Understanding Tolerance in Investment Casting

Tolerance Casting design reference data

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1. Tolerance (mm)

Casting Basic Size (mm)≤1010~2525~5050~7575~100100~150150~200200~250>250
General Tolerance(mm)±0.15±0.25±0.35±0.50±0.65±1.00±1.50±1.80±1.00%
Special Tolerance (mm)±0.10±0.15±0.25±0.40±0.50±0.75±1.00±1.20±0.60%

2. Flatness, straightness, roundness

Casting Basic Size (mm)0~2525~5050~100100~150
Tolerance (mm)0.20.40.60.8

3.  Ra/μm

Ra6.3~3.2

4.The ultimate tolerance of the slot can be cast

 Items (φmm) Diameter (φmm) L / D
φ2~φ3L / D ≤ 1
φ4~φ7L / D≤ 2
≥φ8L / D ≤ 2.5
φ2~φ3L / D ≤ 2
φ4~φ7L / D≤ 4
≥φ8L / D ≤ 5

5. Size   and Weight Range

ItemsMaxMinBest
Profile (mm)1000×300×30020×10×10<150×100×100
 Weight(Kg)400.0150.2~5
Thickness(mm)1.05~15

6. Structure Proposal


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