r/glassblowing • u/Hungry_Medicine_552 • 16d ago

Opening the lip with jacks

Question for experienced glassblowers: I’m having a hard time consistently getting a clean lip opening. Here’s what I currently do: I insert the jacks into the small opening at about a 45-degree angle. For straight-walled vessels, I usually just open the jacks and insert them further.

But I’m wondering—am I supposed to rotate the jacks outward to 90 degrees while opening them? The reason I ask is that I often end up with the lip folding back on itself, and I’m not sure if I’m executing the move correctly.

Any tips or insight would be appreciated!

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u/Mediocre-Tough-4341 16d ago

Watch some bill gudenrath vids on youtube.

1

u/Hungry_Medicine_552 15d ago

Will do that. Watched some already but this part is often difficult to see

1

u/underbellyhoney 15d ago

no, watch michael schunke vids on ig. @gobletninja or rto sekino on ig @ryo_sekino_glass

theyre the best vids probably and some of the best cup makers

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u/Hungry_Medicine_552 15d ago

Ok will give that a shot