o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o o
the stroke width. We want to turn this behavior off
for this project, so locate the four Affect icons in the
Tool Controls bar and unselect the one for scaling
the stroke width.
2. Align the cross-hairs and circle both
horizontally and vertically.
3. Select the circle and click on the Edit Paths
tool. Drag the white handles to create an arc as
shown in Figure 10. (If the circle is shown where all
line segments are connected, keep the circle
selected, then click on the Ellipse tool. In the
Change bar that appears, click on the “Switch to arc
(unclosed shape)” icon.
4. Show the Fill and Stroke panel, and select
white as the fill color. Click on the Stroke style tab,
specify a stroke width of 0.5 px, and set the style to
one of the dotted lines (Figure 11). This is just for
looks, so pick one you like best.
the wires, as well as the screw driver to tighten and loosen
Laying Out Holes for
Many projects include one or more pots for making
finely tuned adjustments or calibration. Potentiometers
have both a mounting hole and an optional (but
recommended) outer graduation. The Interocitor uses
Note! A sometimes irritating “feature” of
Inkscape is its penchant for remembering the last tool
setting you used. This often comes in handy, but it can also
be a source of frustration. Once you change the behavior
of some tools — like the arc setting for the Eclipse tool — it
stays until you change it again.
If you find all the new circles come out as arcs, simply
revert back to the original setting by clicking on the Ellipse
tool and click on the “Make the shape a whole ellipse”
icon in the New bar that appears.
1. Use a circle and cross-hairs like you made above,
then ungroup them so you can work with them separately.
Enlarge the circle to 1” in diameter — this will work with
dials up to about 3/4” of an inch.
Note! When resizing objects, Inkscape may also scale
Most panels have explanatory text added here and
there, even for control functionality that is obvious.
Inkscape lets you add text anywhere, in any size and font
you have installed on your system. For the Interocitor
example, I’ve used standard Arial — one of the standard
Figure 10. Create a potentiometer
dial face by creating a circle with
the Ellipse tool, then dragging by the
white handles to produce an arc.
Figure 11. Use the Stroke
style features of Inkscape to
add a bit of flair to the
potentiometer dial face.