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--- projects:glass_sphere:work_logs:work_log_5 [2019/01/27 11:20] – tjhowse
+++ projects:glass_sphere:work_logs:work_log_5 [2022/01/23 00:24] (current) – tjhowse
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 {{indexmenu_n>5}}
+[<6>]
 ====== What I want to accomplish ======
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 I crushed them up into chunks no larger than about 40mm in any dimension. I then washed and sieved the glass to remove dirt, dust, and very fine glass powder.
-I dried the wet crushed glass in a stainless steel pot on a hotplate. I weighed out six equal quantities of glass into a muffin pan and melted it in my furnace.
+I dried the wet crushed glass in a pot on a hotplate. I weighed out six 145g quantities of glass into a muffin pan and melted it in my furnace.
 {{:projects:glass_sphere:work_logs:pasted:20190127-112011.png}}
-=== Video ===
+Meets:
+{{:projects:glass_sphere:work_logs:pasted:20190127-113200.png}}
+After I started that profile running I realised I'd forgotten to paint the muffin tin in release agent. This could be bad.
+Results:
+{{:projects:glass_sphere:work_logs:pasted:20190127-233452.png}}
+Looks promising...
+But no. I had to destroy the muffin tin and peel the steel off the glass in strips.
+{{:projects:glass_sphere:work_logs:pasted:20190128-005602.png}}
+{{:projects:glass_sphere:work_logs:pasted:20190128-005613.png}}
+{{:projects:glass_sphere:work_logs:pasted:20190128-005621.png}}
+{{:projects:glass_sphere:work_logs:pasted:20190128-005629.png}}
+I suspect the coating on the muffin tin decomposed at high temperatures and bubbled gas through my slugs. I threw one on the linisher to see whether it would be workable for testing polishing techniques, but the bubbles are very close to the surface and I broke through almost immediately. This results in glass fragments getting caught between the polishing surfaces and gouging around.
+Next time I will try to buy an uncoated stainless steel muffin tin, or I will pre-fire the tin on a dry run to burn off any coatings, then add a layer of release agent.
+=== Video ===
+{{youtube>AovigLSFNGs?large}}
 ====== What I want to accomplish next time ======
-  *
+  * Pre-fire the muffin tin to avoid bubbling.
+====== Bonus pics ======
+The underside of the muffin tin developed this very nice colour:
+{{:projects:glass_sphere:work_logs:pasted:20190128-010038.png}}
+{{:projects:glass_sphere:work_logs:pasted:20190128-010048.png}}
+{{:projects:glass_sphere:work_logs:pasted:20190128-010003.png}}
+[<6>]