1. Calculation formula for inner hole diameter of thread extrusion tapping:
Formula: tooth outer diameter - 1/2 × tooth pitch
Example 1: Formula: M3×0.5＝3-(1/2×0.5)＝2.75mm
M6×1.0＝6－(1/2×1.0)＝5.5mm
Example 2: Formula: M3×0.5＝3-(0.5÷2)＝2.75mm
M6×1.0＝6－(1.0÷2)＝5.5mm
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2. Conversion formula for general British wire tapping:
1 inch = 25.4mm (code)
Example 1: (1/4-30)
1/4×25.4＝6.35(tooth diameter)
25.4÷30＝0.846 (tooth distance)
Then 1/4-30 converted into metric teeth should be: M6.35×0.846
Example 2: (3/16-32)
3/16×25.4＝4.76 (tooth diameter)
25.4÷32＝0.79 (tooth distance)
Then 3/16-32 converted into metric teeth should be: M4.76×0.79
3. The general formula for converting British teeth into metric teeth:
Numerator ÷ denominator × 25.4 = tooth outer diameter (same as above)
Example 1: (3/8-24)
3÷8×25.4＝9.525(tooth outer diameter)
25.4÷24＝1.058 (metric pitch)
Then 3/8-24 converted into metric teeth should be: M9.525×1.058
4. The formula for converting American teeth to metric teeth:
Example: 6-32
6-32 (0.06+0.013)/code×6＝0.138
0.138×25.4＝3.505 (outer diameter of tooth)
25.4÷32＝0.635 (tooth distance)
Then 6-32 converted into metric teeth should be: M3.505×0.635
1. Calculation formula of hole inner diameter:
The outer diameter of the tooth - 1/2 × the tooth pitch should be:
M3.505－1/2×0.635＝3.19
Then the inner diameter of 6-32 should be 3.19
2. Extrusion wire tapping inner hole algorithm:
Simple calculation formula of lower hole diameter 1:
Tooth outer diameter - (tooth pitch × 0.4250.475)/code = lower hole diameter
Example 1: M6×1.0
M6-(1.0×0.425)=5.575 (maximum lower aperture)
M6-(1.0×0.475)=5.525(minimum)
Example 2: Simple calculation formula for the inner diameter of the hole tapped by the cutting wire:
M6－(1.0×0.85)=5.15 (maximum)
M6－(1.0×0.95)＝5.05(minimum)
M6－(Tooth pitch×0.860.96)/code=lower aperture
Example 3: M6×1.0＝6-1.0＝5.0+0.05＝5.05
5. Simple formula for calculating the outer diameter of the press teeth:
1. Diameter - 0.01 × 0.645 × pitch (need to pass and stop)
Example 1: M3×0.5＝3-0.01×0.645×0.5＝2.58 (outer diameter)
Example 2: M6×1.0＝6-0.1×0.645×1.0＝5.25 (outer diameter)
6. Calculation formula for metric tooth rolling diameter: (Full tooth calculation)
Example 1: M3×0.5＝3-0.6495×0.5＝2.68 (outer diameter before turning)
Example 2: M6×1.0＝6-0.6495×1.0＝5.35 (outer diameter before turning)
7. Embossed outer diameter depth (outer diameter)
Outer diameter÷25.4×Tooth pitch=Outer diameter before embossing
Example: 4.1÷25.4×0.8 (flower pitch)=0.13 The embossing depth should be 0.13
8. Diagonal conversion formula for polygonal materials:
1. Square: diagonal diameter × 1.414 = diagonal diameter
2. Pentagon: Diagonal diameter × 1.2361 = Diagonal diameter
3. Hexagon: Diameter of opposite sides × 1.1547 = Diameter of opposite corners
Formula 2: 1. Four corners: diagonal diameter ÷ 0.71 = diagonal diameter
2. Hexagon: diagonal diameter ÷ 0.866 = diagonal diameter
9. Tool thickness (cutting knife):
Material outer diameter÷10+0.7 reference value
10. Calculation formula of taper:
Formula 1: (Large head diameter - Small head diameter) ÷ (2 × total length of taper) = Degrees
Is equal to finding the trigonometric function value
Formula 2: Simple
(Big head diameter - Small head diameter) ÷ 28.7 ÷ Total length = Degrees
Post time: Feb-22-2024
