Acme Thread – It is a thread having an thread angle of 29degrees. After opening the ISO Draft file, the page settings to be adjusted to A4 size which is most commonly used For this problem, the thread data is as provided in the table. Pitch of the thread is the distance two corresponding points in a thread and here it is considered as 40mm. The thread form repeats after a distance of Pitch. Height of thread or thread depth is 0.5*Pitch+0.25. Bolt(external thread) and nut(internal thread ) have have complimentary profiles. Hence while drawing Acme Thread we shall see crest (raised) for a width of 0.5*Pitch and a trough(cavity or depth) for the width 0.5*Pitch. For drawings https://sites.google.com/site/mechsmvitm/mech-smvitm/course-materials/computer-aided-machine-drawing Drawing a thin horizontal base line (Line thickness is 0.13 as this will be construction line) Draw a line parallel line to the base line to mark the height of the thread using offset command. The distance between the lines is (0.5*Pitch+0.25) (calculated) Offset command: Select the line, enter the distance of offset. The direction of offset is selected by moving the mouse to change the direction of arrow. Vertical lines to represent the 0.5*Pitch distance so that the half thread form can be constructed. These lines are generated using offset command. The inclined line of the Acme thread is drawn at a angle to the horizontal such that the thread angle is 29degrees The inclined angle would be 90-(29/2)=90-14.5=75.5 The calculated dimension 0.3707P (given in the drawing) is rounded for four decimals and is not an exact dimension. The thread form can be constructed from the basic dimensions and thread angles. Repeating the thread form after a distance of Pitch. Completing the one half portion of the thread. Repeating for the second thread after a distance of Pitch. Constructing the second half of the thread form. To keep the angle of thread equal to 29 degree, the inclined line is drawn at -75.5 degree (calculated earlier) to horizontal. Completing the second half of thread form Move the thread form in a distance of 1Pitch using Move+Copy(On) and place it at appropriate points. Produce atleast 3 full thread forms Trimming the excess and unwanted portion of the construction lines. Dimension the thread form.