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Carbide Insert Breaking

6/20/23       
Luke Member

I am running a weinig unimat gold 6 head moulder and I am having issues with some of my carbide inserts breaking. We have a custom head for 1/4" carbide slot cutters. (similar to tounge and groove for flooring) We run this cutter very often but today we had the entire set of knifes break 3 times within 1,000 LNFT. The material we are running is red oak and has very few knots. I am not able to find any type of metal that could have possibly come in contact with the knife. The only thoughts I have left is that we got a bad batch of carbide from our distributor. Let me know your thoughts and any possible causes. thanks in advance

6/21/23       #2: Carbide Insert Breaking ...
Bill Stanisci

Usually the simple answer is the best. Not to insult you but it the head on backwards? It would sound wrong but beyond bad inserts I am not sure what else could cause it.

6/21/23       #3: Carbide Insert Breaking ...
Tom Gardiner

Are there countersunk holes in the insert. I have heard that sometimes the countersink angles are different from one manufacturer to the next. That will cause breakage

6/22/23       #4: Carbide Insert Breaking ...
RichC

Cleanliness is paramount when you install inserts. About any kind of dust under the insert prevents it from sitting flat in the head. If it doesn't crack when torqued down, it can crack under machining loads.

6/23/23       #5: Carbide Insert Breaking ...
Dustin Orth

Another item to look at. If the head has a broke tip, you don't notice and you keep running, it can wear the surface the holds the tip. That creates a slight amount of gap right at the most critical point of supporting the carbide insert. Test it by getting a feeler gauge, insert new tips and slide the gauge between the knife and head right out at max diameter. If any gap is there, you found your problem. I actually replaced a flooring head just for this reason, but we run a ton of barnwood so wearing things out is multiplied.

6/23/23       #6: Carbide Insert Breaking ...
Luke Nagle Member

Thanks for the responses. I found an old set from a different batch and put those inserts in to test them out and ran another 14,000 feet without them breaking. It was the exact same set up so I just figured the culprit must’ve been a bad batch of carbide.

6/24/23       #7: Carbide Insert Breaking ...
Allen Chalifoux

Out of curiosity were the broken inserts from the OEM or 3rd party supplier?

6/29/23       #8: Carbide Insert Breaking ...
Luke Nagle Member

They are from a 3rd party


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