Which drill bit?

[High Altitude]

For those using Delta drill bits/burs, which one do you prefer to use to pop a bullseye or drilling a chip/crack when needed?

I have the standard bits that come with their kits, the tapered bit FG701 and the round headed bit, FG2. I have limited practice with both (I am going to practice much more before even attempting to drill a customer's windshield) but it seems that no matter how careful you are, even with proper technique, the tapered bit could get away from you every now and then (maybe the chip is in a tough location etc....)

If it gets away from you and scratches the glass a little, is there anything you can do to make the damage look better or are you pretty much SOL.

[kenb81]

Next time start drilling at a 45 degree angle and then stand the drill up this will prevent drill slipage

[jonnyques]

That is the way to use the 701. By starting on an angle you create a divit for the bit to center in as you rotate the drill up verticaly. I perfer the 701 as I find it has a longer life span than the others.

[Gregg]

I too have limited practice drilling as I just recieved my Delta kit a few weeks ago. When practicing I had the problem with the drill bit skipping away and scratching the windshield. Lucky for me I got it from the junk yard. So being that you start in at a 45 degree angle and then bring up the drill vertically, is there a certain speed you should be doing this? Should you press in hard or light?

Also what is the best way to make practice breaks. Seems the BB gun I used made too much damage or it looked unrepairable?

[kenb81]

I always drill on low speed (dremel) and no need to press hard just let the drill do the work

[jonnyques]

Kenb Ive always use the high speed? Jeff what speed does Delta recomend? There isn't the need to push. If the drill is cutting it will just do its thing. You will get the feel for it. Making brakes, a spring loaded center punch will make stars. Very the spring preasue to adjust to the size of break you want. For Bulls, the BB on the elastic works great. I dont know if delta sells them. GM and LR do for sure. You can also take a heavy weight standard screwdriver and strike the glass with the edge if the tip ( just the corner of it). I have also found this to make realistic breaks.