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Forum topic by robinwis posted 03-05-2018 02:54 PM 326 views 0 times favorited 6 replies Add to Favorites Watch
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robinwis

2 posts in 106 days


03-05-2018 02:54 PM

Topic tags/keywords: question

Should my table saw blade spin freely when not connected to the motor? I recently inherited an old, HEAVY, Delta table saw that belonged to my grand father. I want to restore it. One thing I noticed is that when I run it the blade stops turning right after I turn the power off. I took the belt off. While there is no slop in the arbor, it seems like it does not spin freely. I am thinking new bearings, but I figure I better check with someone that knows better. Thanks for any help.

Rob


6 replies so far

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smitdog

366 posts in 2128 days


#1 posted 03-05-2018 03:48 PM

If it is a belt driven saw and you’ve removed the belt then the blade should spin easily. Is there a lot of noise when it’s running? Belt driven saws are usually quiet other than the droning hum of the induction motor, and sometimes the spinning blade can whistle a little bit. If there are any high pitched squeals or screeching then it definitely has bad bearings. You can do it all yourself if you have the correct tools, like bearing pullers or a hydraulic press. I’m sure with a model number some folks here can give you specific bearing numbers to order. Or you could probably take the whole arbor into a motor repair shop to replace them for you.

-- Jarrett - Mount Vernon, Ohio

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Notbrick

37 posts in 132 days


#2 posted 03-05-2018 04:00 PM

I would also look into replacing the belts themselves. Could be very old and creating a heavy resistance for the motor. Check to see if they seem dry rot or very stiff. The link-belt have been become more popular for restorations because of their flexibility in length.

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jonah

1721 posts in 3321 days


#3 posted 03-05-2018 07:10 PM

If it doesn’t spin freely with no belt on it, you have a problem with the bearings or the arbor itself.

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MrUnix

6764 posts in 2222 days


#4 posted 03-05-2018 07:16 PM

Fresh bearings will not spin freely due to the resistance from the grease. Typically, if you hold a fresh bearing by its inner race and spin it by hand, you should get maybe one revolution and not much more. With a blade on it, you will get a bit more perhaps, but not much. On the other hand, if it does spin freely and for many revolutions, the bearing is toast and should be replaced asap. The only way to really determine the condition of a bearing is to pull the seal/shield and look.

Regardless – what you have is an old saw. You have no idea what kind of use/abuse it’s seen over the years, and no idea when or if the bearings have ever been changed. They do not last forever. It’s best to swap them out and be sure they are good rather than take your chances and hope they are. That will also give you the chance to examine the saw in greater detail and discover any other issues it may or may not have before any serious damage can be done. Cheap and easy insurance. Since you say you want to restore it, now is the time to do it.

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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robinwis

2 posts in 106 days


#5 posted 03-05-2018 07:21 PM

I removed the belt and the blade only turns a few revolutions. There is no marking on the saw other than the delta name. I did some digging on the internet and found a few parts diagrams that look like mine but have different part numbers for the arbor bearings. Because there is no slop I should be able to measure the shaft, race, and bearings so I can order replacements. My plan is to get it running again and build a table for it with a fence system. Any ideas for a DIY fence and table would be great. I want a table that is moble because space will be limited for a while

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MrUnix

6764 posts in 2222 days


#6 posted 03-05-2018 07:23 PM

Post a picture or three. Does it have a serial number?

Cheers,
Brad

-- Brad in FL - In Dog I trust... everything else is questionable

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