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Author Topic: When you hit a nail  (Read 938 times)

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Offline Pabene

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When you hit a nail
« on: January 09, 2018, 07:54:58 PM »
What happens when your log band saw blade, hit a nail in the log?
Sometimes it can be good to think about the proportion of the things as are going on. Here are some data I calculated many years ago.
At normal blade speed one tooth on the blade, is running 5-6 complete “laps” within one second.
At a feed of 30’/minute, 25 teeth will pass the distance to cross cut a 4” nail. If your feed is slower more teeth will be tuched.
If you have a “bimetal” blade, it is HSS steel in the blade tips and the nail is a normal “soft” steel nail, you will see blue small chips from the nail sitting on the tips on at least 20 teeth.
I have, in most cases, been able to clean the teeth from chips and then sharpen the blade. In some case I have been forced to check the set and perform an other sharpening. Then the blade has cut as normal.
There are nails made of harder steel. Such nails will destroy the blades, in my opinion.
No one can listen, hear the sound when the blade starts to cut the nail, stop the saw and save the blade that way. To cross cut a nail like this takes about 0.1 second.

Offline Percy

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Re: When you hit a nail
« Reply #1 on: January 09, 2018, 08:08:21 PM »
What happens when your log band saw blade, hit a nail in the log?
 

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Offline Lawg Dawg

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Re: When you hit a nail
« Reply #2 on: January 09, 2018, 08:10:37 PM »
What happens when your log band saw blade, hit a nail in the log?
Sometimes it can be good to think about the proportion of the things as are going on. Here are some data I calculated many years ago.
At normal blade speed one tooth on the blade, is running 5-6 complete “laps” within one second.
At a feed of 30’/minute, 25 teeth will pass the distance to cross cut a 4” nail. If your feed is slower more teeth will be tuched.
If you have a “bimetal” blade, it is HSS steel in the blade tips and the nail is a normal “soft” steel nail, you will see blue small chips from the nail sitting on the tips on at least 20 teeth.
I have, in most cases, been able to clean the teeth from chips and then sharpen the blade. In some case I have been forced to check the set and perform an other sharpening. Then the blade has cut as normal.
There are nails made of harder steel. Such nails will destroy the blades, in my opinion.
No one can listen, hear the sound when the blade starts to cut the nail, stop the saw and save the blade that way. To cross cut a nail like this takes about 0.1 second.

Yep, what he said..
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Offline bandmiller2

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Re: When you hit a nail
« Reply #3 on: January 09, 2018, 08:21:04 PM »
A lot depends on the angle you hit the nail. At right angle usually minor damage, check set and remove small curl of nail on the tooth tip. If you hit a nail at a low angle it will usually mess up the set on one side, band can usually be reset and sharpened. Drywall screws are pure poison to a band along with lag bolts and ceramic insulators. Frank C.
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Offline JB Griffin

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Re: When you hit a nail
« Reply #4 on: January 09, 2018, 08:29:51 PM »
Frank, your on to something right there.
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Offline Southside logger

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Re: When you hit a nail
« Reply #5 on: January 09, 2018, 10:37:20 PM »
Drywall screws are pure poison to a band along with lag bolts and ceramic insulators. Frank C.

Not to mention the dreaded ring shank nail and those dang backstops!!
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Online Cedarman

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Re: When you hit a nail
« Reply #6 on: January 10, 2018, 07:12:16 AM »
The only decision to be made when hitting a ceramic insulator is whether to take the blade to the junk blade pile now or later.
I am in the pink when sawing cedar.

Offline slider

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Re: When you hit a nail
« Reply #7 on: January 10, 2018, 07:27:03 AM »
Cedarman is 100% correct on that one.
al glenn

Offline ladylake

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Re: When you hit a nail
« Reply #8 on: January 11, 2018, 04:14:24 AM »
 

  2 of the worst I've hit , a ceramic insulator, sawed all the way through it , the blade was almost as smooth on the front as the back.  Later a pole bar nail a angle , every tooth was bent around in a U shape. I'd have thought they would have broke off before bending like that.  Steve
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Offline Sixacresand

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Re: When you hit a nail
« Reply #9 on: January 11, 2018, 08:38:04 AM »
The biggest concern is getting through the cut after hitting metal. 


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