Effect of drilling hardened linear rails?

[irving2008]

Because george, that will on provide support in one direction... when used in a Z-axis the forces are both into and away from the support...

personally I'd not both trying to drill it, whats wrong with using proper pre-drilled supported rail?

[Jonathan]

I can't find pre drilled rail cheaply. Using proper supported rail is more expensive than what we're discussing.

With regards to drilling it I was thinking just use a carbide drill and *plenty* of cutting fluid/coolant. Carbide drills are cheap enough on eBay.

[Peter Griffin]

What about spark eroding the C/bored holes in the rail and tapping the support.