On my band sawmill I have Browning bearings with set screws locking bearing to shaft.The set screws are hex drive cup point, they loosen after a days work or so. The hex is 1/8" allen drive & are tighten onto shaft very firmly, new set screws last longer but am hoping that I can find a better type of set screw. If the bearing turns on shaft it ruins the shaft(BTDT). Would I have better results with "Mil. Spec. Alloy Steel Cup-Point Set Screws " ? Bearings are mounted in a pillow block with a 1 1/8" shaft. The set screws that come with the bearing look to be Black-Oxide Alloy Steel fine thread. Thanks for your help.
- Thread starter Jack345
- Start date
Janicholson
Well-known Member
The set screws are likely intended to keep the bearing located, not absorb force, If they loosen it is likely because the bearing is loose on the shaft, and moving as it is loaded. Two solutions seem reasonable. use Locktite stud and bearing mount on the shaft (really clean and very dry to use it. with a full contact coating.
The second is to specify a cam collar bearing. these use a ring that cams the bearing tight to the shaft, then uses a set screw to hold the ring in place. Jim
The second is to specify a cam collar bearing. these use a ring that cams the bearing tight to the shaft, then uses a set screw to hold the ring in place. Jim
M-MAN
Well-known Member
- Location
- Bostic, NC
What you need is square head set screws. Any industrial supply house will have them. You will also need a heavy set screw wrench or an 8 point socket to tighten them with. A regular wrench will spread before you can get it really tight. Be aware these set screws are hardened!
Steve@Advance
Well-known Member
I suspect there is too much clearance between the bearing bore and the shaft.
The real fix will be a new shaft carefully fit to new bearings.
Or dismantle it, thoroughly clean the shaft and bearing, replace the bearing if in the budget with an eccentric locking collar bearing, and reassemble it with Locktite shaft locker retaining compound.
Even that may be an iffy fix, band saws are a demanding application, lots of force that has to be held true for reliable blade tracking.
The real fix will be a new shaft carefully fit to new bearings.
Or dismantle it, thoroughly clean the shaft and bearing, replace the bearing if in the budget with an eccentric locking collar bearing, and reassemble it with Locktite shaft locker retaining compound.
Even that may be an iffy fix, band saws are a demanding application, lots of force that has to be held true for reliable blade tracking.
Set screws need to be tightened 3 times to seat. that is tighten loosen tighten loosen tighten, You notice the difference each time you loosen it. I have traveled thousand of miles to tighten set screws that were not properly set at assembly lock nuts do not correct the problem.
Jim
Jim
Russ from MN
Well-known Member
- Location
- Bemidji MN
I agree with Steve, the shaft is worn, the bearing is too loose. If it's not more that a few thousands you could take it apart, clean it well, stake the shaft with a centerpunch. Then put some good Loctite on it and reassemble it, might work.
Steve@Advance
Well-known Member
Something else you can do, get the bearings and shaft in the exact position you need it to run, tighten the screws enough to mark the shaft, take it apart and dimple the shaft so the screws get a good bite, nothing can turn or move. Locktite the screws.
Just be careful, set screws can only handle so much torque before splitting. Very difficult to get out once that happens!
Just be careful, set screws can only handle so much torque before splitting. Very difficult to get out once that happens!
mtf
Member
- Location
- Bottom of the Bluegrass State
You are saying that your bearings have the set screws made on them? I have used this type before, but I have had much better luck with the bearings that have the separate locking collar with the set screws in the locking collar. The collar locks on the shaft and the set screws don't have to take as much of the load.
That is my experience on bucket elevators and conveyors.
That is my experience on bucket elevators and conveyors.
Sounds like maybe wrong application for set screw style bearing? What part of your bandmill is this on? There are a couple options that are better than set screws. Squeeze-loc comes to mind. Simple to install and ensure decent concentricity. Next best may be taper sleeve adaptor but if you could post pic or describe? If you are bent on staying with set screws I agree with one of the posts below about dimpling shaft and double setscrewing. Just watch you have deep enough threads to do this.
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Tom,
That certainly looks better than set screws, I have that type of lock on drive wheels & has never slipped or caused problems,I purchased this mill back in 1997 & have used off shelf parts supplied by dealer will take measurements to see if the squeezelock bearings will work on my mill. Thanks
That certainly looks better than set screws, I have that type of lock on drive wheels & has never slipped or caused problems,I purchased this mill back in 1997 & have used off shelf parts supplied by dealer will take measurements to see if the squeezelock bearings will work on my mill. Thanks
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