Yea. What the other guys said.
Sometimes pipe caps have raised crud on the end or even an initial or
something that sticks up. If so, you can flatten any humps off at a
grinding wheel of almost any sort.

Walmart sells "bullet point" drill bits. I don't remember the name on
the tag. These things are great for what you want to do. Still use the
center punch.

Pete Stanaitis

TC wrote:
This may be a dumb question, but is it easy to drill through iron?

I need to drill 2 x 3/16-inch holes through the cast iron cap of a 1-
inch black pipe. I've never drilled through anything tougher than
wood, so I don't know if that's a big deal or not. What kind of drill
bits should I buy? What drill speed should I use? Should I use a
lubricant? How many holes can I make with each bit? (I need a total of
8.) Since the surface isn't flat, do I have to worry about the bit
bending away from my target spot? How long can I expect each hole to
take?

Browsing this group, I've seen mention of laser and EDM. Should I
consider finding a shop which can use one of those techniques for me?

-TC