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Tool Talk Discussion Forum

Table Saw Draws too Much Juice

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fergienewbee

11-25-2013 06:23:58
99.109.126.107



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I have A 10" contractor's table saw that starts and runs great when it's warm. When it get cold, like now, the motor turns slow and eventually will trip the breaker. The saw is the only thing running. Is there away to check the motor?

Larry




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Ellis Kinney

11-26-2013 10:15:39
74.139.97.108



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 Re: Table Saw Draws too Much Juice in reply to fergienewbee, 11-25-2013 06:23:58  
Frozen grease in the bearings?



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showcrop

11-26-2013 05:09:33
75.67.231.80



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 Re: Table Saw Draws too Much Juice in reply to fergienewbee, 11-25-2013 06:23:58  
My table saw always started very hard in the winter when it was out in the barn. Since I moved it into the basement it has always started well. I always assumed that it was the belt being stiff with cold. I would turn it around a few times to get the belt softened and then it would start OK.



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VernMI

11-25-2013 14:53:30
209.86.226.11



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 Re: Table Saw Draws too Much Juice in reply to fergienewbee, 11-25-2013 06:23:58  
Also if it is an open frame motor make sure to blow all the accumulated sawdust out of it.



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GUIDO

11-25-2013 12:54:57
71.168.250.97



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 Re: Table Saw Draws too Much Juice in reply to fergienewbee, 11-25-2013 06:23:58  

Hello fergienewbee,

Most likely cause is that the brushes are not making FULL com. contact. Here is a picture of the before and after. Take an Exacto knife or razor blade, and trim the leading and trailing edges of the brushes as shown. Also clean them and the com, including the slot between the segments, Make sure that the spring tension is letting the brushes make full contact,

Guido.

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John B.

11-26-2013 07:48:19
50.40.67.67



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 Re: Table Saw Draws too Much Juice in reply to GUIDO, 11-25-2013 12:54:57  
I doubt if his motor has brushes, it's most likely an induction motor.



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GUIDO

11-26-2013 14:56:45
71.168.250.97



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 Re: Table Saw Draws too Much Juice in reply to John B., 11-26-2013 07:48:19  
Hello John B,

Some induction motors do have brushes. I suggested to check the brushes as they are usually ignored. They do need maintenance,

Guido.



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Butch(OH)

11-25-2013 07:29:36
66.192.33.38



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 Re: Table Saw Draws too Much Juice in reply to fergienewbee, 11-25-2013 06:23:58  
Besides what Fawteen said a marginal power cord can cause that same ting to happen. Takes a lot more umph to pull cold grease up to speed.



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Fawteen

11-25-2013 06:47:05
72.65.121.18



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 Re: Table Saw Draws too Much Juice in reply to fergienewbee, 11-25-2013 06:23:58  
Two probable causes:

1. Bearings are dry or worn.

2. Centrifugal start switch is sticking. May or may not have one, it's a set of contacts with fly weights on it that keep the motor on the start winding until the speed flips the weights out and opens the contacts.

If you're confident in your ability, pull the motor off, clean it out good, check the bearings, and clean and lightly lube the centrifugal mechanism.

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George Marsh

11-25-2013 14:22:25
50.127.10.40



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 Re: Table Saw Draws too Much Juice in reply to Fawteen, 11-25-2013 06:47:05  
Fawteen,
Totally agree on both your points.

Adding a third point, if bearings or bushings are worn, the rotor will show scratches where it has rubbed against the stator. Look for scratches.
George



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36 coupe

11-25-2013 14:38:29
69.49.143.233



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 Re: Table Saw Draws too Much Juice in reply to George Marsh, 11-25-2013 14:22:25  
Fixed a ball bearing motor that was slow.Bearings were ok but it had drag marks on armature laminations.Chucked the armature in a lathe and found it out of round.A light cut fixed it.



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George Marsh

11-26-2013 04:43:30
50.127.10.40



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 Re: Table Saw Draws too Much Juice in reply to 36 coupe, 11-25-2013 14:38:29  
I've found the rotor out of round too. No one fixed things any more. Not many have lathes. They just chuck them and buy new. My lath is 65 years old and it still works.



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36 coupe

11-27-2013 11:47:10
72.55.253.170



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 Re: Table Saw Draws too Much Juice in reply to George Marsh, 11-26-2013 04:43:30  
My lathe dates to pre 1934.Its an Atlas with a Sears name on the switch box.Dad bought it for 25 bucks in the 50s.Sears used to sell metal lathes and all the tools to go with them.My lathe has a broken gear in the apron.I have a gear to replace it.There must be some old lathes sitting idle.There seems to be little interest in machine tools now.



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George Marsh

11-28-2013 11:54:53
50.127.10.40



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 Re: Table Saw Draws too Much Juice in reply to 36 coupe, 11-27-2013 11:47:10  
Mine is a 10 inch atlas, 3 ft bed. It's both a metal and wood lath. I don't use mine that much, but it real nice to have when you need to make something you can't buy.



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