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Causes of broken carbide tips? Now missing 5 on my 80 tooth plywood blade.

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Forum topic by Shamb3 posted 06-05-2020 12:42 AM 1649 views 0 times favorited 37 replies Add to Favorites Watch
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Shamb3

41 posts in 1299 days


06-05-2020 12:42 AM

I have a full kerf freud industrial plywood/melamine blade.
Over the last few years I have built a router table and some other shop projects with it.
I cut about 15 sheets of 5×5 Baltic birch in half on my table saw using the blade and made the cuts to build the base cabinet carcasses for a miter station.

Today I cleaned the blade and noticed 5 carbide tips were broken in half and several others didn’t look perfect.

Is there anything I possible did to cause them to break? I just got a thin kerf version I haven’t used yet and don’t want to damage it if I can help it.


37 replies so far

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ohtimberwolf

1083 posts in 3470 days


#1 posted 06-05-2020 12:03 PM

No help with your question but please be careful. Where did those pieces of flying carbide go when they came off…..
Protect yourself if you ever use that blade again. I would toss it. larry

-- Just a barn cat, now gone to cat heaven.

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OldBull

414 posts in 414 days


#2 posted 06-05-2020 12:37 PM

Maybe freud would like to see it and make a trade with you ?

Can I ask what you are cleaning it with? Are you soaking it?

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ohtimberwolf

1083 posts in 3470 days


#3 posted 06-05-2020 12:56 PM

Ditto to OldBull larry

-- Just a barn cat, now gone to cat heaven.

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HokieKen

17916 posts in 2257 days


#4 posted 06-05-2020 12:58 PM

That’s most likely not anything you could have prevented Shamb3. There are two likely suspects: Either something embedded in the plywood you were cutting or, most likely in this case, a shoddy batch of carbide or crappy brazing job. If the blade is relatively new (less than a year old), I’d contact Freud about it. Try to get some close up pictures showing the breaks to send them as well.

I have two of the Ultimate Plywood and Melamine blades from Freud and have never had an issue with either one and both have been through at least one sharpening.

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

View LeeRoyMan's profile

LeeRoyMan

1838 posts in 845 days


#5 posted 06-05-2020 01:34 PM

Were the broken teeth all together?
Anyone else have access to your blades?
How do you store them?
I’ve never just seen teeth break and definitely not in multiples.
If I had to guess the blade was dropped, or hit something while cutting, or just mishandled.
I’m not accusing you of anything, just that I’ve never seen it.

I’d be curious to see some pictures of the broken teeth.

View pottz's profile

pottz

17542 posts in 2102 days


#6 posted 06-05-2020 01:41 PM

well it’s way to old to return now but as leeroy said ive never seen a blade have teeth break like that unless you maybe hit something you wern’t aware of.i would not use it any further though,the last thing you want is to get hit with a piece of carbide,plus the blade will be un balanced.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

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MrRon

6040 posts in 4362 days


#7 posted 06-05-2020 05:05 PM

You say the teeth are broken? not just chipped. I have a Forrest blade that has teeth that have chipped corners, but no “breaks”. Sounds like it could be faulty carbide. Contact Freud.

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hcbph_1

98 posts in 432 days


#8 posted 06-05-2020 06:26 PM

Actually I’ve seen crap dumped into plywood a time or two. One looked to be part of a beer can. Any potential items like metal or even gravel can cause carbide damage.
Be safe, put that one on the shelf permanently.

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Shamb3

41 posts in 1299 days


#9 posted 06-05-2020 06:26 PM

The blade is about 3 years old so I don’t think a return of any kind is going to work. My main concern is to not break any on new blades.

Carbide is definitely broken not just chipped. Maybe 1/4 of the carbide is still attached.
4 of the 5 broken ones are within a 15 tooth span.
I didn’t soak it. Just diluted simple green and a nylon brush.

I have always been careful with it because it is a relatively expensive blade. My 40 tooth combination I have owned longer and used more has only 1 broken tip.

Storage might have been a issue. Until recently I didn’t have a good place to store blades. Often it was in a plastic bin usually in a cardboard sleeve but sometimes not.

Could inexperience on the saw break teeth? Say if a sheet of plywood rises up a little during a cut? The blade getting pinched some from not flat edges against the fence?

It is possible i hit a few staples and never even knew they were there.

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pottz

17542 posts in 2102 days


#10 posted 06-05-2020 07:15 PM

i dont think a staple would do that much damage it would need to be something a lot heavier,ive cut many a staple in my time without a problem.you may never know.

-- working with my hands is a joy,it gives me a sense of fulfillment,somthing so many seek and so few find.-SAM MALOOF.

View bmerrill's profile

bmerrill

127 posts in 1192 days


#11 posted 06-05-2020 08:37 PM

Time to buy a replacement.

-- Woodworking, the transformation of nature to culture.

View sansoo22's profile

sansoo22

1673 posts in 773 days


#12 posted 06-06-2020 12:26 AM

I’ve had a diablo combination blade lose a carbide tooth. It was one of those dual blade blister packs someone bought me for Christmas. They aren’t packaged well and it was the front blade. I’m assuming it banged into the body of the one behind it. I tossed both after that and told family not to worry about saw blades as gifts anymore. I also store all of my blades in cardboard sleeves now.

View HokieKen's profile (online now)

HokieKen

17916 posts in 2257 days


#13 posted 06-06-2020 12:59 AM

Nah, not a staple. A carbide tooth won’t even notice a staple. It would have to be something pretty sizeable and pretty hard to bust 5 teeth.

-- I collect hobbies. There is no sense in limiting yourself (Don W) - - - - - - - - Kenny in SW VA

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Kazooman

1540 posts in 3070 days


#14 posted 06-06-2020 01:08 AM

I guess carbide has its issues. About thirty years ago, I purchased a high quality, carbide, edge profiling router bit from a big name manufacturer (at the time) from my local hardwood supplier. I tried the bit out on a piece of red oak cutoff from my project to set the exact height and depth on my router table. About two inches into the pass the bit shattered embedding a good chunk of the carbide into the workpiece (thankfully not into any part of my body). I sent pictures and the chunk of oak with the piece of shattered router bit to the manufacturer asking for a refund. ZERO. response. I guess it was my fault for assuming that their carbide could cut red oak. Good luck with getting the manufacturer to admit to a faulty product. Their lawyers have trained them well to deny any such claims.

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Tony1212

532 posts in 2853 days


#15 posted 06-08-2020 01:45 PM

I have a dado set that completely lost a couple of teeth. I assumed it was just a cheap dado set and the brazing wasn’t up to par. I no longer cut dadoes on my table saw – I use my router for that, so I’m not too upset.

-- Tony, SW Chicago Suburbs

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