steel drill bits 24mm and larger have a seized post

[559er]

Already bought a 22mm for steel and looking for others,used OK,must be for use with steel,otherwise a reamer could help it's an alloy post and I'm using a standard drill with adapter for larger drill bits

 

[NakedGav]

When I did the same to my Kona, basically milling the seatpost downwards VERY carefully, I used holesaws from here
You'll need the suitable arbor as well.

 

[juz]

Be careful with a drill, they don't like drilling half a hole and can grab. As mentioned a reamer, end mill or hole saw would be better.

 

[559er]

Damn them holesaws are expensive i think i'll stick to collecting drill bits,sometimes the best bet is to drill out to 22mm then use a bmx post,using caustic soda will take a very long time due to depth of post

 

[weeman_mtb]

I have scrapped a frame in the past using the drill method so be super careful.

Lots of other options here http://www.sheldonbrown.com/stuck-seatposts.html

 

[IrvinB]

stem removal

If you havent sawn it off at the frame I can probably tell you how to pull it out.