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Sketches
The first and second brainstorming ideas were quickly ruled out as having too many moving parts to aid in the reduction of energy used for function. the tertiary drawing was the basis of the rake angle idea. With the pinpoint having the least force required and the matching circular profile having the most. The stress concentration angles in the wood as the blade passes through are thought to create the most linear power to distance ratio.
First Attempt: Too many moving parts
![](https://static.wixstatic.com/media/b38cae_da1c569d5af04d3db7a2a5769b154436~mv2_d_1224_1632_s_2.jpg/v1/fill/w_293,h_390,al_c,q_80,usm_0.33_1.00_0.00,enc_auto/b38cae_da1c569d5af04d3db7a2a5769b154436~mv2_d_1224_1632_s_2.jpg)
Second Attempt: Double blade
![](https://static.wixstatic.com/media/b38cae_c06bdee17407460cbcb2491ab198f5da~mv2_d_1224_1632_s_2.jpg/v1/fill/w_295,h_388,al_c,q_80,usm_0.33_1.00_0.00,enc_auto/b38cae_c06bdee17407460cbcb2491ab198f5da~mv2_d_1224_1632_s_2.jpg)
Final Attempt: The median between "low-force high-angle" and "high-force low-angle" can be approximated to be close to the stress lines in the material being cut.
![](https://static.wixstatic.com/media/b38cae_2f7aa8d30fc0484081e9ab55bd306ac8~mv2.jpg/v1/fill/w_98,h_67,al_c,q_80,usm_0.66_1.00_0.01,blur_2,enc_auto/b38cae_2f7aa8d30fc0484081e9ab55bd306ac8~mv2.jpg)
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