
- The 0.0005D ovality value is a comparison reference only.
- Load, speed, viscosity, temperature, material, lubrication and safety are excluded.
The 0.0005D ovality value is retained only as a disclosed comparison reference, not a universal service limit.
Selected clearance reference
The drawing shows a continuous-eye strap end with normalized, deliberately enlarged clearance and ovality graphics. The dimension bars carry the exact selected values.
What the calculator determines
Select journal diameter, diametral clearance per 25 mm and measured bore ovality. The calculator reports the scaled diametral clearance, corresponding bore, and difference from the selected 0.0005D comparison reference.
Selected dimensional ledger
Cdiam=D(c25/25); B=D+Cdiam; Oref=0.0005D; margin=Oref−O.
Selected-input example
For D=100 mm and c25=0.025 mm per 25 mm, selected diametral clearance is 0.100 mm and selected bearing bore is 100.100 mm. O=0.050 mm equals the disclosed 0.0005D reference.
Dimensional ledger, not fit specification
Required clearance and form tolerances depend on bearing type, material, load, speed, viscosity, temperature, lubrication method, manufacturing process and maker data. The 0.0005D value is a comparison reference, not a universal rejection limit.
Questions
Is clearance radial or diametral?
This ledger explicitly treats the selected rate and output as diametral clearance: bearing bore minus journal diameter.
Does a negative margin condemn the bearing?
No. It only means measured ovality exceeds the disclosed 0.0005D comparison reference.
References & Further Reading
- Wikipedia contributors. Connecting rod. Wikipedia
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