Agree with all of this and second it. For best results it's best not to use a hand drill. The bit will cone slightly in your hands and hands and you'll find filament strands getting ripped out of the matrix. Support the material on both sides if possible and use a bushing or drill press as a guide.we drill LOTS of holes in composites at the day job, couple of things that can help,
1) step your way up to the final size, for 1/2 inch I would drill a 3/8 to start, followed by 7/16 then 1/2inch (see note 6), high speed low force WATER!
2) ALWAYS back up the hole, pvc pipe or wood can work well
3) carbide tools
4) drill them wet, dip the drill bit in water before AND after drilling the holes, lubricates and cools
5) use a drill press or an 'egg cup' if you can to hold the drill straight
6) use a dreamer (drill reamer) or dagger drill for the final cut, not a twist drill
7) if you have to use a twist drill, use one for composite 120 or greater angle, multiple flute, don't use brad point unless you have everything held VERY rigid
For larger holes use a grit hole saw and an arbor (3/4 or bigger)
(composite manufacturing is the day job)
THIS... for sure, big fan of step drill bits. They are very spendy from the typical big box stores. I got mine from Ebay for dirt cheap, very happy with them.For holes that large, take a look at 'step drill bits'. A good one works well. It's how I drill 1/2" holes for Schurter switches.
You take your drill. Unscrew the chuck on the drill. Insert a drill bit. Tighten the chuck. Then you actually drill the hole in the fiberglass tube. Not the hard or difficult. Simple really, its not rocket science lol. But seriously its not hard. Most important is to work your way up from smaller drill bits to larger one's. Start out with a tiny one then go up from there.ok I know it may have been posted already but whats the best way to drill a 1/2" and a 5/8" hole in G12 fiberglass tube. its for my switches