Motor upgrade for table saw?

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Forum topic by Shane posted 09-27-2015 12:52 AM 892 views 0 times favorited 12 replies Add to Favorites Watch
View Shane's profile


285 posts in 1230 days

09-27-2015 12:52 AM

Has anyone ever attempted to do this? I’ve seen 3-5hp motors for sale on Craigslist here and there and wondered if it would be feasible to swap it into my r4511 for more power.

Just curious, not seriously considering it

12 replies so far

View jonah's profile


687 posts in 2717 days

#1 posted 09-27-2015 12:57 AM

It’s possible to do if you can find a motor with the same frame. You also want to be sure the mount and such can support the extra weight (if there is any). You’d obviously need a different switch, or at the very least to rewire the current one.

View tomsteve's profile


392 posts in 638 days

#2 posted 09-27-2015 01:15 PM

im not very electrical motor savvy, but would rotation direction of motor need to be considered,too or is that changable?

View SirIrb's profile


1239 posts in 649 days

#3 posted 09-27-2015 01:42 PM

Verify rpm.
Verify same shaft size.
So the same pulley will fit.

Be ready to separate with a large chunk of cash for a reputable 3-5hp. A baldor 5 is about a grand, if I remember.

What do you want to put it on?

If you are setting aside motor cash why don’t you search CL for table saws, find one with a 3 or 5 he motor, buy that.

-- Don't blame me, I voted for no one.

View FancyShoes's profile


504 posts in 783 days

#4 posted 09-27-2015 02:14 PM

You would be better off trying to find a new table saw with the bigger motor. I sell a 4hp motor with the delta mounting brackets, but they are more than what i sell a used tablesaw for with a 3hp motor.

i dont think you could do a big motor like that on a ridgid contractor saw.

View Shane's profile


285 posts in 1230 days

#5 posted 09-27-2015 02:49 PM

Like I said I was just curious in case I stumbled upon a good deal. Not something I’m seriously considering

View TheFridge's profile


5676 posts in 905 days

#6 posted 09-27-2015 02:59 PM

It’s prob a 56 frame which is a common frame size.

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

View knotscott's profile


7145 posts in 2794 days

#7 posted 09-27-2015 03:36 PM

It’s been done…sometimes successfully for a while…sometimes not so successfully….we rarely hear followup 10 years down the road.

In most cases, the support structure isn’t design to handle the torque and/or weight of a more powerful motor. In this case, the trunnion system is more stout than that of an average contractor saw, so you might get away with it if all other parameters are taken into consideration.

Steel City used to offer a 3hp hybrid that used an earlier version of a very similar trunnion system (~ 8-10 years ago..the 35610 comes to mind…it used nearly the same trunnion as the 35601-35605, Cman 22124, etc), though it’s likely that it was beefed up in a few areas. I’m not sure how well the single serpentine style belt and single pulley will respond. Steel City offered an updated trunnion in the 35625, 35630, Cman 22116, R4511, etc….I haven’t researched it, but it’s possible that they offered some 3hp hybrid version of that style trunnion system. It wouldn’t hurt to research the trunnion structure of some of the former 3hp Steel City hybrids that have similar mechanisms.

22124/35601 trunnions:

35625/R4511/22116 trunnions:

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

View BurlyBob's profile


3456 posts in 1684 days

#8 posted 09-27-2015 04:38 PM

I vote for the table saw up grade instead just the motor.

View FancyShoes's profile


504 posts in 783 days

#9 posted 09-27-2015 05:24 PM

If you come across a great deal like $50, or $100 for a 3hp motor, in great shape, that fits your frame size, you should be easily upgradable. The wiring would be the same if the voltage is the same as the motor currently wired, or if you have a 110v motor, you upgrade to a 220v motor, you will need to do some rewirong, not that difficult. There are motors than can be 110/220.

Frame size will most likely have the same shaft size, shaft length can be a issue, as well as the mounting,

There is a jet 3 hp motor for $175 up in norther ohio, has been on craigslist for a while. It looks like a good motor.

View bigblockyeti's profile


3570 posts in 1139 days

#10 posted 09-27-2015 07:50 PM

The last time I was actively ordering from Baldor, I believe the most power you could get in a 56 frame motor was 3hp and it was only high speed (3450rpm) which you would need anyway. It would almost certainly weigh more, but it wouldn’t be a great deal more. You would have some wiring work to do as it would require 240V, the current would be close to the same so some of the factory wiring might not need to be replaced. Any thing more than 3hp is going to be larger and much heavier, not to say that it couldn’t be done, but it would be exponentially more difficult vs. a motor close to the size of what the factory has installed.

View runswithscissors's profile


2127 posts in 1444 days

#11 posted 09-28-2015 05:30 AM

Direction of rotation is reversible on some motors, not on others. The motor plate will tell you what you need to know. I bought one cheap a few years ago (240 v.), but the rotation was wrong for my application. A motor shop told me that no, the rotation could not be changed. I kept the motor thinking I might find a use for it. Not yet.

I doubt if a dual voltage motor is likely to be 3 hp. They are usually only 1.5 hp. Of course, some old time 110 v. motors drew more amps (I saw a 24 amp one on an old planer once).

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

View Jim Finn's profile

Jim Finn

2390 posts in 2341 days

#12 posted 09-28-2015 01:17 PM

A friend of mine, that does some cabinet work in his workshop/garage, installed a three HP motor on his saw that had a smaller motor and it works well for him. He had trouble with it throwing belts at start up though. He secured the motor better and now it works better.

-- "You may have your PHD but I have my GED and my DD 214"

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