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An old timer told me my punty was too hot and it clicked | Glassblowers - Vivisector

An old timer told me my punty was too hot and it clicked

I was at a small glass meet in Asheville about six months ago, working on a simple vase. I kept having trouble getting a clean break from my punty rod. This guy who runs a studio there, Frank, watched for a minute and just said, 'Your punty is glowing. You're trying to weld with a hot nail.' He meant I was heating the punty tip way too hot, so it was too soft and would just stretch and leave a big scar. I always thought hotter was better for the seal. I started letting the punty cool to a dull orange, almost black heat, before touching it to the piece. The difference was instant. The break is cleaner now and I lose way less work to punty marks. Has anyone else had a basic heat control tip that fixed a big headache for them?

4 comments

4 Comments

the_claire6mo ago

Man, I always figured a hotter punty made a stronger seal too. It just makes sense in your head, right? Frank's advice about the hot nail is such a perfect way to put it. Letting that punty cool down a bit was a total game changer for my finishing work.

owens.blair6mo ago

Honestly that line about it "making sense in your head" is so true, @the_claire. I read this old forum post from a lampworker who said treating the punty like a hot nail is the only way. He talked about how a red hot punty just shocks the piece and makes a weak, stressed seal that pops off. Letting it cool to a dull orange gives it some grip, like the glass can actually stick to it without cracking. Tbh it fixed my problem with vase bases cracking off right at the punty mark.

henryt186mo ago

Totally changed my finishing work too.

beth_park4mo ago

Wait, wait, wait - did you say "dull orange"? I just about dropped my pipe when I read that. I've been working with a cherry red punty this whole time, and I've been getting so frustrated with pieces popping off, I thought it was just my bad luck or something. I mean, I knew Frank was onto something with the hot nail tip, but I didn't realize it was that much of a difference in temperature. 'Hot but not glowing' really meant 'barely glowing at all', huh? That explains why my last few attempts at a heavy paperweight kept cracking, I was practically welding the thing instead of sticking it on.