HELP!!!!!

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elody21

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Dec 30, 2004
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Things like this always happen when my husband is out of town.
I have a Bosch 4000 table saw. I was using it and it started to rattle and make terrible noises!
It sounded like something had come loose so I unplugged it disconnected it from it's base and put it on the work table. I sprayed it out getting it dust free. There was nothing obviously loose. I plugged it in again and turned it on. Still the noise but now sparks from the motor!
Is my motor gone bad? It is only about 5 years old.
I guess I have to wait until my husband gets home. He is not going to be happy. He hates to have to fix this kind of stuff.
Anyway, I have the feeling it is something bad. How much does a new motor cost? I really like this saw. I only have a very limited amount of space and this ones fits perfectly.
I guess I just needed to vent.
Alice
 
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Alice it sounds that your motor is gone Capote. this happened to me on a table saw I Used to have and I ended up buying a new one. the sounds should be like grinding. If that's the sound then the bearing is gone bad and sometimes it cost too much to have it fixed.
 
OR, If you or your husband are handy around a tool box, you can crack the old motor open and take a look inside. You may be able to repair it fiarly easy and cheap.

Once the motor is out of the machine, try to twist the spindle. If it still turns, even if it turns really rough, it may be repairable, and it is suprisingly easy.

First, examine the spindle end of the motor, and remove any pulleys or other things from the spindle shaft. Then figure out how the end bell is held on. Most are screws or bolts, but there are some small motors that are just pressure fit. Remove the spindle end bell. If you can see burned or melted coils from here, then stop and throw it away. If not, then remove the spindle. It will have big magnets on it and be most of the weight of the motor. try very hard not to let it drag too much when pulling it out. You will eventually need to removethe other end bell as well, so before or after the spindle is up to you... pay close attention to any "wavy" washers and where they are at in the scheme of things. Anything like that will be close to the bearings on each end (if there is any at all).

Once you have the motor apart, carefully remove the bearings. They will probably be "pressed" onto each end of the spindle. Use a torch to heat them up and a hammer and drift to tap them off CAREFULLY so as not to booger up the spindle. Replace the bearings with matching numbers off of old bearings by heating them up in the oven. You want them pretty warm.. not glowing, but still hot enough to swell just a bit. Once they are warm enough, they will slide right on the shaft with no pressure at all. Careful they dont bottom out and bounce back a little bit when puttling them on, or the rebuild will be tougher. Once the bearing are on the spindle, clean and lube the end bells with some heavy grease, and put it all abck together!!!


New replacement motor- $200
New table saw-???????
New bearings- $10
The feeling of accomplishment when you brag that you rebuilt a motor- PRICELESS!


If you have any questions or anything, feel free to ask away!! I worked in a electric motor shop as a mechanic for a while, so i know a little bit about how to R,R,&R
 
Aaron,
I was writing at the same time as you
Thanks!!!
Alice





I was afraid of that! I have an old table saw that still works well. I keep it in the garage. Is it possible to replace the motor with one from another saw? How standard are the motors?
This is probably out there but I also have a motor from a 14" band saw. I replaced the one that came with it for a more powerful one. I don't suppose that would work?

Phillip, yes it sounded exactly like grinding!
I hope I don't have to take the present back my husband got for me yesterday. It is a Paslode cordless finish nail gun! I have never seen anything like it before. It has a fuel cell and a battery. My old cheap one died and next thing I knew he came home with this.
Anyway, if the motor can be replaced I will probably do that.
Thanks guys.
Alice
 
Aaron. My husband is very good at repairing electric things, he just doesn't enjoy it very much
I am printing out your directions. there was also a burning smell. I think I will at least take the motor out in the morning and check it over like you said. That way I will be at least a head of things when he gets home.
How come when something is broken it makes you want to use it all the more!
I'll let everyone know what happens.
thanks again
Alice
 
the other motor you have might work, it just has to be big enough to do the job, and mount properly.

