{"version":"https://jsonfeed.org/version/1","title":"The Sheet Metal Sage","home_page_url":"https://sheetmetalsage.com","description":"The Sheet Metal Sage","author":{"name":"The Sheet Metal Sage"},"items":[{"id":"https://sheetmetalsage.com/notes-from-the-sage/f/the-rolling-problem-what-the-heck-is-a-polycrystal","html_content":"<img src=\"https://img1.wsimg.com/isteam/ip/6c1ff985-407f-4464-87c2-339b72b2dd50/sheet_metal_rolling.jpg\"/><p>Sheet Metal is a Smashed Crystal, or Polycrystal, and Yes It Matters</p>","url":"https://sheetmetalsage.com/notes-from-the-sage/f/the-rolling-problem-what-the-heck-is-a-polycrystal","title":"The Rolling Problem: What the Heck is a Polycrystal?","summary":"Sheet Metal is a Smashed Crystal, or Polycrystal, and Yes It Matters","date_modified":"2026-10-01T18:00:00Z"}]}