Page 239 - Making things move_ DIY mechanisms for inventors, hobbyists, and artists

Chapter 7 Bearings, Couplers, Gears, Screws, and Springs 217

FIGURE 7-29 Using the Gear tool in Inkscape

NOTE Remember that the pressure angle and circular pitch must be the
same for the gears to mesh; change only the number of teeth!

6. Use the Circle tool and hold down the CTRL key (on a PC) to draw a circle
inside the big gear. The default circle is filled with black. Zoom in if you need
to. Make sure the arrow selector is active and click the circle. Make sure inches
is selected in the toolbar and the Lock button on the toolbar looks locked.
Type 0.250 in the W box in the toolbar, press ENTER, and watch the H box
change automatically. Your circle will resize to a diameter of 0.250 in, and
your screen should look like Figure 7-30.