Up Spiral 3/8″ Freud Router bit
A brand new Freud 3/8 router bit just exploded on me. RPM approx 20k. Going into 9/16 of Ash. No knots, no nails etc. I called Freud and they asked me to ruturn it for them to see what the matter was. In the meantime, wanting to get on with the job, I purchased another one – thinking that last one must have been a fluke. I used a piece of Alder to get the depth set right, and to test the cut. To my horror it exploded again. Using a Porter Cable 890 plunge router. Bit tightly chucked. Anyone know why this could be happening – other that a problem with the bit?
I use Onsrud 1/4" upcut bits
I use Onsrud 1/4" upcut bits on my cnc and have a few bits break. Perhaps you were going too deep. I would try going .2-.25" depth first to make sure you are getting god chip ejection. I run mine at 60 inches per minute at 14k rpm at .25" depth.
Also, where did it break? I used after market collets which made a very big difference in my 892 router.
I would say make a shallower cut.
Hard to say
Assuming your depth of cut was reasonable, I would guess faulty carbide in both bits. If you bought from the same source, the second bit was likely from the same batch.
You are trying to cut solid wood-- a tough,resiliant material--with a small cutter made of brittle solid carbide in a hand held tool which is not ridgidly controlled enough to prevent vibration. The cutter can't handle being knocked around like that. Try a cutter with a steel shank and carbide tips. The filter is blocking a more detailed response.
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