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Angled cut saw blade deflection?

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Forum topic by MarkCh posted 05-13-2022 01:51 AM 430 views 0 times favorited 9 replies Add to Favorites Watch
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MarkCh

147 posts in 721 days


05-13-2022 01:51 AM

I tried making my first angled cuts yesterday. I used brackets on a plywood sled to cut an angle off square stock. Picture a single use taper cutting jig. The cut begins on the thick part next to my finger, and ends with the thin taper. The line of each cut is at a bit of an angle, emphasized by the angle of my finger. I’m thinking it’s deflection of the blade: thin kerf blade on a DeWalt table saw. Any suggestions?


9 replies so far

View sunnybob's profile

sunnybob

152 posts in 259 days


#1 posted 05-13-2022 03:38 AM

The most likely cause of inconsistent results is operator error. To get repeatable angled cuts like that you have to make sure that you have each piece of wood identical. Check the worst angled piece and make sure that each side is EXACTLY 90 degrees to the other three. One degree out of 90 will angle the cut

Also, if you are new to the hobby, dont push the wood through too fast. This can make the wood, and even the blade, flex a little. This is a very big problem on bandsaws.
If you are learning from utube understand that many of those videos speed up the cut rate because its boring to watch. If you push too slowly the wood will show scorch marks, too quickly and you might end up with what youre looking at.

-- my projects can be seen at www.pbase.com/sunnybob

View Madmark2's profile

Madmark2

3485 posts in 2082 days


#2 posted 05-13-2022 03:39 AM

Something is out of square. This is called a TAPER cut. If your jig isn’t perpendicular to the table you’ll get the results you’re seeing.

-- The hump with the stump and the pump!

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MarkCh

147 posts in 721 days


#3 posted 05-13-2022 04:12 AM

User error is highly likely. It was an awkward angle to hold snug via a push stick. Might screw a hold to the sled next time.

View Davevand's profile

Davevand

343 posts in 2330 days


#4 posted 05-13-2022 02:54 PM

Looks like the stock is moving during the cut plus a bit of blade defection

View Loren's profile

Loren

11550 posts in 5141 days


#5 posted 05-13-2022 10:22 PM

I’ve seen this effect when making neck joints for guitars. I correct it with a hand plane or a sanding board.

View AlanWS's profile

AlanWS

221 posts in 5052 days


#6 posted 05-13-2022 11:49 PM

You can check whether it’s blade deflection or stock that’s moved on your sled by making a second pass through the blade. If it was deflection, the blade will cut on the second pass. If there’s space between the stock and the blade, the stock has moved.

It’s also possible your blade is misaligned to not be parallel to the miter slot. That would tend to push stock so it moves. It’s not good.

-- Alan in Wisconsin

View bilyo's profile

bilyo

1563 posts in 2596 days


#7 posted 05-16-2022 10:31 PM

I think we could give you more precise answers if we could see a photo of the jig and how it works.

View MarkCh's profile

MarkCh

147 posts in 721 days


#8 posted 05-16-2022 10:53 PM

I agree it would help—it was just a piece of scrap plywood with stop blocks screwed in… that turned out to be a piece of plywood that was not scrap that my gf was using and I had to disassemble (and apologize).

Will post a replica though.

View Eric's profile

Eric

5763 posts in 1367 days


#9 posted 05-17-2022 12:57 AM

I would check for square edge on stock and parallel fence to blade on the saw. If you are cutting tall pieces on an edge, it’s best to have a higher fence and yes a stop block at the rear. A simple fence to build is an “h” profile that fits over and straddles the saw fence.

-- Eric, building the dream. the "Loft"

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