Making a Fraction Calculator

The video begins with the host introducing a DIY project to create a fraction calculator, inspired by a similar tool that garnered attention in a previous episode. The original calculator is no longer available, prompting the host to design and build their own version. The project involves creating two circles, each divided into 64 equal sections, to represent fractions. The host suggests using a spoke generator program for precise division and marking the sections incrementally. A mistake in the host's own markings is acknowledged, demonstrating the editable nature of the project. The top circle is slightly larger, with extended lines from the bottom circle's sections to mark points for drilling holes. The zero mark is emphasized with a dark color for clarity.

The host proceeds to explain the construction of the top wheel of the fraction calculator, which involves marking 64 sections and incrementing values by 1/64th for each section, starting from a chosen starting point. A handle or thumb hole is designed for ease of use, and a cut-out section is planned for the zero mark to serve as a stop during calculations. The host then transitions to material preparation, selecting hardboard for the project. Patterns are adhered to the hardboard using spray adhesive, and the host demonstrates the process of cutting the shapes using a scroll saw, emphasizing the importance of a clean cut for accuracy.

The video continues with the drilling of 3/32nd diameter holes at the marked points on the larger wheel, using a brad point bit for clean cuts. The host advises caution during this step to avoid damaging the pattern. The top wheel is then aligned with the larger wheel, ensuring the perimeters match, and a 5/32nd hole is drilled through both layers to accommodate a drive pin rivet. The rivet is used to fasten the two discs together, allowing the top wheel to spin freely, completing the assembly of the fraction calculator.

The host demonstrates how to use the completed fraction calculator, starting with resetting it to zero using the marked dark spot. The calculator is used to add fractions by aligning the desired fraction holes and spinning the top wheel until it hits the stop. The process is shown for adding and subtracting fractions, with the host explaining how to read the results in the answer window. The video also addresses potential modifications, such as adding decimal equivalents to the fractions for additional utility.

In the final segment, the host expresses gratitude for the viewers' engagement and interest in the fraction calculator project. They encourage viewers to reach out via email to obtain the detailed pattern for the calculator, offering it as a token of appreciation for the viewers' support. The host also highlights the potential for personal modifications to the design and reiterates the simplicity and utility of the fraction calculator for woodworking and other applications involving imperial measurements.