Windshield Repair Forum

just wondering if anyone has compared quality of drill bits? There are different shapes and sizes, each that does its own job best. What Im questioning is the longevity of the bits. I had some from LR, they were a bulk bit as they were not in a blister pack. I found that they dulled very fast. The only other bits Ive used were from Delta. They were in blister packs. Ive found that they have lasted much longer. Ive found cost can very around $1 per bit, which depending on your repair technique may be alot or very little. There has even been someone selling bits on ebay, quality?? who knows. Perhaps you guys can share which you perfer, or is cost the deciding factor. Have a good day eh!

The best drill bit I have found is Delta's FG329 Pear Shaped Point Carbide Bur.
Almost no scarring of the repair and great for getting access to parts of cracks which will not fill. It must be used with an 80-11 sewing need for popping mini bull's eyes or you may chip the glass. It makes a very small hole.

I buy mine from a local dental supply warehouse. Usually around $1.20 per bit. I buy the FG-3 bits. They work well for me. I figure I get about 15 drills per bit. That's a guestimate.
BOYD

I have bought them from the dental supply in the past and WR suppliers as well really havnt noticed much difference. Up until recently I have used the same bit for a several weeks but after switching to my new drill with its 10,000 rpm low speed instead of the old ones 5,000 rpm I find im going through alot more bits ( 1 about every 20 repairs that require the drill) bits are cheap so who cares? I like the new drill well enough that it really doesn matter much.

When drilling do it in a couple of second bursts so that the drill does not get hot this will increase the life of the bit.

Resin also is a fantastic lubricant this means with carbide tips they will just heat up without actualy removing much glass so try and get your drilling out of the way before you star injecting resin.

I personaly use a drill on every job I if only to clean out the pit area (I know not everyone agrees with this) and I have just had 50 bits last me for

I use a cordless dremel (10.6 v lithium) that cranks up to 35,000 rpm. (but I normally only run it up to 20,000 rpm) Best tool I ever owned! Last 30-45 days before recharging. With the carbide bits I use....my drilling is done in 3-6 seconds. You'd think at that speed I'd be burning up 1-2 bits a day. Wrong!!! Try 2 bits per month @ $ 1.00 a bit.

Drilling into glass is really a touch that you have to master. Everything with drilling boils down to nothing more than not heating up your bit past it's limits.

Higher RPM dremels will actually save you drill bits if used properly.

I used Janvil drill bits for years but now that they're not in the windshield supply business anymore, I have found a new source for my carbide bits and they are "Glass Magicians". You can find them on line. Great service and more then willing to help me out. These bits are great for drilling and last thru several jobs.