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Another R4512 blade shift story with (maybe) a happy ending

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Forum topic by Bigriverman posted 01-18-2014 09:55 AM 3377 views 4 times favorited 14 replies Add to Favorites Watch
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Bigriverman

15 posts in 1105 days


01-18-2014 09:55 AM

Topic tags/keywords: r4512

So fellas, you know the drill. Move the hand wheel and the back of the blade shifts. Back off a little and it moves back. I knew it moved some when I adjusted the height but never knew how much till I got a dial indicator and realized it was just too much. I would never be able to accurately align my saw. I took the back off of the saw, got a flashlight and asked my better half to man the hand wheel. After about an hour of up and downs I noticed a machined guide on the main trunnion. Right next to that is the worm wheel which is attached to the motor and rides on the height adjustment screw. Some more looking and I notice a gap between the two. It’s not a linear gap either. .050” at one end and .020 at the other. When you raise the blade the worm wheel wants to move toward the guide. So now the plan is to pull the motor (no way to reach the worm wheel from inside) and shim out the worm gear so it contacts the main trunnion guide and hopefully fix my problem Luckily I’ve got a three day week-end. Wish me luck guys. I’ll report back as soon as I’m done.


14 replies so far

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Bigriverman

15 posts in 1105 days


#1 posted 01-21-2014 12:54 AM

Success.

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jonah

687 posts in 2758 days


#2 posted 01-21-2014 01:37 AM

Well done! Nice to know its a simple fix. As for why Ridgid hasn’t recalled the saws for this fix… Who knows.

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BOOM_TOWN

19 posts in 1286 days


#3 posted 02-17-2014 03:33 AM

still working for you?

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Bigriverman

15 posts in 1105 days


#4 posted 02-17-2014 03:37 PM

Like a charm.

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Todd

384 posts in 1136 days


#5 posted 02-17-2014 03:51 PM

I don’t suppose you took any pics?

-- Todd, Huntsville, AL

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Bigriverman

15 posts in 1105 days


#6 posted 02-17-2014 05:07 PM

Sorry Todd, cell phone cam sucks. Pretty simple fix once you get the saw upside down and the legs off. Just need some feeler gauges and some shim stock. I used soda cans for my shim stock. I measured the clearance between the main trunnion guide and the ring gear at each attaching bolt, three in total. Then I removed the motor and shimmed out the ring gear. Took a few tries to get it right but now very little movement. I’ve found that when you raise and lower the blade it still moves a little but if you back off the handwheel to remove the torque from the ring gear it settles right back.

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Todd

384 posts in 1136 days


#7 posted 02-17-2014 06:28 PM

No prob. I’m in the middle of a project in my shop but I may try this in between projects. Thanks for the info!

-- Todd, Huntsville, AL

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BOOM_TOWN

19 posts in 1286 days


#8 posted 02-23-2014 01:54 PM

Trying to avoid having to flip the saw upside down, I just shimmed it with a piece of wood. The movement is basically negligible when measured with a dial indicator. Unfortunately the shim falls off when the blade is lowered all the way.

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carver1942

93 posts in 1163 days


#9 posted 02-23-2014 03:00 PM

I bought the R4512 to build kitchen cabinets. I’m caught between a rock and a hard place because I don’t have time to try and get Ridgid to service it, or do the fix shown here. It will be a pain checking the accuracy of the cut each time I change blade height. I found that if I always end a height adjustment in the same direction, it repeats fairly good, but I have no way of knowing if it’s not changing during a cut. With the gap between the trunnion and the ring gear, I’m hoping the the blade is not shifting from side to side the amount of the gap as a cut is being made. If I can get my cabinets done I will contact Ridgid for a replacement or refund. I registered this saw and supposedly it carries a lifetime warranty. I intend to take every legal means to get a replacement or refund. Ridged should have a recall on this saw as the condition that exists on many of these saws can be dangerous and cause kickbacks as the blade becomes out of parallel with the fence. I read on another forum that Ridgid is no longer making this saw. In studying the parts blowup of this saw and the Sears model of this saw, the construction of the ring gear and trunnion appears to be different. The Sears saw is supposedly made by Ridgid. I have not heard of similar blade shift complaints about the Sears model. This saw is not a top of the line table saw, but it should operate correctly out of the box without my having to take the whole thing apart and doing a repair that might or might not work. If Ridgid monitors these, and other woodworking forums like manufacturers do, it’s time for them to step up to the plate and correct an obvious problem and do a recall. Other than the blade shift problem it’s a great saw.
regards Ed

