Drilling 16mm metal plate...

[skylite]

Hi,

What do you use to drill 16mm metal plates? Normal drill may not work..

What is your comment on the technique of using acetylene torch to put a hole in the metal plates? But it doesn't exactly put a 16mm hole.. but bigger.. so if you use a washer and nut. would it no longer be an effective anchor because of the washer?

The metal plates will not be used for column but for supporting a rafter gable middle (image 2 wide flange welded together and supported by the metal plates)

 

[Brad805]

We have allowed the contractor to oversize the holes in these cases with a torch and then weld a plate to the existing base plate with the appropriate hole size for the bolt. Field drilled anchors can end up at odd angles and spacings, so there are cases where one can appreciate the reality of what the contractor is trying to do.