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Isometric Construction of the Bike Frame - page 5
The rear/bottom ends of these fork parts are 60 percent of the diameter of the top edge. With snap to objects turned on draw a line from the bottom to the top of the rear edge of each fork. Use the Property Bar to apply a 60 percent horizontal and vertical stretch to each line. Use the Node Edit Tool to move the fork edges in as shown.
Make sure the vertical segments are straight lines. Convert the back ends to curves and smooth them. Delete everything except the two forks. Fill the completed forks with white and position over the heel. Complete this step by correcting the front to back order by sending the left (back) fork to the back.
Copy the Seat Tube to the drawing layer. Snap a line across the top of the Seat Tube. If you watched the status line you should have come up with something like 1.088 inches. To correct for the isometric/major axis discrepancy stretch this line by 120 percent using the Transform Docker. Convert the Seat Tube Rectangle to a curve (Ctrl+Q). Use the Node Edit Tool to move the outside left top and bottom nodes out to the left end of the line. Repeat for the right.

 

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1997 - 2001 John M. Morris