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Bent BS ball bearing?

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Forum topic by djang000 posted 10-06-2014 04:22 PM 832 views 0 times favorited 11 replies Add to Favorites Watch
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djang000

67 posts in 1595 days


10-06-2014 04:22 PM

Topic tags/keywords: question band saw bearing

Hi all

I bought a couple of years ago a shop fox band saw (model W1706) that I mainly used so far for curve-cuts. I had yesterday to do a lot of resawing (mainly IPE, 3” high by 6’ long). After maybe 1.5 hours, I had to slow drastically the feeding rate. Not long after, I realize that the tracking was completely off. I shut down the BS, who stopped immediately (weird since it always takes a good minute before the blade stops). After a quick check, I found that the the one of the lower bearing (the right one) was spinning with great difficulty, with a lot of wobbling.

I guess I now have the change it (or all of them while I’m at it). So 2 questions for you guys:

1- How can something like that happen? Bad adjustment? Just bad luck with that bearing??
2- Not sure if anyone knows a bit about bearing, but from the manual, it’s a 608-2rs bearing. Are all bearing created equal? Can I just buy the cheapest one on ebay (which I doubt since you usually get what you pay for) or should I look for something special? Anybody ever upgraded their bearings?

Thanks
sam


11 replies so far

View waho6o9's profile

waho6o9

7172 posts in 2040 days


#1 posted 10-06-2014 04:36 PM

Seems like there’s different grades of bearings, 608 is the size
and different letters after that determine higher grades of bearings.

I googled 608 – 2rs images and found a lot of different bearings
for the 608

Personally I’d get a better set of bearings and change both.

View Bill White's profile

Bill White

4451 posts in 3423 days


#2 posted 10-06-2014 04:41 PM

Not all be your bearing(s) are created equally. Best bet for you is to locate a bearing supply house, take your bearing(s) to them, and ask for a replacement. Be sure that you get sealed bearings. That style will keep junk out of the bearings.
If you don’t have a local supplier, check on line for a supplier.
If you have to order, note the numbers on your existing bearings so you can give that to the potential supplier.
Bill

-- bill@magraphics.us

View TheFridge's profile

TheFridge

5765 posts in 949 days


#3 posted 10-06-2014 04:48 PM

Motion industries is the place I use. They can get any bearing in existence. Might have a different bearing place close to you.

-- Shooting down the walls of heartache. Bang bang. I am. The warrior.

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Dallas

3599 posts in 1950 days


#4 posted 10-06-2014 04:51 PM

Here’s a real deal for ya, http://www.amazon.com/608-2RS-Skateboard-Bearing-8x22x7-Sealed/dp/B0045F2NHO/ref=pd_sim_sbs_indust_1?ie=UTF8&refRID=1Y9CJN6BWZY23BTC1QNY

Those are nothing more or less than cheap skateboard bearings. I use to replace the ones on my son’s and his friends when he still rode them.

BTW, his skateboard cost around $30 at Walmart one Christmas in the 90’s.

I would seriously ask your bearing dealer, or real auto parts store to get to higher grade bearings with closer tolerances.

-- Improvise.... Adapt...... Overcome!

View Dutchy's profile

Dutchy

2015 posts in 1631 days


#5 posted 10-06-2014 04:58 PM

http://www.neita.nl/lagers/koyocat203e.pdf

-- My englisch is bad but how is your dutch?

View MrUnix's profile

MrUnix

4220 posts in 1662 days


#6 posted 10-06-2014 06:01 PM

No, all bearings are not created equal. However, guide bearings don’t need to be super high quality as they are not really acting as bearings, but guides. The 608-2RS is just a normal bearing with 2 rubber seals (one each side), and since guide bearings are considered disposable, it’s a good idea to keep a few extra on hand and replace them when they get too worn. As already mentioned, those bearings are common on skateboards, so you can usually find a set of 8 or more pretty cheap on e-bay, Amazon, etc.. which will give you some extras for the future. Upgrading to a better bearing won’t do anything for performance, so in this case, cheaper is generally better.

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View Paul Miller's profile

Paul Miller

33 posts in 2916 days


#7 posted 10-06-2014 06:19 PM

Just to clarify the numbers on your bearing:
608-2RS
6 = Bearing Series (6 is a single row deep groove ball bearing)
0 = Robustness of bearing (0 is extra light)
8 = Shaft Diameter (8 is 8 millimeters)
2RS means that the bearing is sealed on both sides (2 Rubber Seals)

View Dallas's profile

Dallas

3599 posts in 1950 days


#8 posted 10-06-2014 06:20 PM

MrUnix, I beg to differ on one point. While it is true that the rs bearings won’t add anything to perfomance, the longevity of the bearing will be increased and the labor time of changing them will be less just by moving up one grade of seal.
$16 for 8 bearings that need to be changed seems to be less of a deal to me than $8 for a really well sealed set of two bearings that are built to last for decades in this application.

-- Improvise.... Adapt...... Overcome!

View oltexasboy1's profile

oltexasboy1

240 posts in 1167 days


#9 posted 10-06-2014 06:45 PM

AS a retired heavy equipment mechanic, I must agree with Dallas ,when it comes to bearings ,cheaper is not better. You can opt for a RS or ZZ bearing that also has a double outside shielding against dirt. SKF or Fafnir make really good bearing , you do not a double row, radial ,aircraft bearing( overkill) but a good single row radial bearing with a double shield like a 608 ZZ should work well. As a general rule ,for obvious reasons a lower bearing will go bad first, those should always be a double shielded bearing.
Check out Grainger
http://www.grainger.com/

-- "The pursuit of perfection often yields excellence"

View MrUnix's profile

MrUnix

4220 posts in 1662 days


#10 posted 10-06-2014 06:49 PM

MrUnix, I beg to differ on one point. While it is true that the rs bearings won t add anything to perfomance, the longevity of the bearing will be increased and the labor time of changing them will be less just by moving up one grade of seal.

Hmmm.. I didn’t mention anything about the seals used (other than to point out that the “2RS’ bearing specified has two rubber seals, one on each side).

Cheers,
Brad

-- Brad in FL - To be old and wise, you must first be young and stupid

View djang000's profile

djang000

67 posts in 1595 days


#11 posted 10-06-2014 07:54 PM

Thanks all for your answers. I think I’ll go with the cheap route (found this lot http://www.ebay.ca/itm/lot-8-Skateboard-Sealed-Greased-Ball-Bearings-608-2RS-8mm-22mm-7mm-608RS-/191355207221?pt=LH_DefaultDomain_2&hash=item2c8da8be35&autorefresh=true) and change them as they worn out.

Still not sure why it bent in the first place though…

sam

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