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--- projects:glass_sphere:work_logs:work_log_6 [2019/02/22 13:16] – [What I want to accomplish next time] tjhowse
+++ projects:glass_sphere:work_logs:work_log_6 [2019/02/24 06:50] – tjhowse
@@ Line 14: / Line 14: @@
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+Initial results were promising.
-=== Video ===
+{{:projects:glass_sphere:work_logs:pasted:20190224-052205.png}}
-Pending.
+{{:projects:glass_sphere:work_logs:pasted:20190224-052232.png}}
+However during the rough grinding pass one of the slugs fell in half.
+{{:projects:glass_sphere:work_logs:pasted:20190224-052420.png}}
+A gentle tap with a hammer split another in half too.
+{{:projects:glass_sphere:work_logs:pasted:20190224-052502.png}}
+{{:projects:glass_sphere:work_logs:pasted:20190224-052532.png}}
+{{:projects:glass_sphere:work_logs:pasted:20190224-052547.png}}
+I believe there are two problems:
+  * There are veins of impurities running through the glass,
+    * These will create a weak point for a crack to start.
+  * My tempering profile could be improved,
+    * The current profile I'm using was created for tempering float glass. Container glass is slightly different, and so may require a different profile.
+=== Video ===
-{{youtube>AovigLSFNGs?large}}
+{{youtube>PNHmRhPuz8g?large}}
 ====== What I want to accomplish next time ======
   * Read this: http://www.glassblower.info/books/TheGlassTemperingHandbook.pdf,
+  * Read this: https://www.instructables.com/id/Casting-Glass/,
+  * Read this: http://www.glasskulls.com/asending-sequence/,
+  * Adjust my temperature profile accordingly,
+  * Wash my glass in HCl to clean off impurities,
   * Make better slugs.