If you need any more help, or have any other questions, Just let me know...


PS. I don't know if you are giving me a hard time, or being serious. Either way, it is pretty funny!!! (My name is Ron:biggrin:)
 
If you do have to replace the saw, there are some nice compact units available that are very good quality for not a lot of money. It would be nice to fix the motor but if you have to replace it, the saw replacement might be nearly as cheap as a motor. Good luck.

Wayne
 
Alice:
I don't know how far you are from Chicago, but I am sure there are electric motor rebuilders there.

If you have a Grainger near you, they likely know where to find the guy who rebuilds motors in his basement. The last motor I had rebuilt (4 or 5 years ago) cost me $50 by just such a guy.

If you really like the saw, it is worth the phone call.
 
I've just looked to see what type motor those machines have and I see that they use brushes, particularly sparks are a very good indicative of worn/damaged brushes and the grinding sound is common also.
You may be lucky and get away with a set of new brushes, there is if there is no other damage...???

I had recently and identical problem with one of my table-saws and that was my problem. It could have been resolved in 5 minutes if I had a set of new brushes but it took a week to get one of them to me...!:mad: Oh well...!

Good luck

Cheers
George
 
RAdams said:
New replacement motor- $200
New table saw-???????
New bearings- $10
The feeling of accomplishment when you brag that you rebuilt a motor- PRICELESS!
Click to expand...

Ron is correct. I have that saw and have had to repair it twice. In both cases it was making a terrible grinding sound and turned out to be a $5 bearing. It took about an hour to remove the motor from the saw and replace the bearing.

I would bet that the bearing has gone on your saw. It is a pretty easy fix.
 
Sorry "Aaron" Ron,
I am not sure where I got that. I had a long day!
My son, (Aaron) came down while I was writing the response. Maybe that is where it came from.?
I will check out everything everyone has to say. I am thinking of waiting until my husband gets home. He is really good with electronic things, I am just not very patient.
I just don't want to get in over my head. If it is just replacing the motor I can handle that.If it is repairing the motor, that makes me nervous. I can at least remove the motor and have that part done.
I very much appreciate all the suggestions.
I can't believe how things are made today. My dad had the same table saw all his life. When he died my brother-in-law took it and it still works! It is at least 50 years old!
My old and my first table saw is a cheap one . It is in the garage and it is still going strong.
I hate to sound like a "girl" but like cars, I just want my tools to work without trouble!
Alice


PS. I don't know if you are giving me a hard time, or being serious. Either way, it is pretty funny!!! (My name is Ron:biggrin:)[/QUOTE]
 
Actually, I figured out where you got that my name was Aaron... My signature. Tech N9ne's real name is Aaron Yates. My siggy used to say that until i realized it made it appear that my name was Aaron.
 
Ok, I know someone said to check the brushes but I did not realize that I could get to them without removing the motor! Oh well. I learned a lot today. Both of the brushes are not only worn but are chipped. So I am hoping that is the only problem. How often does something like this happen? When I get the new ones should I get 2 extras to have on hand?
I know where I can send for them but I am going to try tomorrow and call around to see if anyone has them. I guess I need to check for Bosch service places?
I am sure hoping this is the only thing! In the mean time I guess I will start putting all of those screws back!
thanks Again Alice
 
Well,
I finally got my new carbon brushes in the mail and put them in. Guess what ? Yes, they were bad but,it is not only the brushes :( The motor is still sparking and making a terrible noise. I guess I have to take it to a service repair shop. Does nothing last anymore!!!!!!!!!!!!!
Alice
 
I got the motor completely apart. The damage is the bearing froze up on the end of the shaft which melted part of the motor housing and ruined the brushes. so all I need to do is go and get a wheel puller to get the bearing off.
The motor casing and bearing are ordered and hopefully when things get back together it will be good.
Thanks to everyone for all of you help and suggestions. I guess I will have a while to wait to see if all goes well.
thanks Alice
 
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