Critical Path update

Looking at the critical path outlined in the last post, I’ve completed the first step, validating the relaxing shoe concept, and begun the next step, scaling the lasts and patterns.

The most recent prototype made on Last 8 felt excellent during climb testing last week and passed the majority of tests I use to assess a prototype design, so I committed to grading Last 8 to Dan’s size. Using scale factors derived from the slope of best fit lines from Army foot data (example graph below) and from Dan’s foot measurements, I scaled up the CAD file, lasercut the new parts, and assembled Dan’s last.

Data from: Kenneth R. Parham; Claire C. Gordon, and Carolyn K. Bensel (1992). Anthropometry of the Foot and Lower Leg of U.S. Army Soldiers:  Fort Jackson, South Carolina -- 1985.  NATICK/TR-92/028.  Natick, Ma: U.S. Army Natick Research, Development, and Engineering Center. (ADA261405) and: Kenneth R. Parham; Claire C. Gordon, and Carolyn K. Bensel (1994). Anthropometry of the Foot and Lower Leg of U.S. Army Soldiers:  Fort Jackson, South Carolina -- 1985.  Electronic database.  Natick, Ma: U.S. Army Natick Research, Development, and Engineering Center. (ADM000468)

Data from: Kenneth R. Parham; Claire C. Gordon, and Carolyn K. Bensel (1992). Anthropometry of the Foot and Lower Leg of U.S. Army Soldiers: Fort Jackson, South Carolina — 1985. NATICK/TR-92/028. Natick, Ma: U.S. Army Natick Research, Development, and Engineering Center. (ADA261405)
and:
Kenneth R. Parham; Claire C. Gordon, and Carolyn K. Bensel (1994). Anthropometry of the Foot and Lower Leg of U.S. Army Soldiers: Fort Jackson, South Carolina — 1985. Electronic database. Natick, Ma: U.S. Army Natick Research, Development, and Engineering Center. (ADM000468)

Now, I’m assessing methods for efficiently creating the graded patterns in 3D CAD and flattening them accurately.

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2 thoughts on “Critical Path update

  1. pretty cool. I’d like to hear too how well the graded last for Dan’s foot measurements worked once the scaled up prototype is built.

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