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projects:glass_sphere:work_logs:work_log_7 [2019/02/27 02:44] – created tjhowseprojects:glass_sphere:work_logs:work_log_7 [2019/03/19 12:34] tjhowse
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 I strained off the water and soaked the glass again in distilled water. I dried it on a hotplate and measured 130g into four batwashed stainless steel cups. I fired them on a new profile. Step setpoint to 1000°C, wait an hour, step to 560°C, wait ten minutes. I strained off the water and soaked the glass again in distilled water. I dried it on a hotplate and measured 130g into four batwashed stainless steel cups. I fired them on a new profile. Step setpoint to 1000°C, wait an hour, step to 560°C, wait ten minutes.
  
-Insert screenshot of profile.+{{:projects:glass_sphere:work_logs:pasted:20190319-105416.png}}
  
 The slugs came out with a smoother top than any previous attempt, with a clear concave meniscus. The slugs came out with a smoother top than any previous attempt, with a clear concave meniscus.
  
-Photos.+{{:projects:glass_sphere:work_logs:pasted:20190319-105442.png}}
  
-Shine light through slugs.+I also put two slugs from the previous run into the furnace at 560°C for ten minutes to re-temper themI ground the edges round and have begun to flatten the top and they haven't cracked yet, in contrast to the two slugs that were tempered at 510°C which cracked during grinding. 
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 +{{:projects:glass_sphere:work_logs:pasted:20190319-105547.png}}
  
-Grind slugs flat.+{{:projects:glass_sphere:work_logs:pasted:20190319-105559.png}}
  
-I also put two slugs from the previous run into the furnace at 560°C for ten minutes to re-temper them. I ground the edges round and have begun to flatten the top and they haven't cracked yet, in contrast to the two slugs that were tempered at 510°C which cracked during grinding.+Roughing down the flat faces on the linisher went better with the correct temperingUsing a jig and a weight was able to get the slugs to a lappable state much faster.
  
 === Video === === Video ===
  
-Pending +{{youtube>L8Cs_J6q_Do?large}}
- +
-{{youtube>PNHmRhPuz8g?large}}+
  
 ====== What I want to accomplish next time ====== ====== What I want to accomplish next time ======
  
   * Hand grind the slugs smooth   * Hand grind the slugs smooth
projects/glass_sphere/work_logs/work_log_7.txt · Last modified: 2022/01/23 00:24 by tjhowse