I am hoping that there is someone here that can tell me more about how to solve the following problem.
I have been drilling holes into my glass pendants (microwave kiln) with my new small rotary tool and diamond bits.
I put it in some water and drill very gently and take a long time to do it right.
It works very well and holes look clean and I think it looks lovely and natural when I finish the piece with cord.
But, even though it looks good at first, after a few days suddenly a big crack appears and the pieces break in two.
So right after drilling everything seems fine and whole, and after a couple of days it suddenly breaks. It has happened to 3 of the 6 pieces I have drilled so far which is a lot.
This dolphin one for example broke without a clear reason (it was just sitting on the table) after 4 days:
Before, there was no crack visible in any way, and it just looked sturdy and whole. I was very happy with it.
I would be so happy if anyone can tell me what it is that I am doing wrong, I just love to use cord instead of a stick on bail. So can I drill holes without having the pieces break? If yes, how can I improve my ways? (a big thank you in advance )