Broken bit

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Forum topic by emiliof posted 06-11-2013 11:36 AM 941 views 0 times favorited 6 replies Add to Favorites Watch
View emiliof's profile


33 posts in 2191 days

06-11-2013 11:36 AM

Topic tags/keywords: question router

I accidentally dropped my router, which had a 2-flute, 1/2” shank, 3/8” straight router bit. It seems that nothing happened to the router but the tip of one of the flutes broke. Actually the flute lost about a half of its surface. I have not used the bit since, just in case it is dangerous.

There are single-flute bits around, so would it be safe to continue using the broken bit?

-- Emilio

6 replies so far

View Kaleb the Swede's profile

Kaleb the Swede

1875 posts in 2167 days

#1 posted 06-11-2013 11:50 AM

Straight bits on the whole aren’t that expensive. I would get a new bit, rather then mess up the what I am working on. Maybe the guys who have been doing this longer may have a different opinion, but I myself wouldn’t risk it. If there is a hairline crack that you can’t see now, and it is spinning at the typical RPM’s of a normal router, the whole bit can come apart, and then the ouch begins. Hope this helps

-- Just trying to build something beautiful

View scotsman9's profile


134 posts in 2086 days

#2 posted 06-11-2013 11:53 AM

I agree with the Swede, don’t risk it if it may contain fractures.

-- Just a man and his opinion.

View NiteWalker's profile


2738 posts in 2774 days

#3 posted 06-11-2013 11:53 AM

Don’t use it.
There may be micro fractures in the carbide you can’t see.
Spinning at 20,000+ rpm greatly amplifies the chance for the carbide to shatter in use.

It happened to me with a rockler bit; all looked fine, but when I went to use the bit again, the chipped flute shattered. The workpiece was the only victim, fortunately.

-- He who dies with the most tools... dies with the emptiest wallet.

View HorizontalMike's profile


7770 posts in 3112 days

#4 posted 06-11-2013 12:25 PM

FWIW, I once broke an up-twist spiral bit on my horizontal mortise machine when initiating a mortise. I was standing at 90-degrees to the centrifugal force and luckily was not injured. I NEVER found the broken end of the bit. And this was inside of my closed shop. Scary stuff…

-- HorizontalMike -- "Woodpeckers understand..."

View emiliof's profile


33 posts in 2191 days

#5 posted 06-11-2013 12:37 PM

It didnĀ“t take me 10 seconds to throw the bit to the garbage bin after I read your answers. Thank you all guys!

-- Emilio

View SnowyRiver's profile


51457 posts in 3678 days

#6 posted 06-11-2013 12:47 PM

I agree with everyone too. I wouldnt use it. Buy a new one. It isnt worth the risk.

-- Wayne - Plymouth MN

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