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Dado Blade/Arbor Issue

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Forum topic by Ben posted 05-09-2019 01:30 AM 338 views 0 times favorited 7 replies Add to Favorites Watch
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Ben

442 posts in 3277 days


05-09-2019 01:30 AM

I have a relatively new Freud 8” Dado stack. Used it a few years ago on one small project where close tolerances were not required. But today I made a box joint jig and started playing with it.
One of the blades – the outermost/furthest out on the arbor, is cutting a bit higher than the others.
This is unusual because if it were an arbor issue you’d expect that side to be low, right?
It results in a stepped bottom of the cut and a poor joint.

I haven’t yet calipered anything to see what the issue is, but with my old Bosch jobsite saw, I wouldn’t be surprised if the arbor is out of whack somehow.

I read about people fixing this with JB weld, but my arbor is so short that almost half the dado stack (set up for 5/8” is actually on the threaded part of the arbor, so I can’t JB that.

Any suggestions off the bat here? Was hoping to dial this in tomorrow and finish a drawer project.

Many thanks.


7 replies so far

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ocean

164 posts in 1253 days


#1 posted 05-09-2019 01:44 AM

It may be that the part of dado sack that is on the threads are not sitting parallel (level) with the rest of the stack. I have never hear of any kind of blade (dado or any other) should be in contact the the threaded portion of the arbor. Is your nut fully thread on the arbor? If not I would say that is your problem. To many cutters in the dado pushing the stack pass the safe limit of the arbor length. Just my two cents.

-- Bob, FL Keys

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Ben

442 posts in 3277 days


#2 posted 05-09-2019 01:49 AM

Thanks.
Dang, it’s not even the whole stack on there. It’s set up to cut actually only 9/16.
Maybe I have to ditch that outer blade and just do a narrower finger, like 3/8.
There is a large sort of flared washer on the drive end of the arbor. Maybe I can eliminate that and shift the whole stack over. I’ll experiment tomorrow.

View WhyMe's profile

WhyMe

1160 posts in 1981 days


#3 posted 05-09-2019 06:51 PM

It may be that the part of dado sack that is on the threads are not sitting parallel (level) with the rest of the stack. I have never hear of any kind of blade (dado or any other) should be in contact the the threaded portion of the arbor. Is your nut fully thread on the arbor? If not I would say that is your problem. To many cutters in the dado pushing the stack pass the safe limit of the arbor length. Just my two cents.

- ocean

Really? My dato stack rides on the threads. The smooth shaft of my arbor is about 3/8” so the dado stack setup at 3/4” rides on 3/8” of the threads. This is why arbors have ACME threads with flat tops.

View Ocelot's profile

Ocelot

2273 posts in 3058 days


#4 posted 05-09-2019 09:05 PM

I would not leave off the outer blade. My Freud stack came with a warning about that. Mine sit on the threads too. Has this Dado stack been sharpened? It may be that not all are the same radius from arbor to tooth.

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Ben

442 posts in 3277 days


#5 posted 05-09-2019 09:59 PM

Thanks all.
I sorted it out, sort of.
I reduced it to a 1/2” stack and swapped my bell shaped washer for the flat washer. This put the whole stack onto the smooth part of the arbor, just barely. The cuts are now perfect. But it’s a bummer I won’t be able to go bigger than 1/2”. Ah well.
Thanks again.

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Aj2

2321 posts in 2218 days


#6 posted 05-09-2019 10:39 PM

You can always go bigger. Just have to get a cabinet saw naturally your going to find all the limitations to a portable saw.
The Bosch saws are good it’s just too easy to out grow them.

Good Luck

-- Aj

View Ben's profile

Ben

442 posts in 3277 days


#7 posted 05-09-2019 11:49 PM

Thanks man.
I also have a 16” Northfield #4 that has a weird size arbor. I haven’t ever had the need for a dado stack until now. Sure I can find one for it. But that saw is really scary. 5hp three phase. Just had an accident on it today in fact. A violent kickback that bruised the hell out of my thumb (through a glove) and groin.

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