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Countersink in steel bit

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Forum topic by willhime posted 12-08-2019 08:27 PM 264 views 0 times favorited 5 replies Add to Favorites Watch
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willhime

146 posts in 2146 days


12-08-2019 08:27 PM

Topic tags/keywords: jig question resource tip trick drill press joining milling

I’m making some steel support straps for a chair design and using what was purported to be countersink bits good for steel but they give out after about 10 uses into my steel. Does anyone know of some good countersink bits that are specific to use on metal that won’t dull super fast as the ones I get from big box stores ? The irwins have been tapping out pretty quick

-- Burn your fire for no witness


5 replies so far

View CaptainKlutz's profile

CaptainKlutz

2251 posts in 2102 days


#1 posted 12-08-2019 09:24 PM

+1 Most BORG Drilling stuff is not the best quality (except the Bosch hammer bits).

If you want quality metal working tools, visit an industrial supply. Online would recommend MSC Direct and McMaster due very broad products lines. They carry cheap Chineseium tooling, American made quality steel tools, and even carbide countersinks.
While discounted below retail; the prices on quality tools from both of them are not cheap. Best to sign up for monthly/quarterly sales fliers for best deals. Is normal to find 15-40% off regular prices. During sales can buy 1/4 & 1/2” carbide spiral bits for half what they cost from wood working stores.

Try these link for countersinks:
https://www.mcmaster.com/countersink-tools
https://www.mscdirect.com/browse/Holemaking/Countersinks-Chamfer-Mills-Back-Chamfers/Countersinks-Sets?navid=12106081

BTW:
A normal countersink can also be sharpened just like drill bit. Quick and dirty solution is to clamp a guide block to grinder tool rest at proper angle, and rotate by hand against a fine grinding wheel.

Metal boring requires lubricant. You must have lubricant to keep tooling cool, and remove the scarf. Otherwise the edge overheats, softens, and is easily dulled.

Cheers!

-- I'm an engineer not a woodworker, but I can randomly find useful tools and furniture inside a pile of lumber!

View jbmaine's profile

jbmaine

91 posts in 77 days


#2 posted 12-08-2019 09:44 PM

Was in the metal working trade 40 years. My number 1 go to countersinks are Weldon single flute countersinks. Mcmaster carr, MSC all carry them. FYI, they work great in wood also.

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willhime

146 posts in 2146 days


#3 posted 12-10-2019 12:40 AM

Is there a specific application for zero flute vs single flute ?

The single flute weldons seem impossible to find. Every link I go to is pushing their zero flutes

-- Burn your fire for no witness

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jbmaine

91 posts in 77 days


#4 posted 12-10-2019 01:44 AM

Sorry if my terminology wasn’t accurate. This is the style I’m refering to.

They come in different sizes, don’t chatter, leave a smooth hole, For most flat head screws you’ll need 82 degrees. If you were closer, I’d lend you one of my sets.

View Lazyman's profile

Lazyman

4515 posts in 1995 days


#5 posted 12-10-2019 04:44 AM

I like this style.
This is the cheap set from Harbor Freight but there are better quality ones that will last longer.

-- Nathan, TX -- Hire the lazy man. He may not do as much work but that's because he will find a better way.

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