Ridgid R4512 Riving Knife Question

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Forum topic by Furnitude posted 04-22-2014 07:13 PM 1620 views 0 times favorited 7 replies Add to Favorites Watch
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380 posts in 3683 days

04-22-2014 07:13 PM

Topic tags/keywords: ridgid r4512

Hey folks,
I’m realizing that the riving knife on my Ridgid R4512 kind of wobbles a bit even when it is locked in. I can’t remember if it is supposed to be a bit wobbly or if it should be rigid. There isn’t much effect. During a cut, the riving knife always ends up where it is supposed to be, but I just wanted to ask those who have the saw if yours is like mine.

-- Mitch, Also blog at

7 replies so far

View SCOTSMAN's profile


5849 posts in 3761 days

#1 posted 04-22-2014 07:31 PM

No wobble required ! In actual fact definitely not.You will need to figure out by process of elimination what’s causing it to be slack and take it from there. It needs to be tight and rigid,too.I see for the bigger more industrial saws that riving knives cost a small fortune to buy.I ended up spending an hour or so making my own from old circular saw blades that are blunt. I just drew out the basic shape with a felt marker ,and went to work slowly with a diamond blade on an angle grinder. Holding it for this part in a vice then removing and finishing with a bench grinder. it works great and is a good way of using old blades.A riving knife for my saw would cost around three hundred dollars or even more.If you can get one ! Mostly nowadays you need to buy a used one as they are not easy to come by,but not impossible I suspect. Alistair

-- excuse my typing as I have a form of parkinsons disease

View crank49's profile


4032 posts in 3147 days

#2 posted 04-22-2014 09:17 PM

Well the crappy design and workmanship in these saws requires the riving knife to be a little loose so it can wander around and find the kerf. If I tighten mine down (you have to remove the insert plate to get to the bolt) it does not line up with the blade and therefore causes binding.

View Gixxerjoe04's profile


850 posts in 1752 days

#3 posted 04-22-2014 09:49 PM

Well in my crappy ryobi, if the riving knife wasn’t all the way up where it was suppose to be, it was out of line and a pain in the butt. When i finally put it up like it’s suppose to be it’s a little wobbly but works every time now, so i vote for suppose to be wobbly because of the cheap design haha.

View lepelerin's profile


495 posts in 2501 days

#4 posted 04-23-2014 02:47 AM

no wobble on mine

View lab7654's profile


266 posts in 2423 days

#5 posted 04-23-2014 03:08 AM

Mine doesn’t wobble when it’s tightened down, and there’s a set screw to set it to be in line with the blade. I set it to be in line with the blade after cranking it down a hair to work around the well known misalignment. If you haven’t heard about what I’m talking about, search it here and you’ll be more than educated. I set up everything in reference to the blade after the slight down crank; fence, riving knife, miter gauge, sled, etc

-- Tristin King -- When in doubt, sand it.

View Bsmith's profile


330 posts in 2846 days

#6 posted 04-23-2014 11:59 AM

No wobble on mine and shouldn’t be any.

-- Bryan

View TravisH's profile


624 posts in 2111 days

#7 posted 04-23-2014 12:01 PM

Mine doesn’t wobble at all, rock solid.

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