Dado set for R4512

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Forum topic by dpwalker posted 06-30-2013 04:18 PM 1893 views 0 times favorited 8 replies Add to Favorites Watch
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273 posts in 3033 days

06-30-2013 04:18 PM

I bought a “cheapo” 8 dado set a while ago for my Ridgid R4512 & haven’t had a need to use it until now. The chipper blades are an extremely tight fit on the arbor. I have to sort of wiggle them into place although they seem tight enough to screw on. The outer blades fit just fine. My question is “is this normal”? I don’t want to tear up my threads on the arbor getting these blades on & off. The instructions say it fits a 5/8 arbor which is the size of the arbor on my saw. Any help would be great. Dean

-- You have not really lived until you do something for someone who can never repay you.

8 replies so far

View crank49's profile


4032 posts in 3172 days

#1 posted 06-30-2013 05:08 PM

I’d say that’s very normal for the crappy tolerance these saws are built to. I can’t even get the rear arbor washer off my arbor at all without a gear puller. And my dado set will not go on at all.

View Mark Shymanski's profile

Mark Shymanski

5623 posts in 3914 days

#2 posted 06-30-2013 07:32 PM

Weird, I was just fiddling with my dado set. I have the home depot freud 8” dado set. It worked fine on my old Craftsman contractor saw. I’ve since bought a General cabinet saw (which is great by the way) but the dado set no longer fit. The folks from Freud who saw my question here advised me that if the hole was out of spec they’d rectify the problem. I measured the holes and they were just a hair (in metric that’s just a titch:-) under the stated 5/8s. Now I had every intention of sending them back but to shorten a long story I never sent them back. I am finally able to get back in my shop (its not been a great year for shop time ) so I wanted to make some dadoes. Same problem, okay zip over to HD and buy a new set. Get ‘em home take off the crosscut blade and put on the first blade from the new dado set. It is too small. Okay take those blades back and look at the old ones. What I figure is happening is that because the dado sets are thicker they bind on the arbour if not 100% square to the arbour. So you can either be robot accurate or do something like just touch the inside of the arbour holes with some fine grit (220) emery cloth mounted on a dowel which you can spin the constricted blade around thus widening the hole that wee bit to let it slide on. Worked like a charm for me.

-- "Checking for square? What madness is this! The cabinet is square because I will it to be so!" Jeremy Greiner LJ Topic#20953 2011 Feb 2

View sikrap's profile


1121 posts in 3560 days

#3 posted 06-30-2013 07:55 PM

My dado set is also quite “snug” on the arbor and I’m always wiggling it to get the chippers/blades on and off. I think its supposed to be like that so the blades/chippers maintain height.

-- Dave, Colonie, NY

View Paul Stoops's profile

Paul Stoops

352 posts in 2762 days

#4 posted 07-01-2013 04:26 AM

You might also look to make sure there are no burrs on the edges of the holes. Any burrs would likely make it difficult to install the chippers.

-- Paul, Auburn, WA

View Woodmaster1's profile


1070 posts in 2788 days

#5 posted 07-01-2013 11:00 AM

I would say it is normal. I have an eight inch Freud dado set that is a snug fit on my Unisaw.

View Howie's profile


2656 posts in 3124 days

#6 posted 07-01-2013 11:50 AM

I had a set for my 3650 Ridgid that fit fine. Also bought a General cabinet saw and had the same problem you have. Barely would go on. I reamed the holes slightly.

-- Life is good.

View Bsmith's profile


330 posts in 2872 days

#7 posted 07-01-2013 05:34 PM

Mine were tight too until I realized the blades had a thin protective coating, lacquer or something, on them. Once that was removed they went on much better.

-- Bryan

View dpwalker's profile


273 posts in 3033 days

#8 posted 07-02-2013 02:16 AM

Thanks for the replies. I guess this type of fit is common. I will be heeding the advise & check for burrs, lacquer & what not.

-- You have not really lived until you do something for someone who can never repay you.

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