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Forum topic by jacton posted 04-29-2014 05:30 PM 602 views 0 times favorited 9 replies Add to Favorites Watch
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jacton

3 posts in 143 days


04-29-2014 05:30 PM

Topic tags/keywords: tablesaw motor

Hello

I just found this site and I’m hoping one of you kind people can help me diagnose an issue I’m having. I just purchased a used table saw. Here are the specs for it:

12” craftsman
Direct drive motor
240 volt

Now here’s the issue. When I turn it on it takes a minute to spin up to full speed. Once it’s full speed I feed a piece of 1/2” MDF through and if I push it through at a normal rate the blade slows down and acts if it’s going to come to a complete stop. It acts as if it isn’t getting full power.

Here’s what I’ve done to troubleshoot it so far:
1. used a volt meter to check the outlet it’s being plugged into, it’s getting 240v.
2. checked the reset button on the motor, after pushing it didn’t make a difference.

Does anyone have any other ideas? My next thought is to take the motor out and take it to a motor shop.

Thanks for any help you may provide.


9 replies so far

View thetinman's profile

thetinman

224 posts in 192 days


#1 posted 04-29-2014 06:15 PM

It souds electrical to me. You may have the voltage but it sounds like it’s not getting the current (Amps). Check all the connections. Check that you have the right size wiring for 220V and that they didn’t just rewire from 110V with the same wiring. Generally, check everything.

Good luck

-- Life is what happens to you while you are planning better things -Mark Twain

View dhazelton's profile

dhazelton

1186 posts in 951 days


#2 posted 04-29-2014 06:22 PM

What he said. Look at how many amps the motor requires and then look at the circuit breaker in your box to make sure it’s more than that. Just because your plug and receptacle mate up doesn’t mean the wiring is correct.

View EEngineer's profile

EEngineer

893 posts in 2267 days


#3 posted 04-29-2014 06:23 PM

Check the voltage under power. If the wiring is undersized, then the voltage will drop when motor is powered on. You might be seeing 240V no-load and far less than that when the motor is starting.

What is the model number of your Craftsman direct drive saw? I don’t know of any direct drive saws they make with 240V. That doesn’t mean they don’t exist, I just never heard of them. With the model # I could go looking for specs like starting current, etc.

-- "Find out what you cannot do and then go do it!"

View jacton's profile

jacton

3 posts in 143 days


#4 posted 04-29-2014 06:37 PM

Wow, thanks for the quick responses. I’ll check the wiring as you all suggested. The saw is probably 25 years old, which is why it’s direct drive/240. I can’t find a model number anywhere on the saw, but found info on the motor itself.

View crank49's profile

crank49

3434 posts in 1625 days


#5 posted 04-29-2014 07:50 PM

Is this a Radial Arm Saw? I know those were sometimes 240 volt direct drive saws. Those would be the only 240V, universal/series wound motor, saws I can think of and universal motors don’t have capacitors; which is significant for trouble shooting. They would also have brushes which might be the problem.

As EEngineer said before, you need to know what the amp draw is when starting and/or under load.

If this is a Radial Arm Saw here is link to a motor on Ebay,

http://www.ebay.com/itm/Sears-Craftsman-12-Table-Saw-Direct-Drive-Motor-with-Switch-/351059866379?pt=LH_DefaultDomain_0&hash=item51bccc730b

-- Michael :-{| “If you tell a big enough lie and tell it frequently enough, it will be believed.” ― A H

View buildingmonkey's profile

buildingmonkey

90 posts in 202 days


#6 posted 04-30-2014 01:02 AM

I had a 10” Craftsman Radial arm saw, bought it new, and it never did have much power. I could rip 3/4” boards, but forget trying to rip anything thicker. And it was slow, no matter how good the blade was. Best thing that happened, someone posted the website where they are buying back the motor and carriage, sent mine in and they paid the freight and sent me 100 bucks. Yahoo!

-- Jim from Kansas

View runswithscissors's profile

runswithscissors

950 posts in 679 days


#7 posted 04-30-2014 07:20 AM

A 7.0 amp 240v. motor should be about as powerful as a 14 amp 120v. motor. In other words, maybe 1.5 hp if you’re an optimist (not very powerful). And then you are running a 12” blade with that modest amount of power, which of course needs even more than it would with a smaller blade.

The motor plate does look like it’s on a radial arm saw, not a TS.

View JaySybrandy's profile

JaySybrandy

78 posts in 230 days


#8 posted 04-30-2014 07:39 AM

I would not have a clue I ask my dad and he had no clue I would ring the old owner

View jacton's profile

jacton

3 posts in 143 days


#9 posted 04-30-2014 01:10 PM

Thanks again for the info. It’s definitely NOT a radial arm saw, it’s a table saw. I plan to do some testing with it tonight under load as EEngineer suggested. I’ll let you guys know what I find.

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