Burning the Wood - Router Forums
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post #1 of 13 (permalink) Old 04-17-2016, 09:11 PM Thread Starter
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Default Burning the Wood

Earlier today, I rounded over the edges on a piece of walnut using a Bosch 1/4" roundover bit. Even though I kept the router moving, there were some burned spots. I guess I don't understand how a bit burns. The bit was brand new, so it was presumably sharp. When the bit comes into contact with the wood, why does it burn instead of just removing the wood, if that question makes any sense? Inquiring minds want to know.

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post #2 of 13 (permalink) Old 04-17-2016, 09:23 PM
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from the sound of your description uneven feed rate( you may have slowed down intermittently while cutting it) walnut, cherry are a few that burn easily.
I usually make two cuts after the first cut lower the blade slightly and make the final cut illuminating burns.
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post #3 of 13 (permalink) Old 04-17-2016, 09:25 PM Thread Starter
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From the sound of your description uneven feed rate (you may have slowed down intermittently while cutting it.) Walnut, cherry are a few that burn easily. I usually make two cuts after the first cut lower the blade slightly and make the final cut illuminating burns.
Dumb question, I know. Is the burning related to the amount of wood being removed?

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post #4 of 13 (permalink) Old 04-17-2016, 09:26 PM
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see if this helps...

what species are you routing....
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post #5 of 13 (permalink) Old 04-17-2016, 09:34 PM Thread Starter
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see if this helps...

what species are you routing....
I'm not sure. The wood was given to me, and I don't know how to tell it apart. It looks like walnut, but it's not quite as dark. Cherry? It's not exotic. He kept all of the exotic cutoffs.

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post #6 of 13 (permalink) Old 04-17-2016, 10:24 PM
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Mike
think of it this way like rubbing 2 sticks together to start a fire. some wood makes better kindling.
when you slow down the feed rate, the router bit continues to move at the same speed which causes friction against the wood, there is where the burns show up.
it is a problem that is really hard to eliminate the trick is to keep it down to a manageable situation
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post #7 of 13 (permalink) Old 04-17-2016, 10:32 PM Thread Starter
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Mike
think of it this way like rubbing 2 sticks together to start a fire. some wood makes better kindling.
when you slow down the feed rate, the router bit continues to move at the same speed which causes friction against the wood, there is where the burns show up.
it is a problem that is really hard to eliminate the trick is to keep it down to a manageable situation
John, I understand what you're saying and will heed that advice. What I don't understand is why there is friction between the bit and the wood. Once the bit turns 180 degrees, the wood that it comes into contact with is removed. What two surfaces are rubbing together to cause the heat? I guess it has to be the outside edge of the bit and the wood.

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post #8 of 13 (permalink) Old 04-17-2016, 10:56 PM
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John, I understand what you're saying and will heed that advice. What I don't understand is why there is friction between the bit and the wood. Once the bit turns 180 degrees, the wood that it comes into contact with is removed. What two surfaces are rubbing together to cause the heat? I guess it has to be the outside edge of the bit and the wood.
from elsewhere in the world of forums..

Some of the guys from the woodworking club took a tour of a production cabinet shop last week. Lots of commercial furniture for hotels, schools, etc.
One of the things the owner said was that when you are using router bits, you want "chips" to fly off, not "sawdust." Chips will carry off the heat, sawdust will not and causes the bits to overheat. I heard the same thing a few years ago from the Bosch engineers.
So, the old advice to run a profile with your router, then lower the bit 1/32 for the clean up pass is not the right way to do it.


http://www.routerforums.com/tools-wo...-folklore.html
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post #9 of 13 (permalink) Old 04-17-2016, 11:48 PM
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I bought a Bosch bit awhile back and wasn't too thrilled with it, and switched to Freud and been very happy with them they just seem sharper, I can tell by the resistance against the wood when I feed the material thru.

Just my unscientific observation.

Herb
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post #10 of 13 (permalink) Old 04-17-2016, 11:52 PM
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I bought a Bosch bit awhile back and wasn't too thrilled with it, and switched to Freud and been very happy with them they just seem sharper, I can tell by the resistance against the wood when I feed the material thru.

Just my unscientific observation.

Herb
agreed...
Bosch bits are so-so...
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This would have been the week that I'd have finished chewing thru the restraints...
If only new layers hadn't been added....

Stick....
Forget the primal scream, just ROAR!!!
"SNORK Mountain Congressional Library and Taxidermy”
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