Cut through the enamel ware coating with a tile drill bit. Use moderate pressure until the enamel has been cut away to expose the underlying metal.
Remove the tile bit and replace it in the drill chuck with a metal cutting drill bit.
Position the metal bit at the exact point where the enamel ware has been cut through, and drill through the metal base that has been exposed. Once through the metal, stop drilling when the other side of the enamel ware has been reached..
Remove the metal drill bit, replace it with the tile drill, and finish cutting the hole out through the enamel with the tile drill bit.
Hi CeCe, here's some info that should help you.....
Hi CeCe: Here's a site that tells about that. But, they don't say anything about putting a piece of tape on the area you want to drill into. Tape will keep your bit from slipping around and keep the enamel from chipping.
This site is very good on it's directions. It seems a bit ponderous, but you don't want to make a mistake:
You will need a special bit for metal
Here is info on how to do this
We recently drilled through a metal pan to make a bird feeder. He used a punch to gently mark the spot first and then used a special drill bit and none of the paint chipped off. https://www.exquisitelyunremarkable.com/2020/07/bundt-pan-bird-feeder.html
Use a drill bit made for ceramic and glass
and then do it carefully in the sink with water
on it to keep it cool
You can get a ceramic drill bit
Tile bits are good, or you can try a ceramic bit. I've had good luck with abrasive conical ceramic bits for my Dremel tool on a fast speed with minimal pressure. I do a shallow pre-drill with the conical bit so that it just breaks the surface on the opposite side. Then switch to a straight metal bit to finish boring out the full 1/8" diameter. This should minimize chipping on the top surface, but may still chip a bit on the under side of the lid as you break through while widening.
A ceramic drill bit
You can get a masonry drill bit
Use a drill bit like this one: https://amzn.to/3e0vdAZ