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Forum topic by Gerald Thompson posted 10-21-2018 12:07 PM 348 views 0 times favorited 9 replies Add to Favorites Watch
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Gerald Thompson

1105 posts in 2406 days


10-21-2018 12:07 PM

After having a blade come off of my Delta 14’’ BS the upper wheel had a grating sound when turned by hand and did not spin freely when spun by hand. I changed the bearings and installed new rubber tires to both wheels.
The upper wheel still has the same problem. I can finger tighten the nut and it will spin freely up to point when it becomes harder to finger turn the nut. It still has the same sound and becomes louder with increased tightening by wrench.
I have checked all around the housing and see no rub marks and the shaft has no apparent damage.
I wonder of i install a 1/2’’ blade and put it under tension if things will work? I am, at present at a loss of what is going on or what to do. I might add that the bearings went in with no problem and I remembered to install the spacer and the bearings are the same number as the originals.

Thank you.

-- Jerry


9 replies so far

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splintergroup

2341 posts in 1394 days


#1 posted 10-21-2018 02:25 PM

I’m not familiar with the Deltas, but you obviously have some metal on metal contact. I’d remove the top wheel and put some marker ink on the flat surface of the inner hub where it meets up with the spindle support. The ink will scratch/rub off where contact is being made.

The rubbing has to be coming from somewhere. Look very closely!

Perhaps the spindle has shifted such that the spacer is no longer keeping the wheel from contact?

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Gerald Thompson

1105 posts in 2406 days


#2 posted 10-21-2018 03:27 PM

I took a very close look and sure and behold there was a small bare spot @ 12 o’clock in relation to the hub. I went to the hardware store and bought another washer to add to the one present. The wheel spins effortlessly. The second washer that was present must have been ground up when the blade came off now it’s off to putting the blade on and tuning it according to Alex Snodgrass.

Thank you very much.

-- Jerry

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Andybb

1371 posts in 775 days


#3 posted 10-25-2018 06:47 PM

Take a closer look just to make sure. The upper wheel adjustment system is made with pot metal and will bend and fracture over time with use. Seen it happen twice. Jet, Delta, Harbor Freight and many others all use the same configuration. In picture 5 look at the hinge on the far right. If it’s bent like that it will cause the wheel to rub against the housing. Using another washer will seem to fix it but it will continue to bend and the problem will return. Ask me how I know. :-) Good news is the parts are readily available. Note the quote in the caption…”The weakest link in the bandsaw is the
top wheel hinge casting that supports the top wheel shaft”
The tension on the wheel at the top of the hinge is offset by the adjustment screw pushing on the bottom which bends the hinge.

-- Andy - Seattle USA

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MrUnix

7003 posts in 2370 days


#4 posted 10-25-2018 07:10 PM

I took a very close look and sure and behold there was a small bare spot @ 12 o clock in relation to the hub. I went to the hardware store and bought another washer to add to the one present. The wheel spins effortlessly. The second washer that was present must have been ground up when the blade came off now it s off to putting the blade on and tuning it according to Alex Snodgrass.
- Gerald Thompson

Gerald… what year is your saw? The reason I ask is that there should not be a washer on that upper wheel – although it is possible that a PO added it when swapping out bearings… The older machines used 87502 bearings, which have an extended inner race (which faces outwards when installed on the wheel). It is possible to replace them with the more common 6202 bearings, as they are the exact same width, bore and diameter but do not have the extended inner race – so to use them, you need to supply a washer to make up for the difference.

I’ve seen many times where people have taken those 87502 (and 87504 on the lower wheel) to a local supplier only to be given the wrong 6202 bearings as replacements. Then they wind up having problems like you describe, and can’t figure out why, since they are positive the ‘expert’ at the store gave them the right bearings ;-)

Cheers,
Brad

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

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Gerald Thompson

1105 posts in 2406 days


#5 posted 10-25-2018 07:50 PM

Thanks Andy. I got it up and running and resawing like a champ
.
One washer got ground up in the shaft that made the wheel spacing correct.
I put in new bearings and installed rubber tires.
Now my DeWalt 735 started screaming. I tore it down some but nothing. It is not working. I took it to a shop as I am done messing with WW machinery and cars for awhile.
The to top it off Photoshop updated and now all my actions that I so laboriously programmed are malfunctioning.
Tomorrow I have to replace a serpentine belt on a car. I hope this all fixes things for awhile and thanks for letting me cry the blues.

-- Jerry

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Gerald Thompson

1105 posts in 2406 days


#6 posted 10-25-2018 09:16 PM

Mr u. I got the 6202 bearing for the top. /the same as the ones that came with the saw. I left the bottom for another day.

-- Jerry

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MrUnix

7003 posts in 2370 days


#7 posted 10-25-2018 11:13 PM

Mr u. I got the 6202 bearing for the top. /the same as the ones that came with the saw. I left the bottom for another day.
- Gerald Thompson

That’s why I was curious of the year of the machine… early models used the 87502 bearings, and then Delta switched to using 6202’s sometime around 1974 (along with a different length spacer). Doesn’t really matter much now you have it working, but it is something to be aware of, particularly when/if you replace those lower bearings.

Cheers,
Brad

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

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Knockonit

469 posts in 374 days


#8 posted 10-25-2018 11:50 PM

mine has a thrust washer on shaft prior to mounting wheel, perhaps this may be issue

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Gerald Thompson

1105 posts in 2406 days


#9 posted 10-26-2018 12:12 AM

I think mine had two washers One I think got ground up. The wheel rubbed on a small place on the housing. Ace Hdw.had one that fit the bill and things are working great.
My next venture is to use my Carter blade tensioner to use 1/4’’ blade.

-- Jerry

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