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Mar 2, 2017 at 23:34 comment added fred_dot_u It's important to note that such skill as described above requires practice and may not be acquired in a single session. I've "played" with such glass activities. The end result was much greater respect for the artisans' skill.
Mar 2, 2017 at 23:32 comment added fred_dot_u That's a very good clarification. I've been lucky enough to watch artisans working glass. In most of the cases, it's somewhat a production activity. As such, the tools are tailored to provide measurement as well as shaping. For example, a truncated cone on the end of a long steel handle is used to open the cylinder to the desired inner diameter and additionally to push into the depth of the cylinder. As an extension, a cylindrical tool would be used to force an outer diameter as well, although it is expected to start with nearly correct wall thickness.
Mar 2, 2017 at 17:26 comment added TheCodeNovice @fred_dot_u Initially i want to make glass tubes, therefore my dimensions of interest would be inner/outer diameter and length. I am asking if a person who is working glass can check these parameters while the glass is still malleable or do I wait until the piece has cooled to check and see if I need to start over. This all revolves around being able to make something out of glass by hand to specified dimensions.
Mar 1, 2017 at 11:02 comment added fred_dot_u One would wonder if the question is associated with the skills of the posting party. Can you make stuff to specific measurements? If one of the measurements is outside diameter, you have to have the ability to measure the outside diameter with an appropriate tool. What dimensions will you need to measure?
Mar 1, 2017 at 2:56 comment added Catija I agree. This question seems to be about obtaining a specific shape, not about whether borosilicate glass can be shaped in general.
Mar 1, 2017 at 2:25 comment added TheCodeNovice I am starting with just a cylinder, but I will need a more complex shapes going forward. You didn't answer my question about working the glass to a specific spec by hand. Thanks.
Mar 1, 2017 at 1:05 history answered fred_dot_u CC BY-SA 3.0