Bit Broke: Bad bit or bad technique - Router Forums
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post #1 of 15 (permalink) Old 01-21-2009, 06:57 PM Thread Starter
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Thumbs down Bit Broke: Bad bit or bad technique

I was rabbeting a 1/4" groove, 1/4" deep across about 70 linear feet of baltic birch. About 3/4 of the way my bit just disappeared ! I checked it looked for the bit and saw that it sheared off at the base of the cutting head. I was so mystified that in a split second I looked down my front to see if there were any holes in me that were suddenly becoming red . I have yet to find the cutting head and only suppose that it was swallowed up by the vacuum.

So what happened? Was I pushing too hard, cutting too deep, not allowing the bit to cool between work pieces? Or was it a weak bit? I purchased this no-name set of 1/2" bits on ebay some time ago - long before I became aware of the better brands of router bits. I recall that the seller of the bits claimed they were made of "carbon steel", but I don't know any thing else about their quality.

I guess my real question is: would this have happened if I had been using a high-end bit, and, if so, what was I doing wrong?

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post #2 of 15 (permalink) Old 01-21-2009, 07:56 PM
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Possible you were pushing too hard. Was it a long bit? I never used Birch, is it worse than Oak? Also possible the bit just got hot and chunked, also possible the bit might have chucked in odd. If the bit ever fell and or hit something hard it could weaken the shaft.

I've had 3 1/4" shaft straight bits snap on me over the yrs. All happened in the table while plowing dados. One of them stuck in the project the rest dropped in to the chip removal area.

Junk can go wrong with expensive bits too, don't beat yourself up so much. I listen to the router when pushing wood, I think it helps.
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post #3 of 15 (permalink) Old 01-21-2009, 08:13 PM
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Hi Spokaneman

Not your error,so to speak,,many forget that a router bit is Not a saw blade,,the chips will get stuck in the slot and go around and around unlike a saw blade, a very long pass will heat the bit and anything that gets hot will expand just a little bit and jam in the slot but the real error comes from the chips get stuck in the slot...

Try using a slot cutter on long slots..it will save your bits..
The right tool for the right job thing comes into play...

========

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Originally Posted by Spokaneman View Post
I was rabbeting a 1/4" groove, 1/4" deep across about 70 linear feet of baltic birch. About 3/4 of the way my bit just disappeared ! I checked it looked for the bit and saw that it sheared off at the base of the cutting head. I was so mystified that in a split second I looked down my front to see if there were any holes in me that were suddenly becoming red . I have yet to find the cutting head and only suppose that it was swallowed up by the vacuum.

So what happened? Was I pushing too hard, cutting too deep, not allowing the bit to cool between work pieces? Or was it a weak bit? I purchased this no-name set of 1/2" bits on ebay some time ago - long before I became aware of the better brands of router bits. I recall that the seller of the bits claimed they were made of "carbon steel", but I don't know any thing else about their quality.

I guess my real question is: would this have happened if I had been using a high-end bit, and, if so, what was I doing wrong?



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Last edited by bobj3; 01-21-2009 at 08:25 PM.
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post #4 of 15 (permalink) Old 01-21-2009, 08:16 PM
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Try it with a slot cutter. Much more efficient.

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post #5 of 15 (permalink) Old 01-22-2009, 04:26 AM
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Giving it far too much 'Wellie' the same thing happened to me with my table router, broke all the fan blades.
Derek.
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post #6 of 15 (permalink) Old 01-22-2009, 03:44 PM
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Hi Derek

What " 'Wellie' ????

it that something you do with your finger ? putting your wet finger in some ones ear.. ?


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Giving it far too much 'Wellie' the same thing happened to me with my table router, broke all the fan blades.
Derek.



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Last edited by bobj3; 01-22-2009 at 03:52 PM.
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post #7 of 15 (permalink) Old 01-22-2009, 07:23 PM
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Hmmmm. I thought a wellie was what one makes in the mashed potatoes with the gravy spoon.

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post #8 of 15 (permalink) Old 01-22-2009, 07:26 PM
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Or the potholes in the mashed potato roads.

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post #9 of 15 (permalink) Old 01-22-2009, 10:24 PM
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Just remember, you have to be wellie, wellie good to make those roads.

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or by imbeciles who really mean it.

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post #10 of 15 (permalink) Old 01-23-2009, 01:56 AM
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Ok, now that everyone has made fun of what they did not understand lets get back to the question. I think the main reason your bit broke is because it was "carbon steel". The least expensive bits are usually HSS which is much harder. HSS bits cut steel just fine but when it comes to wood you need carbide if you want it to last. If you need to use a straight bit then the best choice would be a solid carbide spiral up cut bit. These bits do a better job at removing debris than straight bits. 70 feet is quite a long run and should be done in sections allowing the bit to cool. Remember that heat kills even the best bits available.

Derek, if you have not tried one the "Cyclone lids" that fit either 5 gallon buckets or garbage cans are a great safety device to protect your dust collector. Using one of these devices in line changes your system into a two stage which captures most of the dust and debris. No more broken fan blades and the cans are easier to empty than the bags.

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