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Forum topic by Betsy posted 02-16-2014 09:29 PM 675 views 0 times favorited 10 replies Add to Favorites Watch
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Betsy

2914 posts in 2554 days


02-16-2014 09:29 PM

Okay, so my lack of mechanical know-how will be on full display again. My scroll saw has popped the fuse button. Ive pushed it back in and the machine comes on for a millisecond and pops again. On most things when the fuse pops, you push it back in and you go on your merry way. The electic outlet happens to be the only thing on the particular breaker so I know there is not an overload on the breaker (I’m actually pretty amazed I thought to check that!) The machine is proabably 10 years old and has set unused for probably 2 years in the unheated garage.

Any thoughts on what could be wrong?

Thanks in advance.

-- Like a bad penny, I keep coming back!


10 replies so far

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MalcolmLaurel

210 posts in 281 days


#1 posted 02-16-2014 09:46 PM

Unless saw is too big for the breaker (what size breaker, and how many amps does the saw draw?) you’ve got a short somewhere. First make sure it’s not in the line to the outlet by seeing if the breaker pops when the saw isn’t plugged in. If it doesn’t, try it with the saw plugged in but not turned on. If the breaker pops then the short’s in the cord, if not it’s somewhere inside the saw.

-- Malcolm Laurel - http://MalcolmLaurel.com https://www.etsy.com/shop/MalcolmLaurel

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lew

10036 posts in 2414 days


#2 posted 02-16-2014 10:53 PM

Betsy,
Try the saw on another circuit (one controlled by a different circuit breaker). Sometimes breakers get “weak”. Maybe the breaker is a GFI (keeps you from getting electrocuted) and there is a grounding problem.
Lew

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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scrollingmom

833 posts in 1122 days


#3 posted 02-17-2014 03:10 AM

I’m not sure where you live, but it something sits here for very long mud-dobers will build a nest in anything. The other thing is that there maybe some dust or dirt buildup and is creating an ark.

-- Kelly, Allen,KS

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HerbC

1168 posts in 1518 days


#4 posted 02-17-2014 05:50 AM

Betsy,

Assumption: you have a Dewalt DW788 scroll saw. If any other model this may not be applicable.

If I’m reading your description correctly, the “fuse button” that you say is “popping” is the overload protection fuse, located in a fuse holder in the right rear of the unit, under the motor. It should be a 3 amp fast blow fuse. If it’s blowing the motor is trying to draw more that 3 amps. Check the mechanical linkages and make sure everything moves freely and is not binding up. Also lubricate any points that normally need lubrication. Pull the brushes on the motor and check them for wear and to ensure they are not jammed. Make sure the motor shaft turns freely.

The fuse is “popping” instead of the circuit breaker in your panel tripping because the fuse is designed to protect the motor by opening the circuit when the current exceeds 3 amps. Your circuit breaker is designed to protect the circuit wiring between the outlet and the panel by opening the circuit when the current exceeds 15 amps (or 20 amps in some circuits)...

HTH

Be Careful!

Herb

-- Herb, Florida - Here's why I close most messages with "Be Careful!" http://lumberjocks.com/HerbC/blog/17090

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Betsy

2914 posts in 2554 days


#5 posted 02-17-2014 07:35 AM

The saw for sure does not pull more than the 20 amp breaker should be able to handle.I’ve plugged several other things into the outlet with no problem. I did a careful look at my cord and found no breaks, cuts or abasions and the plug itself is tight as is the connection to the unit.

I tried the saw on 3 adfitional outlets that I know are on different circuits, same thing happens.

Herb, I’ll start to give the machine a good cleaning and will dig out the manual to see about the brushes. Thanks for the help.

-- Like a bad penny, I keep coming back!

View Loren's profile

Loren

7580 posts in 2306 days


#6 posted 02-17-2014 09:01 AM

Dust maybe. Open the casing and clean it out with compressed
air if needed, or a little brush.

Modern low voltage electrical switches are pretty robust. I’ve
owned 50 or more machines and while I like the clean attitude
of “replace” as a pragmatic matter I find I can usually get
things going. You could have oxidized copper contacts.

Those saws have a variable speed thing and I think that
means a DC motor. That speed dial apparatus may be a
weak link in any motor control that has one.

-- http://lawoodworking.com

View Jim Finn's profile

Jim Finn

1678 posts in 1580 days


#7 posted 02-17-2014 01:20 PM

Check out the switch. DeWalt in known for switches that fail.

-- In God We Trust

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jerrells

851 posts in 1543 days


#8 posted 02-17-2014 01:52 PM

One last suggestion to add to the excellent ones above. See if you have a “scrollers club” near you. There are always very well trained persons in those clubs. Give it a try.

-- Just learning the craft my Lord and Savior Jesus Christ practiced.

View Betsy's profile

Betsy

2914 posts in 2554 days


#9 posted 02-18-2014 05:03 AM

Thanks for the suggestions. I’ve been so busy this week I’ve not had a chance to revisit the isdue except to check the breaker and the outlet itself. I’ll be spending time on this over the weekend when I can put more than a couple of minutes into it. I’ll let you all know how I make out.

Thanks again.

-- Like a bad penny, I keep coming back!

View WildmanJack's profile

WildmanJack

33 posts in 244 days


#10 posted 02-18-2014 11:42 PM

I have had the same problem but my 788 uses the old glass fuses. I found that it only popped the fuse when I used a foot pedal! Took the foot pedal off and the saw hasn’t stopped yet. Why??? I have no idea. The foot switch was just a simple micro switch By the way, I used the exact same foot switch on my Excalibur Scroll saw and it worked just like it was supposed to. Tried it on about 4 other tools and had no problem but man that 788 sure didn’t like it. I checked the micro switch with a volt meter and it didn’t have a short, took the saw to the local service center and they said there was nothing wrong with it. It’s still a mystery to me but now I don’t use a foot switch on the 788 anymore…
Jack

-- Just an old banjo player tryin my hand at woodworking.

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