it seems that when he goes into the optic mold, that his side walls of his bubble are fairly thin compared to the bottom. when i do it, i also have it like this and yet the neck gets really thin and when i inflate it, the neck gets really thin and eventually collapses on its self. how do i prevent this from happening? can you ask bill if he's there?
Excessive thinning in the upper half of the dipped bubble typically comes from 1) the bubble held down too long before going into the mold 2) allowing the blowpipe to move upward piston-like as one blows while in the mold.
Solution: hold the pipe horizontally until the last possible moment before going into the mold. Then, while blowing hard, "lock" the pipe into position to prevent *any* upward movement. - Bill Gudenrath (glassblower in the video).
(In all optic molding processes, the bubble that goes into the mold should be perfectly even-walled (rather than thick walled) and slightly tapered so as to instantly fit all of the way into the mold.) - Bill Gudenrath
Boobies
okachobee 3 years ago
i love these videos. they're so informative
HawtGlass 3 years ago
thanks bill, thats such great information!
lexivh2 3 years ago
it seems that when he goes into the optic mold, that his side walls of his bubble are fairly thin compared to the bottom. when i do it, i also have it like this and yet the neck gets really thin and when i inflate it, the neck gets really thin and eventually collapses on its self. how do i prevent this from happening? can you ask bill if he's there?
thanks!
NuitSanWoggaWogga 3 years ago
Excessive thinning in the upper half of the dipped bubble typically comes from 1) the bubble held down too long before going into the mold 2) allowing the blowpipe to move upward piston-like as one blows while in the mold.
Solution: hold the pipe horizontally until the last possible moment before going into the mold. Then, while blowing hard, "lock" the pipe into position to prevent *any* upward movement. - Bill Gudenrath (glassblower in the video).
corningmuseumofglass 3 years ago
(In all optic molding processes, the bubble that goes into the mold should be perfectly even-walled (rather than thick walled) and slightly tapered so as to instantly fit all of the way into the mold.) - Bill Gudenrath
corningmuseumofglass 3 years ago
@NuitSanWoggaWogga I would add(though I'm no expert) that he gets the pipe's head right inside the mold preventing "blowout".
Saltyember 8 months ago
nice
contemporaryglass 3 years ago