You'll want to use a masonry bit and go slow. If they are porcelain or bone china that might require a special bit. Sometimes it's helpful to fill the bottom of the cup with water to cool the bit and the cup.
I have a plastic chair mat under my computer desk that the edges are curled and won't lay flat. Have been unable to bend them back as the plastic is hard
Hi Sonya,
This tutorial is with flower pots, however, I think the principles are the same.
Hope this helps! Lauren - The Little Lake Cottage
Do you have a picture of your tea cups?
You'll want to use a masonry bit and go slow. If they are porcelain or bone china that might require a special bit. Sometimes it's helpful to fill the bottom of the cup with water to cool the bit and the cup.
Use a drill bit for the type of materials like porcelain or china. I think the tile bit would be the best option.
Here is a good video.. https://www.youtube.com/watch?v=O48nKQ8c9CM