Freud SD206 Dado set

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  • capncarl
    replied
    Yep, doesn’t create a perfectly flat bottom, I looked at my Freud Box Joint set which is packaged and labeled exactly like this. My cutters are perfectly flat and
    do cut a nice square bottom. One thing I noticed was it advertised larger carbides so it can be resharpened. If you this is true with this dado they you could have them resharpened flat if you wanted a box or finger joint cutter.

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  • LCHIEN
    replied
    From the Freud-supplied images on Amazon, look closely at what they are calling a flat bottom... you can see the little grooves in the corner they are clearly referring to the other competitors' uneven bottom when they say flat bottom. Not completely square.
    Also note the splintering they are claiming to avoid with the bevel top side cutters.

    Click image for larger version

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    Last edited by LCHIEN; 09-15-2021, 02:33 AM.

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  • LCHIEN
    commented on 's reply
    but if you look at the blade geometry you know it can't.
    Does personal experience count?
    Advertising hype. Mostly flat bottom. The Titanic was mostly unsinkable.

  • capncarl
    replied
    On the photo of this blade the 3rd line of description says it cuts a true flat bottom groove.

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  • LCHIEN
    replied
    You can use a router bit called a dado clean out bit to truly flatten and square the corners of the bottom of a dado groove.

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    you would use the 31/64 to clean out a 1/2" dado whose bottom is less than 3/16th variation and the sides are perfectly clean.
    Unfortunately I don't see any for narrow grooves less than 1/2"

    I regularly use the #7684 in the router table for doing half laps that are 3/4" deep and 3.5" wide (2x4s) after quickly grooving a hair less than 3/4" deep with a regular saw blade. I use the TS to cut the edges carefully then make many parallel 50% cuts by eye. Break off the resulting fins with a screwdriver, (optionally) chisel off any big remnants and then finish with the dado clean out on the router table, zig zagging across the width.
    This is faster than putting in a 3/4" dado on the TS and making multiple passes. Surprisingly quick.

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    On this one I made the initial saw cut the exact depth which is why you look closely you can see striping of the ATB bevel edge cutter teeth. If I had made the saw cut 1/32nd less or .730" then you would have an astoundingly smooth clean bottom with the dado height set to 0.750"
    Attached Files
    Last edited by LCHIEN; 09-15-2021, 12:32 AM.

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  • Jim Frye
    replied
    Yes, the outer blades do leave small grooves at the bottom of the cut, but does help with squeeze out. I paid over $200 for my SD806 some 20 years ago, but it was worth it. The old BT3000 will hog any cut I've ever set up with this set. For exposed end cuts, I still use a router.

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  • LCHIEN
    replied
    NG, the outer blades in this set have a beveled tooth for making a splinterless cuts with little tear out to the edge of the dado. There's a specifically right and left outer blade they are NOT designed to be used singly.
    The inner chipper blades are flat tooth grind. From Freuds website: Click image for larger version  Name:	Freud SD206 blade geometry.JPG Views:	0 Size:	15.3 KB ID:	845360

    The resulting dado is flat and clean across the width but there will be a little tiny bats ears gutter at the outside bottom of the cut due to the outer bevels.

    Read my posts in this thread: https://www.sawdustzone.org/forum/di...-saw-or-router

    They do sell a perfectly flat bottom dado set for box joints as I noted in that thread (I have a set, too)

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    But SD206 are a great dado set. Ideal for the BT3x. Not 8" dado but will still cut a 1.5" deep dado slot. I don't think I've ever needed one deeper than that. Pretty scary doing that!
    Last edited by LCHIEN; 09-14-2021, 11:27 PM.

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  • nicer20
    started a topic Freud SD206 Dado set

    Freud SD206 Dado set

    Found this for $63.85 on Amazon with free delivery for Prime. Down from regular $84 price.

    https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1

    I don't have a blade with FTG either - so thinking if this could be good for box joints, tenons, lap joints etc. (of course with proper jigs).

    I believe this is a recommended set as per BT3 FAQ (page 45).
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