https://www.amazon.com/gp/aw/d/B001CZH2SK?vs=1
Looking for a good set of drill bits for drilling steel. My DeWalt Cobalt(probably Cobalt coated) have worked great for me in thin steel, soft metal or wood but just won't handle drilling out a broken bolt. Any thoughts on the ones in the link or other suggestions? I love Mac's warranty on bits but until my money tree starts growing in the yard I need to avoid making many tool truck purchases.
Good drill bits for drilling steel
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Hanson?
Originally Posted By: Rand
Maybe read up on drill bits.
Cobalt bits are an alloy not a coating.
Titanium or black oxide are coatings.
Titanium is harder than cobalt bits but cant be sharpened.
Also the style of bit can determine how fast and efficient they are.
In that case I'd start with some cobalt bits.
Some cobalt bits can have a "gold" coating that isnt a coating but is a result of the manufacturing process.
https://www.amazon.com/DEWALT-DW1263-14-Piece-Cobalt-Pilot/dp/B00004RGVZ
I got jobber bits in Cobalt for pilot drilling bolts, gun recievers etc. Pilot drilling a bolt before tackling with a large high speed bit and a good amount of oil to help cool. May want to learn how to weld on a nut to the broken bolt. The heat helps break the bond of the bolt to the part and shot of penetrating oil helps shock it often times allowing to back it out without hardly any effort.
Originally Posted By: NHGUY
I really like Milwaukee's drill bits.
I second the call to go extremely slow and use lots of oil
The usual HSS (high speed steel) bits have always worked great for me. You have to match drill speed for the diameter of the bit. Small bit = higher RPM, large bit = slower. I don't usually use oil unless I'm using a dull bit, or drilling into something hardened, like a high grade bolt or something. Don't buy your bits at Walmart or Target.. Lowes/Home Depot can be hit or miss. Quality bits are usually found at your local construction store-- Whitecap, HD Supply, even Fastenal sells good ones. If it's cheap and has a fancy gold or other colored coating, you're buying garbage, in my experience. I've seen two good kinds: regular HSS, and the titanium and/or cobalt ones that cost a pretty penny. Both are good, the latter is better.
Originally Posted By: 92saturnsl2
The usual HSS (high speed steel) bits have always worked great for me. You have to match drill speed for the diameter of the bit. Small bit = higher RPM, large bit = slower. I don't usually use oil unless I'm using a dull bit, or drilling into something hardened, like a high grade bolt or something. Don't buy your bits at Walmart or Target.. Lowes/Home Depot can be hit or miss. Quality bits are usually found at your local construction store-- Whitecap, HD Supply, even Fastenal sells good ones. If it's cheap and has a fancy gold or other colored coating, you're buying garbage, in my experience. I've seen two good kinds: regular HSS, and the titanium and/or cobalt ones that cost a pretty penny. Both are good, the latter is better.
Originally Posted By: 92saturnsl2
The usual HSS (high speed steel) bits have always worked great for me. You have to match drill speed for the diameter of the bit. Small bit = higher RPM, large bit = slower. I don't usually use oil unless I'm using a dull bit, or drilling into something hardened, like a high grade bolt or something. Don't buy your bits at Walmart or Target.. Lowes/Home Depot can be hit or miss. Quality bits are usually found at your local construction store-- Whitecap, HD Supply, even Fastenal sells good ones. If it's cheap and has a fancy gold or other colored coating, you're buying garbage, in my experience. I've seen two good kids: regular HSS, and the titanium and/or cobalt ones that cost a pretty penny. Both are good, the latter is better.
Saved for future reference.
Toledo Consolidated
triumph - Lots on ebay too...
http://shop.triumphtwistdrill.com/product
HUOT HSS AT 135 DEGREES. I have a full set of 1/6 to 1/2 and the sizes over 3/8, I centerless ground the shanks to 3/8'. I can use them in my Milwaukee 3/8 drill. I've had and used them for 35+ years. Ed
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Other than super expensive solid carbide drill bits M42 cobalt is the way to go not the cheaper M35. These are not the best but decent enough for the money.
http://www.ebay.com/itm/29-Pc-Cobalt-Dri...725.m3641.l6368
Left handed
http://www.ebay.com/itm/USA-Left-Hand-Drill-Bits-Drills-Screw-Extractor-EZOUT-Lifetime-Warranty-USA-MADE/171812561365?_trksid=p2047675.c100010.m2109&_trkparms=aid%3D2220072%26algo%3DSIC.MBE%26ao%3D1%26asc%3D39107%26meid%3D0c7d99097108483cb2f175e55c879934%26pid%3D100010%26rk%3D4%26rkt%3D6%26mehot%3Dpp%26sd%3D181713613940#rwid
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