This is a 2-point multiple-choice question for the CAD credentialing exam Ask a CAD expert how to draw this comb Thank you~~

Look at the picture is not the picture you want, drawing method is as follows:

1. Draw R120 circle, and draw the chord height of 4 (D size) of the chord.

2. Draw the concentric circles R141 (R120+C dimensions) of the R120 circle.

3. Draw auxiliary lines perpendicular to point A, offset 10mm, and then arrayed at a spacing of 3mm, shear after the completion of the comb teeth.

4. Draw and AB into a 100-degree angle line, offset AB line 21 (E size), the 2 intersect at C.

5. C as the center of the circle to draw the circle of R16, C as the endpoint of the perpendicular line drawn AC, intersecting in the circle that is, the center of the circle of the R16 in the figure.

6. Offset AB46mm (B size), make a circle (note that the drawing method selected tangent, tangent, radius), respectively, in the offset line and R16 circle tangent. C point as the end point to make the auxiliary line perpendicular to AB, offset this line 103mm (A size) intersection of the circle at point D, cut to get R16, R150 arc.

7. B, D as the endpoints of the arc (drawing method to select the starting point, endpoints, radius), you can get R100 arc.

8. Draw φ6 circle, this is good, I will not say.

So your diagram is complete, I hope it is what you want.