I got the idea to try to drill the hole in my gas block and use a standard Uncle Mikes bolt type swivel stud through the hole with the nut on the other side. I went out to the garage and started to drill using a small bit then the next larger and so on. I finally got to the drill bit that is the size of the screw and I can't get the damn thing to drill any deeper than a few millimeters on each side. It seems like the metal just got really hard and now my bits (I had three) are all discolored and dull from the drilling.
Any ideas? Or am I just doing something really wrong?
As it stands right now I have my sling just wrapped around the forend. Problem is that it slides forward onto the barrel. As we all know the barrel gets really hot after a few mags through, and I use this gun as my CQB gun meaning lots of rounds per practice session, hence really hot barrel.
Yep, the gas block is very hard high carbon steel. It's good stuff....
When drilling into really hard metal, stuff that's almost as hard as your drill bits, you have to remember 1 thing. DON'T get the drill bit hot. You have to drill slow and use lots of thin drilling oil. I use marvel mystery oil and a variable 3/8's drill and drill slow and oil constantly. You want the drill to cut not grind. Grinding creates heat, heat takes the temper out of the drill bit, it dulls, is ruined, etc.
Since you drill bits are discolored I don't think I'd try to sharpen the drill bits (assuming you had a way to sharpen them). I'd go to the hardware store, not walmart, and get the best or near the best drill bit the size you need. Also get a bottle of marvel or other drilling oil. Then drill slowly, keep the drill bit soaked in oil. If you see smoking oil stop drilling, let cool, add more oil, start drilling again. It'll take some time, you might want to get a spare drill bit just in case, but if you drill slow and well oiled (keep it soaked) you'll get through it. It'll take some time but you'll get through.
Go to a machine tool supply house and buy carbide drill bits. You will also need a dozen good taps and a punch to break out the remains if you decide to tap the block for the swivel. Lots of oil, real slow, and absolutley straight with a good drill press. If the quill is too loose they'll bend and break. If you tap, consider the cost of a good tap guide for your drill press a worthwile investment, good taps aren't cheap.
Originally posted by CPTD@Mar 15 2005, 02:35 PM I got the idea to try to drill the hole in my gas block and use a standard Uncle Mikes bolt type swivel stud through the hole with the nut on the other side.
Gundoc, I don't think he is going to tap the block, just put the qd swivel through it and have the nut on the other side.
I wouldn't tap the gas block, too much work!
After I drilled out my gas block I just use the hole in the gas block to attach my slings to. Depending on the swivels you use on your sling the swivel might not close all the way but it works. I also have a qd sling stud, machine threads, that I put in the forend of my mini. I use for a sling now or for a bipod.
I thought he was going through the side......duh! I drilled the factory hole out at the gas block and took a file to it to make it narrower to accept a standard swivel mount. these days I use a mill so it looks prettier, but same principal.
i dunno why every one thinks this is hard... i used a 12v cordless drill and a couple of cheap metal drill bits. no oil or anything else fancy. took maybe 2 min total after i got my tools out lol. just go nice and slow and put a little bit of pressure on it. i did this even before i found this board lol.
I melted SEVERAL gold colored bits but got the SOB drilled. Try Uncle Mikes Premeir swivels, I used them w/o any problem. Have a light and vertical grip on mine and it does not interfer with the sling.
Those gold colored bits are Titianium tiped bits. (BTW titianium is not gold colored its grey) Everyone thinks titianium is the hardest metal on earth (well it isn't) so on a drill bit with it on there must be for hard metal. I have drilled many titianium parts on aircraft. It's hard but not that hard, but it is light weight, strong, and retains it's strength in high heat conditions. I use carbide or cobolt drills to drill it. Sharp edges such as using it on a drill bit, or firing pin, it tends to splenter off. Not good when drilling hard metals with it. If you look at the drill bits package and its uses, the first thing is for wood. It may last longer than hi-speed bits when drilling soft materials, but not hard metal.