dado blade problem,ragged cut, incorrect installation of the two blades? - Router Forums
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post #1 of 6 (permalink) Old 04-03-2014, 02:44 PM Thread Starter
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Default dado blade problem,ragged cut, incorrect installation of the two blades?

Am using Freud stacked dado set and to get 1/4 inch stub tenon I used just two trimmer blades, referred to as left and right though nothing on blades that says so. Both blade faces with rotation arrows say this side out but if I do that the rotation arrows don't go in the same direction and that can't be right can it? So I turned the first blade around but the cut on the end grain of my test piece is terribly ragged. What's up here?

I have spent so much time on this and all for two stub tenons that are each 6 inches long.

any ideas guys? Thanks
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post #2 of 6 (permalink) Old 04-03-2014, 04:34 PM
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Welcome to the forum, Brooks.

I believe the two outer blades should show direction.

Are you using the two outer cutters or two chippers (trimmers) ?

All the blades should be assembled so the the teeth are facing the front of the saw.

You can set the dado cutter wider than 1/4" and use a sacrificial fence. IMO, this will be more accurate.

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Last edited by jw2170; 04-03-2014 at 07:39 PM. Reason: correction
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post #3 of 6 (permalink) Old 04-03-2014, 05:00 PM
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Hello Brooks, really pleased to see you join the community, welcome to Router Forums!

Looking forward to your participation.
Filling out your profile to include (first name,tools and short bio is strictly (optional )but does help members to better relate to each other.
Thank You John
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post #4 of 6 (permalink) Old 04-03-2014, 05:24 PM
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Even if the directional markings were worn off or if you had either a left-tilt or right-tilt saw-- They all go with the rotation of your arbor... (more details below)

Look at the teeth. The cutting edge of the teeth and the hook of those teeth... The cutting edge faces into the direction of cut. There is a left and right outside blade. It does matter. The outside blades of the dado face the same direction as each other, with the teeth facing into the direction of the cut and the bat-ears (the highest point of the tip is all leaned out to one side) to the outsides of the stack. The flat topped chipper blades also lead with their cutting edges.

If you have the outside blades facing into the direction of cut, but have the blades in the wrong sides of the stack (bat-ears towards the inside), they will cut, but 2 thiings will happen that will degrade the cut. Since the highest part of the cut is towards the inside of the cut, the sides of the groove will not have as high a quality cut to it. You may even see "steps" down one side of the groove. Second is that the stack will want to wander fractionally as cuts, so if there is any backlash in your arbor, the cut will not be as straight as it could be. That is why Frued uses bat-eared dado stacks. Those bat-ears to the outside do help on saws that may have a bit of arbor bearing backlash.

If you turn any of those around and mistakenly use them opposite the direction of cut, it ends up beating the wood to death and dulling your blades... possibly even in breaking the carbide teeth tips.

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Last edited by MAFoElffen; 04-03-2014 at 06:07 PM.
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post #5 of 6 (permalink) Old 04-03-2014, 06:09 PM
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Welcome to the forum Brooks.

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Enjoy the knowledge of others that can be found within.

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post #6 of 6 (permalink) Old 04-03-2014, 07:43 PM
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I'm wondering if you have two lefts or two rights instead of a left and a right. You say that you are are putting the writing that says this side out on both sides and the arrows point opposite directions. That shouldn't be the case. Refer to Mike's post to determine if I'm correct. If I am you need to return the set.

Someone I consider a master woodworker once told me that a master woodworker is not someone who never makes mistakes. He is someone who is able to cover them up so that no one can tell.
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