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crank49

3980 posts in 2430 days


#10 posted 02-25-2014 05:13 PM

Carver, I don’t know where you get your info, but I believe you are incorrect in relation to the Craftsman version of this saw.
I say this because I have one, and have had it almost 5 years.
Craftsman sold this saw before Ridgid started selling them.

My saw has the alignment issue and has had it from day one; it is not something that developed over time.

The way this happened is Ridgid quit selling the 4511, granite top saw.
Then Sears started selling the 21833 saw.
Then Ridgid started selling the 4512.

This all took place over the course of one year; I believe it was from the Fall of 2007 to the Fall of 2008.

Also, there are more than one issue with the alignment.
Most of these saws shift the blade to one side when you raise the blade.
Then when you back off the height just a tad the blade comes back into alignment.
I could live with that problem.

But, on my saw, and many others, both Craftsman and Ridgid, when you back off the height adjuster the blade does not come back into alignment with the miter slot. It’s completely random; every time you change the blade height the the alignment changes. It’s like a box of chocolates, you never know what you’re gonna get.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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carver1942

93 posts in 1163 days


#11 posted 02-25-2014 10:11 PM

Thanks for the clarification Michael. As you say, I did notice that if I end an adjustment in the same direction all the time the blade appears to maintain location. In your experience in using the saw, does the blade drift while making a cut? In other words, If I rip a piece 2” wide will it be accurate to 2” it’s entire length. Are you getting a surface that will provide for a good glue joint. You’re probably asking why don’t I make a cut and find out. I’m in the process of tooling up to build kitchen cabinets, and getting all my equipment together. I live in Connecticut and have only a carport to work in and the weather has been horrible. My tools and machines are housed in cabinets in the carport. As soon as the weather breaks I will begin working and will need the table saw. Do you think this saw will give me the results that I need for cabinet work, or should i contact Ridgid and attempt to get a replacement trunnion? Can I live with this shift. Since you have been using this saw for awhile your opinion will be very much appreciated.
regards
Ed
PS, as I’ve said I do like the saw.

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crank49

3980 posts in 2430 days


#12 posted 02-25-2014 10:26 PM

If you have one that works correctly they are nice saws.
They are greats machines for the price.
If you get one with the twisty alignment issue, then not so great.
I have never had an issue with blade drift (runout).
If is winds up .030” out of alignment with the miter slot after a height adjustment, that’s where is will be until I change the height again.

-- Michael: Hillary has a long list of accomplishments, though most DAs would refer to them as felonies.

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carver1942

93 posts in 1163 days


#13 posted 02-26-2014 12:09 AM

Thank you Michael. I emailed Ridgid customer service and asked if I was eligible to receive a replacement trunnion. I am waiting for their reply. If they decide to send me one I will replace it as soon as the weather permits me to and report the results here on LJ’s.
regards Ed

View lepelerin's profile

lepelerin

475 posts in 1784 days


#14 posted 03-05-2014 04:48 AM

When you adjust the height of the blade, do you keep the lock knob from the height adjustment wheel loose.
I noticed from day 1 with my saw if I do not keep it loose the blade won’t be aligned. If I tighten it up the blade is aligned. Works for me all the time.
I regularly check with a dial indicator and I am usually dead on or have a 0.001”, 0.002” which is good enough with me.

PS: Maybe I was lucky enough and got a saw with no alignment problem.

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