Stop Your Glass Jewelry From Cracking
Ever had a piece of glass shatter right as you thought you had it? It’s gut-wrenching. It usually happens because the temperature changes too fast, creating a “shock” that the glass just can’t handle. To fix this, we use shortwave IR lamps. They give us a way to move heat instantly and change the power on a dime.
Why Speed Matters
Here’s the thing: you can’t just blast your jewelry with heat and hope for the best. You need a heater that actually listens to you. Shortwave IR lamps are great because they don’t hold onto heat. When your controller tells the voltage to drop, the heat dropsright now. This lets us “ramp” the temperature. We hit the glass with a quick burst to get it to that sweet spot for annealing, then dial it back in milliseconds to keep it steady. If you tried this with old-school resistive heaters, they’d be too slow to react. By the time the heater cooled down, your piece would probably be in a million pieces.
The Gear
We usually go with quartz envelopes for these lamps because they let the IR light pass through without any fuss. As for the connectors—R7s or SK15—that really just comes down to how much space you have and how often you feel like swapping bulbs. We keep the design simple so you can just pop a new one in and get back to work. One tip: keep an eye on your wattage versus your conveyor speed. If you’re working with thick glass, you’ll need that high-wattage punch, but just remember it’s going to pull more from your power supply.
The Trade-off
Now, IR heating isn’t some magic wand. There’s a catch. When you push a lot of power through the lamp to get that lightning-fast response, a lot of heat leaks into the machine’s frame. If you don’t have the right fans and shielding, your housing is going to get way too hot. And once the ambient temperature starts drifting, your precision settings go right out the window. Make sure your vents are clear, or you’ll be fighting the heat instead of controlling it.