Profile of Metric Thread (Internal Thread)
This post explains the simple steps to draw the standard profile of metric internal thread.
Let us draw, the standard profile of metric external thread to the scale 1:1 whose pitch is 40 mm.
Provide other dimensions as per standards.
First, draw a number of vertical lines for a distance of P/2. i.e. 20 mm.
The distance of major diameter D is calculated by 0.866*P.
That is D = 0.866*40 = 34.64 mm.
Draw the two horizontal thick line separated by distance D.
Draw a thin line at an offset distance of D/8 from a top thick line.
That is D/8 = 34.64/8 =4.33 mm
Draw another thin line at offset distance D/4 from the bottom line.
That is D/6 = 34.64/4 = 8.635 mm.
With respect to thick lines, draw a triangle by joining the intersection point as displayed on the screen.
The angle made between the flanks should be 60°.
With respect to a triangle, draw an arc at the root with any suitable method.
The crest is made flat.
Hatch the portion as displayed on the screen.
Complete the profile with the required dimensions.
This post explains the simple steps to draw the standard profile of metric internal thread.
Let us draw, the standard profile of metric external thread to the scale 1:1 whose pitch is 40 mm.
Provide other dimensions as per standards.
First, draw a number of vertical lines for a distance of P/2. i.e. 20 mm.
The distance of major diameter D is calculated by 0.866*P.
That is D = 0.866*40 = 34.64 mm.
Draw the two horizontal thick line separated by distance D.
Draw a thin line at an offset distance of D/8 from a top thick line.
That is D/8 = 34.64/8 =4.33 mm
Draw another thin line at offset distance D/4 from the bottom line.
That is D/6 = 34.64/4 = 8.635 mm.
With respect to thick lines, draw a triangle by joining the intersection point as displayed on the screen.
The angle made between the flanks should be 60°.
With respect to a triangle, draw an arc at the root with any suitable method.
The crest is made flat.
Hatch the portion as displayed on the screen.
Complete the profile with the required dimensions.
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