Drawing Problems - Chapter 7 Copyright Goodheart-Willcox Co., Inc. 172 AutoCAD and Its Applications—Advanced 10. Mechanical In this problem, you will cut a UNC thread in a cylinder by sweeping a 2D shape around a helix and subtracting it. A. Draw a ∅.25 cylinder that is 1.00 in height. B. Draw the thread cutter profile shown below. The long edge of the cutter should be aligned with the vertical edge of the cylinder. C. Draw a helix centered on the cylinder with base and top radii of .125, a turn height of .050, and a total height of 1.000. D. Sweep the 2D shape along the helix. Then, subtract the resulting solid from the cylinder. Refer to the shaded view. E. If time allows, create another cutter profile to cut a .0313 × 45° chamfer on the end of the thread. Use a circle as a sweep path or revolve the profile about the center of the cylinder. F. Save the drawing as P7-10. Thread Cutter A B Completed Seatback 11. Architectural In this problem, you will add a seatback to the kitchen chair you started modeling in Chapter 2. In Chapter 6, you refined the seat. A. Open P6-9 from Chapter 6. B. Draw an arc for the top of the bow. Using a 14.25″ length of the arc, divide it into seven equal segments. C. Position eight ∅.50 circles at the division points. D. Draw circles at the top of each hole in the seat. E. Create a loft between each lower circle and each upper circle. F. Using the information in the drawings, create the outer bow for the seatback. G. Save the drawing as P7-11.