Breaking two router bits in a row

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Forum topic by Wiley posted 09-14-2010 04:53 AM 1213 views 0 times favorited 1 reply Add to Favorites Watch
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71 posts in 3272 days

09-14-2010 04:53 AM

Topic tags/keywords: question router

I was doing a cut with an 1/8” spiral router bit when all of a sudden the cutting noise stops. I turn everything off, lift the workpiece away, and discover that the router bit has sheared in half about an inch into the cut. So I swear at it, get out my spare 1/8” spiral bit, get everything aligned again, and start the cut where I left off. about 1/16” of an inch later the brand new router bit shears in exactly the same way. I’ve made several dozens of boxes in exactly the same way and I’ve never had this happen before. Have I just discovered the one piece of quartersawn mahogany in the world that’s stronger than carbide? What could have caused this? I’d sort of like to know before I get my next router bit.

-- "When you lose the power to laugh, you lose the power to think straight" - Inherit the Wind

1 reply so far

View Peter Oxley's profile

Peter Oxley

1426 posts in 4115 days

#1 posted 09-14-2010 06:00 AM

I’ve had similar problems with bits 1/4” and under: I make a cut that is exactly like other cuts I’ve made before, but this time I break a bit or two. Each time I’ve traced the problem to run-out. If your collet or bit shank have anything on them, or if the bit is too far or not far enough into the collet, it can cause the bit to wobble just a little bit, and this can be enough to break a small diameter bit. If you’ve eliminated other possibilities (cut too deep, feed-rate too fast), you may need to do a really good cleaning of your collet.

Maybe someone else can suggest some other possible problems??

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