TactiPad

The small triangle tool is intended for your own drawing templates out of cardboard or other sturdy material. The sides of the triangle have specific lengths. If you place one of them against the edge of the circle in the CircleFrame, they exactly span an arc of 45, 60 or 90 degrees. By rotating the triangle respectively 8, 6 or 4 times along the circle’s edge, it will end up in the starting position again. When you give the side of your template one of these lengths, it will fit a number of times in the full 360 degrees of the CircleFrame too.

Cutting out a shape from the center of your templates and using this as an outline allows for infinite variation in shapes and patterns. Recurrence and/or partial overlap will give your drawing even more appeal. When placed against the circle, the degree indications can be used to determine the amount of rotation and overlap of the patterns.

Figure 1. The small triangle tool is placed along the edge of the large circle.

The CircleFrame comes with a set of three drawing tools that help the user to get the best circular drawings. These tools are the zigzag triangle, small triangle and wedge tool.

Figure 1. The small marked holes can be used to fix the drawing tools with pins.

The CircleFrame is one of the smart accessories for the TactiPad. Besides regular freehand drawings, the CircleFrame enables you to make drawings in which circles have the main focus.
Draw beautiful repeating patterns, pie charts, clocks with hour and minute hands or mathematical functions with ease. You can use the **zigzag triangle, the **small triangle or **wedge tool as one of the three tools to create your objects in the circle of the Circle Frame.

Figure 1. CircleFrame positioned on the buttons of the TactiPad.

Details of the CircleFrame

In the middle of the CircleFrame is a large circle with a diameter of 20 centimeters. This is the actual drawing area for your drawings. Along the edge of this circle you find clear tactile markings every five degrees which form a large protractor. When using the drawing tools, they can be aligned with the edge of this circle.
Around the outside of the circle there are extra markings: a teardrop shape for every 30 degrees, a line for every 45 degrees, or a combination of both where they coincide at 0, 90, 180 and 270 degrees.
In the outer edge of the CircleFrame, notches are made which​​, seen from the center of the circle, lie on the same line as the degree markings along the inner edge of the circle.
Because the circle is exactly in the middle of the circle frame, the frame is horizontally and vertically symmetrical. Therefore, there is no difference in shape between the yellow and black side. The orientation of the CircleFrame on the TactiPad therefore needs no consideration.
Slots in the outer part of the CircleFrame fit over the eight adjustable buttons on the TactiPad. Place these buttons five centimeters from the corners of the drawing surface. The CircleFrame can then be placed in three different positions: in the middle of the drawing board with the edges coinciding with those of the TactiPad, or in two positions left and right of the center.

Figure 2. Indications run along the edge of the circle: small indents for every 5 degrees, drop-shaped ones every 30 degrees.