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Old 23-10-2019, 10:29   #1
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What are your favorite drill bits?

I have been using dewalt titanium for tye last 6-7 years and have been using it on wood and fiberglass with great results. The coating on them has held up pretty well over the years despite the salty humid air inside the boat. I would be curious to hear about favorite drill bits you guys have on the boat.
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Old 23-10-2019, 10:35   #2
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Re: What are your favorite drill bits?

Wood, fiberglass, aluminum, most bronzes, all pretty easy to drill. Stainless steel on the other hand is a PITA.

I use cobalt drills for that. I also keep a "Drill Doctor" sharpener on board for those times when we are far away from a good source of anything. Works great.
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Old 23-10-2019, 10:46   #3
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Re: What are your favorite drill bits?

I have found four of those easy materials any drillbit works. In fact, I have found even for metal any drillbit works. It’s all how you use it.

Taken care to go slowly and keep the temperature down is the key to having the drill bit last. That’s much harder when you are drilling metal. Plenty of lubricating oil and a very slow speed helps with that.
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Old 23-10-2019, 10:53   #4
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Re: What are your favorite drill bits?

The most important thing with drilling stainless steel is that the bit keeps advancing and chips keep coming off. When that rule is not conformed to, the steel hardens so quick that it’ll eat your bit no matter how good it is.
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Old 23-10-2019, 10:54   #5
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Re: What are your favorite drill bits?

My favorite bits are the sharp ones, I love them.
For wood and anything soft they last a long time, but for stainless, forget about your hardware store.
You need the jobber bits from Drill America or Champion, wide angle bits of 135 degrees or more and made in USA, otherwise it will be an exercise in frustration. The proper ones (and used properly) drill SS like butter many times.

https://www.amazon.com/Drill-America...849082&sr=8-96
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Old 23-10-2019, 11:40   #6
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Re: What are your favorite drill bits?

Any bit that hasn't grown legs and ended it all by jumping in the ocean is a good bit.
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Old 23-10-2019, 11:53   #7
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Re: What are your favorite drill bits?

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The most important thing with drilling stainless steel is that the bit keeps advancing and chips keep coming off. When that rule is not conformed to, the steel hardens so quick that it’ll eat your bit no matter how good it is.
"feed and speed". There's definitely a "feel" to it.
Cobalt is nice, but a good bit is a good bit. A cheap bit is not going to last long.
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Old 23-10-2019, 11:56   #8
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Re: What are your favorite drill bits?

Cobalt. More expensive but worth the money.
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Old 23-10-2019, 11:57   #9
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Re: What are your favorite drill bits?

I have a set of Forster bits for wood that I bought at Lowe’s 10 years ago. I don’t use them very often, but when I want a clean hole in teak, this is what I reach for.

Otherwise I have a hodgepodge of DeWalt, craftsman, and Ridgid bit sets that I use, depending on the material.
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Old 23-10-2019, 14:15   #10
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Re: What are your favorite drill bits?

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Cobalt. More expensive but worth the money.


Is Cobalt a coating or the solid material itself? How are they with rust?
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Old 23-10-2019, 15:21   #11
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Re: What are your favorite drill bits?

Carbide, it’s hard enough to drill titanium. But because they are only tipped with carbide they are not as brittle are cobalt.
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Old 23-10-2019, 16:01   #12
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Re: What are your favorite drill bits?

I was initially puzzled by this question - having spent many years drilling heavy steel in my engineering business, I simply view drill bits as consumables. I think what you may be asking is - what is the best drill bit to buy if you dont know how to maintain and routinely sharpen them? Why not learn how to get the best out of any half way decent bit? My process has relaxed a bit on the boat because most things that require drilling are pretty soft but; in general the process is as follows; muster equipment; SHARPEN BITS; set up job; drill; cleanup.
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Old 23-10-2019, 17:16   #13
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Re: What are your favorite drill bits?

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I was initially puzzled by this question - having spent many years drilling heavy steel in my engineering business, I simply view drill bits as consumables. I think what you may be asking is - what is the best drill bit to buy if you dont know how to maintain and routinely sharpen them? Why not learn how to get the best out of any half way decent bit? My process has relaxed a bit on the boat because most things that require drilling are pretty soft but; in general the process is as follows; muster equipment; SHARPEN BITS; set up job; drill; cleanup.
I'm with you - initially I was puzzled and presumed the question is about run of the mill twist bits. I have always just gone to the shop, purchased a half way decent branded HSS bit and resharpened it when needed. Doesn't matter what material you are drilling, the bit doesn't care. It is how you use it that matters!

Then I thought it might it be question about different types of bits - twist, spade, Forster etc

Now I am thinking it something that could be USA specific - maybe they have a huge range of poor quality bits and you have to hunt down the good ones.

Refer to SVTatia's post (#5)
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Old 23-10-2019, 17:35   #14
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What are your favorite drill bits?

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Is Cobalt a coating or the solid material itself? How are they with rust?


Not a coating, I know of no coating that actually seems to do much of anything, I believe it to be a marketing gimmick.
Lightly coated with oil they seem fine.
The way to drill stainless is slow speed and high pressure, what your trying to avoid is heating the material and work hardening it, any kind of lubricant may help.

Only the front face of the bit is actually cutting, so what does making the bit gold do?
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Old 23-10-2019, 18:17   #15
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Re: What are your favorite drill bits?

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..

Only the front face of the bit is actually cutting, so what does making the bit gold do?
Makes you open your wallet
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