motor problem in table saw

[robwolfzx]

Hello everyone,

I hope that you will be able to explain me the technical issue with my table saw. I use Dewalt. The motor that was mounted in it before is not functioning anymore. I brought the 3ph motor that I used on he farm and now I can not understand what connector I need to power the table saw. I don’t have 3p in a workshop.

Please help

 

[Timberframed]

A 3 phase coverter is in order if you employ that motor. Easier to keep it single phase. Blow the existing motor clean of dust and check motor leads and switch with a meter to isolate the problem. How old is the saw?

 

[robwolfzx]

A 3 phase coverter is in order if you employ that motor. Easier to keep it single phase. Blow the existing motor clean of dust and check motor leads and switch with a meter to isolate the problem. How old is the saw?

The saw was made in 2000. I bought it from one man on the Craigslist. I want to show you my current motor https://www.mrosupply.com/motors/ac-motors/general-purpose-motors/26523_vm3546_baldor/

Is it really possible to install it for the table saw?

 

[TPA]

Yes, far easier to stay with single phase. You can get 3 hp in single phase, should cost about 100-200. You may have to adapt the mount if it is not a standardized mount such as NEMA.

 

[ncpete]

If that is a dewalt jobsite saw, do not put a 3 hp motor on it, 3 hp will require a 220v connection to run properly, and the smaller chassis likely will run into some clearance issues. If it is the dewalt hybrid saw - and your shop is already wired for 220 single phase, a 3hp motor should fit without any clearance issues.

but, before we get into discussing replacement in depth, let's get an idea of what the failure actually is. did it burn out while running it? did you go back to the saw and just have it not turn on? Have you recently moved the saw, and had the cord get caught (there is an adapter to the cord that goes to the wall - it may have been pulled out) or cut? Really, way too many potential issues, with the limited amount of information you have shared so far, for us to just go wholesale into replacing the motor. I have run a cabinet shop and been a professional flooring installer, with some pro-grade - but not commercial production ready - equipment, and never "let the smoke out" of any of our equipment.

 

[BobL]

Most single phase motor problems on table saws are either dust in the switch or a blown start or run Capacitor.
The dust problem is easily fixed.

The start capacitor can be checked by
- unplug the motor from the AC
- remove the belt from the motor pulley
- reconnect the AC to the motor.
- spin the pulley by hand and then turn on the power to the motor - if it starts and runs, the start capacitor is faulty.
REPEAT "do not perform this test by spinning the blade!"

 

[ncpete]

and the caps are pretty cheap to replace, too. But, he hasn't mentioned having "let the smoke out" so I suspect it's not the caps. Switches - be where the trouble lies. And blow all the collected dust out of the motor.

 

[Mike Van]

His first post said it is a 3 phase motor and now wont run in his new shop which is just single phase. He's looking for a connector to make it work. I'd say that was the problem, as there are no capacitors in a three phase motor. To the OP rob - You need to buy either a new single phase motor [easy, provided its the same frame as the 3 phase one] or, a converter to make that 3 phase motor run on single phase. Search 3 phase converters on google, you'll see what you need.

 

[BobL]

and the caps are pretty cheap to replace, too. But, he hasn't mentioned having "let the smoke out" so I suspect it's not the caps. .

Caps can be faulty well before they let their smoke out

His first post said it is a 3 phase motor and now wont run in his new shop which is just single phase. He's looking for a connector to make it work.

I thought we already established that. If he want's to use 3 phase he could also consider using a VFD, but I was suggesting he revisit his old motor.

 

[blades]

VFD on a table saw would be over kill. A static converter would be all that is needed, less cost. Best solution already mentioned replace motor. A bit pricy for a 3hp single ph 220- need to look at rpm needed and of course amp draw vs available power. look around either on the net or local for used ones- some savings to be had that way. It would also help a great deal to know the particular saw in question. and you need to identify the motor frame type as well.

 

[Mike Van]

Depends on the motor style too, I don't know what the Dewalt is like, but if it's like the Unisaw, not just any motor is going to fit it.

 

[ncpete]

Depends on the motor style too, I don't know what the Dewalt is like, but if it's like the Unisaw, not just any motor is going to fit it.

right, and there aren't any recent DeWalt saws with a 3 phase motor as OE, so I think that the 3phase he is mentioning was what was intended to replace the failed motor?

 

[robwolfzx]

thanks everyone! I decided to order a single phase after holidays.
Happy New Year!