Take the 2-minute tour ×
Home Improvement Stack Exchange is a question and answer site for contractors and serious DIYers. It's 100% free, no registration required.

I have an existing metal fence post, set in concrete, in which I'd like to drill a new hole in that post.

Normally, I would use a drill press to drill into a curved surface like this. Since the post is already set in concrete, this is not a viable option.

Is there some sort of guide jig or other tool or process to make this task easier? I'm having quite a time drilling even a small pilot hole.

share|improve this question
add comment

2 Answers

up vote 4 down vote accepted

The punch suggested by SpectralGhost is a good idea.

If that doesn't work, you can make a jig with three pieces of 2x4.

pipe jig

Screw the pieces together and drill a pilot hole for the drill bit (the dotted line) using the same size bit you intend to use on the pipe.

share|improve this answer
    
this seems like a great idea. i'll be trying this asap. thanks! –  nullrevolution Jan 31 at 19:15
add comment

I would use a punch to make a small dent in the pole so my drill bit wouldn't slip.

share|improve this answer
3  
Center punch with a sharp 60 degree tip to guide the drill bit, you want a nice conical guide for the bit. Use a small drill to drill a pilot hole as it will be less likely to jump out of the center punch divot, finish out with full size drill bit. Many's the annoying non-flat surface I've had to do, it's all in the start. Make sure the centerpunch has a nice sharp, hardened tip. The usual failure with this method is to use an 20 year old punch that now has a ball tip due to lack of maintenance. –  Fiasco Labs Jan 31 at 18:34
    
i should have mentioned in the question that i've had trouble with the punch method. and i suspect that Fiasco Labs is correct: my punch is far from new and is not terribly sharp. +1 for the thoughts. –  nullrevolution Jan 31 at 19:10
1  
I would add, start at a slow speed and just enough pressure to keep the drill bit cutting. –  mikes Jan 31 at 20:09
add comment

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.