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Ridgid R4512 Table Saw Motor Upgrade!

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Forum topic by DucatiMann posted 05-23-2018 06:38 PM 1314 views 0 times favorited 13 replies Add to Favorites Watch
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DucatiMann

5 posts in 1060 days


05-23-2018 06:38 PM

Topic tags/keywords: ridgid table saw upgrade

I am excited to post my first post in this forum to show something I have been working on for the past couple weeks. I picked up a used R4512 in great condition on craigslist for $25 with the exception of one issue. The motor was not working.

Now, I figured it would be a simple fix. Some capacitor or something that was blown, but after I started taking it apart, it was clear to me that the previous owner had already been in the motor. Once I took it apart, I found that part of the motor windings were black and so I took it to an electric motor shop. $600 to rewind the motor or buy a new one for $400.

Spending $400 on a motor seemed absurd, especially when you would be getting the same output and would have to come up with a way to mount it, which couldn’t be done with the original plate according to the company I went to.

Saving a few dollars here and there, I scrounged enough money together to buy a 3hp compressor motor (I know, don’t buy compressor motors for table saws etc etc.), from harbor freight for $120 after a 25% coupon. There will be a dust shield for the motor either way, and I am trying to keep things under budget. I hoped the bolts for each motor would be interchangeable, but they are not, so I started to look at option b.

Why not just mount the plate that goes on the original saw onto the face of the new motor? 3 tapped holes in the VERY soft RIDGID motor cover and a few more holes in the aluminum face plate bam, new motor that will work with the old table. This is a 220V motor, so you will need a setup for that, but there are other 2-3hp motors out there that are 110V that will work exactly the same.

I was a little nervous about the difference in weight, but that beefy screw that holds the motor to the frame isn’t going anywhere. I would love to make a video and show everyone how to do this, but I will need a donor motor as I already did mine. I know step by step instructions are useful, and I will post them when I have time.

More to come soon.


13 replies so far

View knotscott's profile

knotscott

8099 posts in 3457 days


#1 posted 05-23-2018 07:59 PM

You had my attention at “Ducati”! ;-)

Well done!

-- Happiness is like wetting your pants...everyone can see it, but only you can feel the warmth....

View WhyMe's profile

WhyMe

1034 posts in 1643 days


#2 posted 05-23-2018 08:47 PM

(I know, don t buy compressor motors for table saws etc etc.)- DucatiMann

You got that right. That’s an open vented motor that needs good ventalation and saw dust may kill it sooner than later. Keep us posted on it’s life.

View DucatiMann's profile

DucatiMann

5 posts in 1060 days


#3 posted 05-25-2018 02:13 PM


(I know, don t buy compressor motors for table saws etc etc.)- DucatiMann

You got that right. That s an open vented motor that needs good ventalation and saw dust may kill it sooner than later. Keep us posted on it s life.

- WhyMe

The Ridgid tablesaw that I had installed in my custom table also has an open motor. I think with regular cleaning/blowing out the dust from the motor will prevent it from ever being an issue. There will also be plenty of room to vent the motor as well.

Unfortunately, the motor does no fit in the stock cabinet, so I removed the side that the motor is on. Since this will be mounted in my custom table anyways, it doesn’t really matter if that cover is there or not. Ran some hardwood through her. The power on this saw compared to what I was using is incredible. I can’t wait to get her dialed in!

View TheFridge's profile

TheFridge

9856 posts in 1568 days


#4 posted 05-25-2018 02:43 PM

That’s a lot of motor for a contractor saw.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

View DucatiMann's profile

DucatiMann

5 posts in 1060 days


#5 posted 05-25-2018 02:49 PM



That’s a lot of motor for a contractor saw.

- TheFridge

Yes it is. If necessary, I’ll replace the arbor bearing, but for now, I have a 3HP table saw that I paid $150 for!

View MrUnix's profile

MrUnix

6845 posts in 2281 days


#6 posted 05-25-2018 02:54 PM

Yes it is. If necessary, I ll replace the arbor bearing, but for now, I have a 3HP table saw that I paid $150 for!
- DucatiMann

I would be worried about more than just the arbor bearings.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View DucatiMann's profile

DucatiMann

5 posts in 1060 days


#7 posted 05-25-2018 03:04 PM



Yes it is. If necessary, I ll replace the arbor bearing, but for now, I have a 3HP table saw that I paid $150 for!
- DucatiMann

I would be worried about more than just the arbor bearings.

Cheers,
Brad

- MrUnix

What else should I be watching out for? This will be mounted in a solid table with 3 3/4” sheets of plywood for the top.

View jonah's profile

jonah

1820 posts in 3380 days


#8 posted 05-25-2018 04:44 PM

Wait, so you’re not using the cast iron top?

You’re basically building your own table saw and using the trunnions from the R4512?

View DucatiMann's profile

DucatiMann

5 posts in 1060 days


#9 posted 05-25-2018 06:16 PM



Wait, so you re not using the cast iron top?

You re basically building your own table saw and using the trunnions from the R4512?

- jonah

No, I will definitely be using the cast iron top. it will be set in the table. As soon as it is done, I will attach a pic. This is replacing the contractor saw that was in the table originally, with the very light, inexpensive top that is no longer flat.

Here is the current setup. I had a very hard time getting things to work out with this saw. ( I bought it from someone on Craigslist.

View MrUnix's profile

MrUnix

6845 posts in 2281 days


#10 posted 05-25-2018 06:41 PM

What else should I be watching out for? This will be mounted in a solid table with 3 3/4” sheets of plywood for the top.
- DucatiMann

That saw was designed for a ~1hp motor, so it was never designed to handle triple the power… kind of like putting a V-8 in a Volkswagen Bug… yes, you can do it, but the drive train and suspension were never designed to handle that kind of power. It’s typically situations like that when stuff starts breaking.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

View toolie's profile

toolie

2138 posts in 2710 days


#11 posted 05-25-2018 08:11 PM



What else should I be watching out for? This will be mounted in a solid table with 3 3/4” sheets of plywood for the top.
- DucatiMann

......... It s typically situations like that when stuff starts breaking.

Cheers,
Brad

- MrUnix

or bending. if that new motor weighs enough, it could warp the CI top. In a failed attempt to suspend a gas grill outside the perimeter of my deck, I saw $X$s twist over time as the weight they supported is always accelerating towards the earth. it might not happen, but it could be something to watch over time.

-- there's a solution to every problem.......you just have to be willing to find it.

View TheFridge's profile

TheFridge

9856 posts in 1568 days


#12 posted 05-25-2018 08:32 PM



What else should I be watching out for? This will be mounted in a solid table with 3 3/4” sheets of plywood for the top.
- DucatiMann It s typically situations like that when stuff starts breaking.

Cheers,
Brad

- MrUnix

You have it ready to roll. Give it a go. I just wouldn’t be surprised if parts start warping and breaking from the extra stress.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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jonah

1820 posts in 3380 days


#13 posted 05-25-2018 10:25 PM

I’m not sure the bigger motor will hurt much of anything. So long as it doesn’t warp the cast iron top, that is. It doesn’t spin faster. There isn’t much extra torque on the arbor, since it’s just driving a pulley. Provided the aforementioned warping doesn’t happen, I think it’ll be fine.

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