Presentation on theme: "An ellipse is an oval shape with no regular radius. It is set up along 2 axes. The “X” axis is always the longest one. X X Y Y The “Y” axis is always the."— Presentation transcript:
An ellipse is an oval shape with no regular radius. It is set up along 2 axes. The “X” axis is always the longest one. X X Y Y The “Y” axis is always the shortest one.
XX Y Y Step 1. Mark out the “X” axis. Step 2. Find the centre of the X axis. Step 3. Mark in the “Y” axis.
XX Y Y Step 4. Set the compass to ½ the “X” axis Step 5. Move the compass to the Y point and mark off the distance along the X axis
XX Y Y Step 6. Place small nails or pins at points F1, F2 and C Step 7. Tie a piece of string, (builders line is best) to the nail at F1. F1 F2 C
XX Y Y Step 8. Take the string around C and to F2 and tie off. Make sure it is stretched reasonably tight. - Too tight and it will pull the nails out - Too loose and the ellipse will be the too big F1 F2 C
XX Y Y Step 9. Insert pencil in place of nail at point C
XX Y Y Step 10. Scribe the arc by keeping the string tight with the pencil and moving it to the left or right. In this example we have gone left.
Now you have created the perfect ellipse. You can use a band saw or jig saw to cut the shape. You can clean up the edges with a disc sander or belt sander and then make a router template for repetitive work.