Are you guys trying to drill one of those H channel green sign posts? that is some crazy metal that they use for them I’ve never been able to drill them out, curious what you come up with, since I’ve never had any luck drilling them out, I’ve always used 5/16” bolts instead of 3/8” ones
I am trying to drill thru roadway sign posts, mine are not green however, but there about 30 yrs old, was given a bunch yrs back and they been sitting my metal pile till last yr when I started building a retaining wall
I am using either 3/8 x 8 inch lag bolts to secure them into the wall itself , which is 12 x 12 inch think timbers(railroad bridge decking timbers) there 15 ft long!
I sunk the sign post in the ground along property line and building fence up against them, and was attaching them to wall as layers went on, to help act as a prevention to keep timbers from going over the wall, as been working alone, and there pretty heavy timbers 700-850 lbs they vary in weight
so bolting the sign post as I go as it helps prevent leverage from happening and just pushing /bending the post over and the timbers flush against things as I place them and hammer in 1 inch re bar to keep them connected!
I just ran out of pre made holes in the sign post(they had about 4 ft of holes in them, them
never thought be so hard to drill thru 1/8 inch or so thick metals , ruined a bunch of bits trying so far, and I tried a few different types of bits, like in the link above I posted, they claimed would work when I talked to them, but didn't,
I only have two more rows to add, so I an Maybe get by without at this point,just trying to keep things looking uniform I think more than any real need at this point,
SO, if i could get rest of the holes made, I'd install the lag bolts I have
I was looking at a conversion to make a angle grinder into a Die grinder, as I do have a cordless grinder, that I might try with a carbide burr like Tracker stated, I think that might be what's needed
and I will order a few new drill bits he suggested too, and see if they work
Got 5 projects going at once here, so, picking on things as I can and weather and health allows, going from indoor projects to outside one's., little at a time, ain;t no race for me anymore to get things like this done!