[MBViklund]

For reasons I can't understand, I seem to have a hard time getting deep drilled holes to go anywhere near straight. If I drill a hole, of almost any size, 1" deep, even through aluminum, the bottom will be significantly offset, in a seemingly random direction, from the top. The machine is well trammed, and I'm using quality, name-brand drills, and peck-drilling.

When I need both ends of a hole to be properly positioned, I'll drill half-way through one side, then re-drill the full depth from the other side, but this should not be necessary....

Regards,
Ray L.

Have you checked that your column is square to your table? Even if the drill is always perpendicular to the table it could be moving sideways if the column is not square.