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Dropped Carbide Bit/Blade Failure

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Forum topic by PittsburghTim posted 01-01-2014 04:52 PM 552 views 0 times favorited 9 replies Add to Favorites Watch
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PittsburghTim

213 posts in 976 days


01-01-2014 04:52 PM

Topic tags/keywords: blades bits carbide safety

Another forum topic has caused me to wonder about the failure mode of carbide router bits and blades. I have always been fearful of using any carbide bit or blade that has been dropped in the shop. I know that carbide is extremely hard and I assume that it is brittle as well. For the very few times that it has happened, I have never used them again. Throwing these out seems wasteful, but I cannot see risking a piece of carbide flying at me for the cost of a new bit or blade.

Does anyone have any authoritative info on this?

-- She asked me, "Who are you going to please with that?" I said, "Me."


9 replies so far

View Nubsnstubs's profile

Nubsnstubs

160 posts in 384 days


#1 posted 01-01-2014 05:00 PM

I think I would be more concerned about cutting through a knot than using a carbide blade that’s been dropped. if carbide was to take flight, it would only be when the saw is first started. Once started and cutting, if you’ve raised your blade properly, you should have only a small amount of blade that would allow carbide to fly in your direction, plus, you should be standing out of the line of fire when cutting anyway…... Experience is from 30 years of owning and operating a custom cabinet shop…......... Jerry (in Tucson).

-- Jerry (in Tucson)

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DKV

3136 posts in 1158 days


#2 posted 01-01-2014 05:47 PM

Wear safety glasses and you should be ok.

-- My bad, 2015 is the correct year...

View bowedcurly's profile

bowedcurly

482 posts in 382 days


#3 posted 01-01-2014 06:30 PM

If you don’t want it I will take it, just kiddin, really I will, it should be fine, take a small brass hammer and ping the teeth from the back side, a clean sound you will hear and if you hear a different tone then you have a problem

-- Staining killed the wood<<<<<>>>>>Dyeing gave it life

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bowedcurly

482 posts in 382 days


#4 posted 01-01-2014 06:33 PM

or a brass rod this will be light taps, the sound will be the same unless you have a broken tooth or crack in the plate

-- Staining killed the wood<<<<<>>>>>Dyeing gave it life

View knotscott's profile

knotscott

5455 posts in 2029 days


#5 posted 01-01-2014 07:26 PM

I’d just send it to a well qualified sharpening service….tell them what happened, and ask them to go over it and correct any problems, as well as sharpening. Forrest, Ridge Carbide, Dynamic Saw, Scott Whiting, etc.

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

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unbob

397 posts in 557 days


#6 posted 01-01-2014 08:46 PM

This 12” rip blade lost a partial tooth. It hit the blade gaurd hard.
A quality blade that came with a saw, used, in a box loose with other blades. Most likely received a sharp blow, and cracked the carbide, only to let loose in use.
This saw spins the blade at 4000rpm, a tiny piece of carbide coming off is no joke..
There is no way I will place myself in front of any blade at anytime.
I had the blade repaired, nice rip blade.

View NormG's profile

NormG

4175 posts in 1657 days


#7 posted 01-01-2014 09:03 PM

All great suggestions, anything that comes at you 4000 rpm or more is not to be taken lightly. Again though it is a personal choice if you do not feel safe better not use the tool

-- Norman

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knotscott

5455 posts in 2029 days


#8 posted 01-01-2014 10:35 PM

4000 rpms is child’s play compared to a router bit spinning at 22k rpms! :-0 ;-)

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View unbob's profile

unbob

397 posts in 557 days


#9 posted 01-02-2014 12:00 AM

The actual cutters edge surface speed is close to the same on a router bit and a saw blade, even with the rpm difference.
I have never used a router bit extension, that would add to a fling factor, if a bit/extension should pull from a collet.
I am going to try bowedcurly’s test much like testing grinding wheels, I have a lot of blades, I have not tried yet.

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