Formula for calculating the middle diameter of the thread, and calculating the small diameter of the

International standards. 1. Calculation formula for the inner aperture of the extrusion wire tapping: formula:

Tooth Outer Diameter 1 2 Pitch Example 1: Formula: M3 Example 2:

Formula: m3 Second, the conversion formula of general imperial silk tapping: 1 inch = **) Example 1:

1 4-30)1 4 tooth diameter) tooth distance) then 1 4-30 converted to metric teeth should be: Example 2: (3 16-32) 3 16 tooth diameter) tooth distance) then 3 16-32 converted to metric teeth should be:

3. The general formula for converting inch teeth to metric teeth: numerator denominator tooth outer diameter (same as above) example 1: (3 8-24) 3 8 tooth outer diameter) metric tooth distance) then 3 8-24 converted to metric tooth should be:

4. Formula for converting American teeth to metric teeth: for example: 6-326-32 (** 6 tooth outer diameter) tooth spacing) then 6-32 to metric teeth should be:

The formula for calculating the inner diameter of the hole: the outer diameter of the tooth 1 2 and the tooth distance should be: then the 6-32 inner diameter should be the algorithm of extrusion wire tapping inner hole

Simple formula for calculating the lower hole diameter 1: tooth outer diameter (tooth distance ** lower hole diameter example 1: m6 maximum lower hole diameter) m6 (minimum) example 2:

The simple calculation formula for the inner diameter of the cutting wire tapping hole: m6 (maximum) m6 (minimum) m6 (tooth distance ** lower hole diameter example 3: m6 Fifth, the calculation of the outer diameter of the tooth is simple.

The middle diameter d2 is the diameter of the imaginary cylindrical surface at the same width of the groove and protrusion in the internal tooth profile of the cross-section through the thread, approximating the average diameter of the thread, d2

d+d1）/2。The middle diameter is the diameter that determines the geometrical parameters of the thread and the properties of the fit.

The maximum diameter of the large-diameter d thread, i.e. the diameter of the imaginary cylindrical surface that coincides with the thread crown, is defined as the nominal diameter in the standard.

The minimum diameter of the thread with diameter d1, i.e. the diameter of the imaginary cylinder that coincides with the bottom of the thread, is often used as the calculated diameter of the dangerous cross-section of the screw in the strength calculation.

The formula for calculating the middle diameter of the thread is as follows:

1. If you want to calculate the middle diameter of the thread, you need to calculate it according to the formula d2=d-p; where d refers to the large diameter of the thread, and p refers to the pitch, as for the specific coefficient value of the thread, generally only need to look at the special coefficient value formula table to know.

2. There are many types of threads on the market, and the thread size will be different if the thread type is different. If it is classified according to the thread size, the thread can also be divided into thread diameter, thread medium diameter, thread large diameter, etc., and these thread calculation formulas are also different.

Screw anti-slip tips

1. Cushion method

When the screw is slippery, you can put some non-woven fabric, double-sided tape and other items into the screwdriver bit, which can enhance the friction at the screwdriver bit, so that the screw can be easily unscrewed.

2. Glue method

When the screw is slippery, you can also inject some 502 glue into the screw hole, and when the glue is completely solidified, then use needle-nose pliers to try to loosen the screw. When twisting the screw, you must not use a screwdriver to twist it, otherwise it is easy to cause the screw to slip again.

3. Firing method

When the screw is slippery, you can also put the head of the screwdriver on the fire to burn, when the head position is burned red, then quickly put the head of the screwdriver on the screw hole, wait for about five seconds, and then try to unscrew the screw.

The large diameter of the thread is subtracted by 2 times the tooth height plus one-tenth of the tooth height (because the top of the ordinary triangular thread is turned off by one-eighth of the tooth height, so the bilateral size is added by a quarter of the tooth height).

Definition of the diameter of the internal threadThe diameter of the thread is defined by the formula with respect to the diameter of the thread d, the value of the diameter on the inner thread closest to the axis. The formula for calculating the internal thread can be calculated according to the geometry of the following thread diagram, where the diameter value of d1 and p is the pitch.

h is the height of the tooth profile. Trail value = nominal diameter.

Pitch. <>

Maximum diameter = nominal diameter pitch + basic deviation.

Minimum diameter = nominal diameter pitch + basic deviation + middle diameter tolerance.

d1=d-2*5 8h= p is the pitch.

Simple enough to sprinkle!