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Hawk

On 4/15/2020 8:55 AM, wrote:
I am trying drill some holes in glass tile to allow the screws from a GFI receptical cover to seat properly. Purchased a 1/4" ceramic and glass bit and drilled a test hole in an extra tile. All went well.
Left it on the workbench and returned 1/2 hour later to find the corner had cracked off.
What went wrong ? Why would it do that ?
Thanks

I'm gonna take a stab and assume heat with cold. When you drilled the
tile, you created too much heat then placed on a cool bench. The tile
needed to cool slowly to allow contraction. Placing it on the bench
excelled the cooling process to the point of breaking.