drill bits

x companys drill bits went up on their price-i buy a 100 at a time -any ideas wherew i can purchase quality drill bits at a good price?

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Not sure what you were apying for bits. I use bits from Janvil.
Good bits at good price.I think they are about .90 to .95 per bit when you buy 100.

www.ohnonotagain.com</p>

I use the Delta Kits FG169 i think they are called .. the best I have found anywhere... small yet durable. The most important thing to me is that they do not make a huge hole when drilling.

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I have been using several kind of drilll bits. some with round tips other with stright pointed tips.

1. Why are there some many kinds?
2. And how do you tell which ones to use?
3. Do andyone have informaiton on which bit to use?

rickyreed@hotmail.com

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rickyreed,

Good questions. There are different styles to fit a host of varying applications and give the user a choice. The result desired will determine your choice. Most bits will accomplish our goals in most situations so it will probably boil down to a preference issue.

If you use a large diameter bit such as the round tips, the diameter of your hole will also be bigger. This will produce a minor cosmetic difference compared to a small diameter bit like the tapered style. This type bit would be better for cleaning/opening up lager impact points.

If you use the smaller diameter bits such as the tapered tips, your inside hole diameter will be smaller and although its a mild difference, more cosmetically appealing. I would use these for small impact points that need to be opened up or stop drilling the end of a crack. I would suggest that you use a slow RMP with any style bit to prevent the drill bit from walking during the initial contact on glass. There are different outlooks on when to drill and when not to. I will give you mine...

I almost never drill stone chips unless the impact point will not allow resin to flow or if the break will not fill. This usually can be determined by gently flexing the glass. Almost 99% of the time I use the tapered style bits in these circumstances. I always stop drill and anchor cracks to relieve the stress. I also always use the tapered style bit in this situation. I have found that the tapered style bits meet my needs almost all the time but I have other styles should the break require it.

What ever style use choose the end result should always be a properly filled and cured break. I hope this helped somewhat.




Pay it foward,

Brian
www.safeglasstechnologies.com

info@safeglasstechnologies.com</p>

Tapered burs, round burs pear shaped burs and dozens of other shapes are available in a variety of different sizes. For instance, round burs are available with tip sizes ranging from .020" to .177". The shape and size that you select is largely a matter of preference, however there are a couple of things to consider.

It should be noted that there are sometimes huge differences in the quality of burs so you cannot go by shape alone. A poor quality bur will not work well regardless of the shape or size.

Tapered burs typically drill faster and last longer in the tests that we have performed. Care must be taken to avoid skipping and binding in the hole.

Round burs are typically a bit slower and don't last as long but there are few problems with skipping or binding in the hole.

Pear shaped burs such as the FG329 are a happy medium for many people. They offer relatively fast drilling and good durability while minimizing the chances of skipping or binding.

I highly recommend a larger bur such as the FG701 if you are creating bullseyes by tapping in the drill hole with a probe. The Delta Kits 77-7G works very well for this purpose, creating a perfect little bullseye nearly every time. We have experimented with many burs and many different pointed tools to create bullseyes, and this seems to be the best combination. Using a smaller tool often creates a small star break and using a larger point in a small hole often creates surface damage. Not everyone will agree on this, but that was our finding after some extensive testing.

Although there are literally hundreds of combinations of bur shapes and sizes that are offered on a special order basis, Delta Kits and other suppliers generally only list those that are the most popular and have been found to perform the best for windshield repair.

In our testing, carbide burs are more popular than diamond burs, because they work well without the use of a cooling fluid, drill faster, last longer and cost less.

My advise is to try several shapes, sizes and brands. You will probably find one that you are much more comfortable with than any other. That's the one for you. As I said, it is really a personal preference in most cases.

Good luck,

Brent Deines
Delta Kits, Inc.

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