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[email protected] (Eric Anderson)

05/02/2004 4:49 PM

Dados with negative and positive tooth angle

I have a Freud 508 stacked Dado. It had a high recommendation and did
do a good job on some dados I did WITH the grain. I tried to use it
on some oak cross grain and had some pretty bad tearout. The response
I got was to use a dado with positive tooth angle. Well, I have a
Sears wobble dado with positive tooth angle that is about 25 years
old, but I was told that these had the problem of creating a very
uneven bottom cut on the dado. Thought I would try it anyhow. Lo and
behold, the bottom looked VERY good. After looking at the design, it
appears that the teeth angle to the outside on each side that wobbles
out. It SHOULD make a pretty square bottom and DOES. Also the
vibration does not seem to be any worse than the stacked dado.

Anyway, I would like the group's experience with and recommendations
of dados that do a good job on cross grain. Also would be interested
in comments on my experiences with my wobble dado. Am I observing a
fluke in my wobble or are there others out there that have had similar
experiences?


This topic has 3 replies

MD

Morris Dovey

in reply to [email protected] (Eric Anderson) on 05/02/2004 4:49 PM

05/02/2004 7:24 PM

Eric Anderson wrote:
> I have a Freud 508 stacked Dado. It had a high recommendation and did
> do a good job on some dados I did WITH the grain. I tried to use it
> on some oak cross grain and had some pretty bad tearout. The response
> I got was to use a dado with positive tooth angle. Well, I have a
> Sears wobble dado with positive tooth angle that is about 25 years
> old, but I was told that these had the problem of creating a very
> uneven bottom cut on the dado. Thought I would try it anyhow. Lo and
> behold, the bottom looked VERY good. After looking at the design, it
> appears that the teeth angle to the outside on each side that wobbles
> out. It SHOULD make a pretty square bottom and DOES. Also the
> vibration does not seem to be any worse than the stacked dado.
>
> Anyway, I would like the group's experience with and recommendations
> of dados that do a good job on cross grain. Also would be interested
> in comments on my experiences with my wobble dado. Am I observing a
> fluke in my wobble or are there others out there that have had similar
> experiences?

My Sears wobbler is about 32 years old. Cuts a clean
flat-bottomed dado (or close enough to flat that I can't see the
difference). I'm a happy camper.

--
Morris Dovey
West Des Moines, Iowa USA
C links at http://www.iedu.com/c
Read my lips: The apple doesn't fall far from the tree.

eE

[email protected] (Eric Anderson)

in reply to [email protected] (Eric Anderson) on 05/02/2004 4:49 PM

08/02/2004 6:15 AM

I just found, sometime in the last 6 months, that a dado with the
grain is a groove. Thanks for reminding me. That makes my problem
even more of a concern. The stacked dado is a 208M. I tried to
remember it from memory, and you can see the result. It is an 8"
selling at Home Depot for about $80 as I recall (probably can take
that with a grain of salt also). It got very good reviews in one of
the magazines.

Freud confirmed I would have tearout at the end of the cut, but not on
the surface of the board, which is true. The recommendation was to
use a sacrificial board at the end of the cut. I think a positive rake
angle on the wobble helps to keep that from happening. I remembered
that I was always pretty happy with my sears wobble, but the bad press
in the newsgroups and elsewhere led me to purchase the stacked dado.

B a r r y B u r k e J r . <[email protected]> wrote in message news:<[email protected]>...
> On 5 Feb 2004 16:49:01 -0800, [email protected] (Eric Anderson)
> wrote:
>
> >I have a Freud 508 stacked Dado. It had a high recommendation and did
> >do a good job on some dados I did WITH the grain.
>
> That's not a dado, that's a groove. <G>
>
> > I tried to use it
> >on some oak cross grain and had some pretty bad tearout.
>
> Freud should change the name from dado to groover, if they expect you
> to only use it with the grain.
>
> I have a Freud stack dado that works great, can't remember the model
> number. Are you sure something else isn't wrong?
>
> Barry

Ba

B a r r y B u r k e J r .

in reply to [email protected] (Eric Anderson) on 05/02/2004 4:49 PM

06/02/2004 3:04 AM

On 5 Feb 2004 16:49:01 -0800, [email protected] (Eric Anderson)
wrote:

>I have a Freud 508 stacked Dado. It had a high recommendation and did
>do a good job on some dados I did WITH the grain.

That's not a dado, that's a groove. <G>

> I tried to use it
>on some oak cross grain and had some pretty bad tearout.

Freud should change the name from dado to groover, if they expect you
to only use it with the grain.

I have a Freud stack dado that works great, can't remember the model
number. Are you sure something else isn't wrong?

Barry


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