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drilling cast iron

H

Heyseed

Member
Seeing the threads about welding and brazing the stuff I have a question about drilling it.
I picked up a used woodstove that has a top load option, the handle for the top plate is broken off and I want to just drill a 3/16 hole and add a knob to it. Other than a quality (sharp) bit what should I watch for. Fast? slow? I don't want to crack the lid. it is only about a quarter inch thick there.
a174341.jpg
 
Slow and EASY. Use a good drill press and set it to the lowest speed you can. ALSO a brand new bit cause they are cheep enough. Last thing is use straight Anti-freeze, several drops at a time. Cools, lubes, and cleans up with water. Try it, you will be amazed!
 
Drilling or machining cast iron no oil or coolant causes chips to stick to tooling and break or dull it.
Ypop
 
I've drilled hundreds of porcelain enameled cast iron sinks. I used a carbide tipped masonry bit to get through the porcelain then a good quality drill dit to go through the cast. Drill it dry & slow as if you get it too hot you'll ruin the bit.
 
It depends on the type of iron, some kinds are virtually impossible to machine. Most likely though the stove is made of a softer iron and will drill easily with a regular bit. Technically you would want to modify the lip for zero rake but for one 3/16 hole just use as is and drill slower and with firm pressure.
 
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