I need to mount two 4 hole brackets in bathroom ceramic tile. It's been eons since I had to do this sort of thing, and I recall that getting the holes accurately placed wasn't easy. I'll be using either 1/4" or 5/16" diameter plastic expansion anchors. Two holes for each bracket can go on a grout line, and I seem to recall that made things easier.
I have a couple of the old style carbide tipped bits with a regular sort of point and a fat spiral grooved shank. I've also seen some newer bits that have a sharper point & a straight shank that they claim can drill through glass as well as tile. The sharp point seems like it might go in straighter if I can get it started in the right spot.
One thought I had was to use a burr in my Dremel to get through the glaze. I can then get the bit started in the softer tile material & hopefully keep them from wandering.
Any other suggestions for bits to use and/or techniques for keeping everything lined up would be appreciated.
Thanks!
Doug White