OEM throat plate lifting during cutting - R4512

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Forum topic by joeIWD posted 01-28-2019 11:46 AM 334 views 0 times favorited 5 replies Add to Favorites Watch
View joeIWD's profile


4 posts in 185 days

01-28-2019 11:46 AM


I recently bought a new Ridgid R4512 and man am I happy with this machine. I upgraded from a porter cable job site saw. I noticed a potentially dangerous problem last night and after some searching I couldn’t find if anyone else has this problem.

When I turn the saw on, 1 out of 10 times, the throat plate pops up at the front, the side which meets the wood first. I quickly hit the kill switch; I had flashes of the throat plate catching the blade and flying across the shop.

Has anyone dealt with this issue before? I think it is due to a weak magnet, i.e. if I drive the leveling screws lower it stays put, but then it is slightly below the plane of the cast iron surface, >1/16”. Maybe I can swap out the magnets or upgrade to a Leecraft zero clearance plate.


5 replies so far

View bigblockyeti's profile


5746 posts in 2113 days

#1 posted 01-28-2019 12:36 PM

That does sound like a dangerous situation! I would certainly want the throat plate to be level with the top, or down only a few thousandths at the front as having the whole thing too low can create a safety hazard when cutting thin, short stock. I would be looking into an aftermarket solution such as the Leecraft you mentioned.

-- "Lack of effort will result in failure with amazing predictability" - Me

View BlasterStumps's profile


1308 posts in 832 days

#2 posted 01-28-2019 01:32 PM

There is a tang on the far end of the throat plate. Possibly it is bent upwards too much. That possibly is causing a lifting effect upon it being subjected to vibration. Also, make sure all corners and the middle is level with the table. I would readjust the screws and then make sure that the tang is just touching not sprung because the leveling screws are too high. hope that makes sense.

-- "I build for function first, looks second. Most times I never get around to looks." - Mike, western Colorado

View bondogaposis's profile


5414 posts in 2744 days

#3 posted 01-28-2019 01:49 PM

Sounds really dangerous, surely you could make your own zero clearance insert that would be safer.

-- Bondo Gaposis

View bilyo's profile


696 posts in 1495 days

#4 posted 01-28-2019 03:52 PM

I usually make my own throat plates either out of plywood or mdf with plastic laminate on top. They are held on with two screws threaded into the support tabs in the CI top. I have no experience with using magnets for this, but I don’t think I like the idea. Is this a popular and effective method?

View bigJohninvegas's profile


612 posts in 1855 days

#5 posted 01-29-2019 12:28 AM

I have a r4512, and use the Lee Craft plates.
They work great,
You will need the Rg-5 for zero plates, and the Rg-6 for dado.
Once you set the saw up for the lee craft plate, the factory plate will no longer fit properly.
Not wanting to re adjust my saw all the time. I bought an extra Rg-6 and set my router table up to cut it to match the factory plate.
Worked out perfectly.

-- John

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