bitsdrillsteel
I had to drill some 1/2" holes in 3/8" steel plates. In addition to taking something like 15 min per hole, a brand new drill bit lasts maybe two holes and it is trash.
What is the best way to drill holes in steel that thick at home, assuming no special tools like a plasma cutter?
I have to ask, who gave you permission to drill into the wall? If you say your spouse, then maybe you need to take some home improvement classes at the adult education night school at your local high school! Just joking.....
But seriously, if you have run into the concrete blocks, you need to use masonry bits with a hammer drill to bore the holes, and than use masonry anchors or specialty concrete screws (tapcons) to secure the brackets to the block. The masonry screws are easiest and the package will tell you what size masonry bit to use. You can use a regular drill, but it will require a lot of pressure and letting off every 15 seconds or so to clear the dust from the hole. Don't be surprised if the screw strips on the way in, very common, it may take a couple of trys. Be sure to drill the hole deep enough. you will get the feel of it. It is not at all like drilling into wood.
I have to mention, if you have drywall over block, then there is strapping somewhere ramsetted into the block. If you can find the strapping, you can use the standard wood techniques. Look for dimples or evidence of drywall screws, that will give you a hint where to find wood. Good luck.
Update 5/12/2013
While my jig below does work, this product is even better!
Big Gator Tools V-DrillGuide Standard Size Portable Drilling Guide
Original Answer
I am answering my own question here with an awesome, home-grown solution to my problem. I fastened two pieces of wood together at a 90 degree angle. Corner clamps made it easy to get it perfect. I then took a third piece of wood and cut a 45 degree bevel off the corner. This piece is my drill bit adapter that fits a number of larger-sized drill bits, but was made with my 3/8" bit in mind. I also made another for smaller sizes (not shown).
To hold the adapter firmly in place and tight against the bit, I use one of my smaller c-clamps. Using this custom guide, I was able to drill a near-perfect hole into the subject. I also used another similar custom assembly that works with a plug cutter bit for my power drill.
No expensive equipment required!
Best Answer
3/8" mild (hot-rolled) steel isn't difficult to drill, but any bit will fail if you get it hot enough to melt the cutting edge. Each hole should take no more than a minute.
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