Whats it called and how to stop doing it - Router Forums
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post #1 of 22 (permalink) Old 03-20-2015, 03:32 PM Thread Starter
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Default Whats it called and how to stop doing it

I don't know the term for this but it seems to happen to me frequently. I'd like to know how to prevent it.

When cutting a piece of wood, ply, osb whatever, with a skill saw, when I get almost to the end of the cut the piece breaks and one edge corner is broken out while the other has the stub still attached. It seems that when the leading edge of the blade gets to the end, the small piece that isn't cut yet by the trailing edge is what breaks off.

Now I surmise part of it could be due to an unsupported off-cut, which isn't always possible or if supported, maybe there is an issue with the support of each side not being level with each other... or?

Before I start cutting my SS I have to correct whatever it is I'm doing wrong as I don't have the extra material to waste.

Thanks Guys
Al
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post #2 of 22 (permalink) Old 03-20-2015, 03:56 PM
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Originally Posted by AzOwl View Post
Now I surmise part of it could be due to an unsupported off-cut, which isn't always possible or if supported, maybe there is an issue with the support of each side not being level with each other... or?

Before I start cutting my SS I have to correct whatever it is I'm doing wrong as I don't have the extra material to waste.

Thanks Guys
Al
correct...
so make a support system for the cut offs or live w/ the breakage...

heres a simple no nonsense way to do it...


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post #3 of 22 (permalink) Old 03-20-2015, 04:42 PM
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Yepper-dee...unsupported...

also...make sure you are not spreading the material while cutting...let the saw cut and when supported properly the blade will go through to the end...no nubbies.

Are you also sure the blade is good and sharp...? Keeping the blade at full speed until all the way through...? Not overextending your reach...?

Not sure if something else is going on...you mentioned the trailing edge of the blade...only the leading edge is doing the cutting so the trailing edge is doing nothing.

Keep the feed smooth and steady until the saw blade is completely past the cut...sometimes there's a tendency to "throw it" towards the very end. Make sure the trailing edge has left the cut, nice and smoothly, before releasing the trigger. Keep the saw nice and level as though there is still wood underneath it...

Good luck...
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post #4 of 22 (permalink) Old 03-20-2015, 05:24 PM
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Al; I'm sure you already knoe this but on the small chance it's never happened to you...
When youre cutting things like long lengths of framing lumber, especially the bigger stuff, and someone makes like they want to help by supporting the off cut end, watch out!
If they know what they're doing they'll just wait for the offcut to sag into their hands; if they don't know what they're doing they'll put upward pressure on their end. That'll cause a kickback as sure as Safeway sells little green apples! We're talking possible severed femoral artery here. I just don't let folks 'help'.
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post #5 of 22 (permalink) Old 03-20-2015, 05:42 PM
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I use a piece of 1 1/2" insulation foam board to lay the sheet on. It's supported the whole way.

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post #6 of 22 (permalink) Old 03-20-2015, 06:47 PM
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Quote:
Originally Posted by Gene Howe View Post
I use a piece of 1 1/2" insulation foam board to lay the sheet on. It's supported the whole way.
That's an interesting idea

I don’t always insulate , but when I do .
Ok ,I never insulate
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post #7 of 22 (permalink) Old 03-20-2015, 07:11 PM
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I use a piece of foam board insulation purchased at the big box store. I cut it in four pieces so I can handle it and store it. I put it under the plywood and set the saw to just barely cut through the wood into the insulation.

It also helps make a clean cut. A rip sled works good also. I use a track saw for hte cuts.
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post #8 of 22 (permalink) Old 03-20-2015, 08:41 PM
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I am a foam junkie I use small blocks everywhere. works great at the drill press Under saw cuts or to block up material for edge routing Sometimes I use it for test cuts for RT set ups

Learning is an exciting adventure
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post #9 of 22 (permalink) Old 03-20-2015, 08:52 PM Thread Starter
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I'm used to cutting off the side of a saw horse and am surprised I even had an idea what the cause was. I'll take more time to support the whole workpiece.
That foam trick is a good one.

I might be old but as you can tell, I am still green-wood. But I am learning a lot of good technique from you guys. For the rough construction framing and concrete form work I did in my younger days, it may not have been as important and I never learned the right ways. Now that I'm trying to do more precise work, I see there's a lot I don't know.

thanks again
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post #10 of 22 (permalink) Old 03-20-2015, 08:58 PM
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how do you guys put up w/ all those never get all of 'em little itty bitty static cling plug filters nodules of foam/styrene that get everywhere to include inside of your tools only to melt and cause who knows what kind of issues......
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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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