Differences

This shows you the differences between two versions of the page.

--- projects:glass_sphere:work_logs:work_log_6 [2019/02/20 12:36] – created tjhowse
+++ projects:glass_sphere:work_logs:work_log_6 [2019/02/24 05:36] – tjhowse
@@ Line 14: / Line 14: @@
 {{:projects:glass_sphere:work_logs:pasted:20190220-123604.png}}
+Initial results were promising.
+{{:projects:glass_sphere:work_logs:pasted:20190224-052205.png}}
+{{: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 ===
@@ Line 23: / Line 47: @@
 ====== What I want to accomplish next time ======
-  * Polish the slugs.
+  * Read this: http://www.glassblower.info/books/TheGlassTemperingHandbook.pdf,
+  * Adjust my temperature profile accordingly,
+  * Wash my glass in HCl to clean off impurities,
+  * Make better slugs.