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Band Saw Problems
I know this is a tractor forum, but . . .
I am having a problem with my 20 year old Sears 12 inch band saw. The saw contains an upper and a lower wheel, which the saw blade passes over. On each of the wheels is rubber “tire” that fits in a groove of the wheel, and the saw blade rests on tire as the wheel as the saw operates. Two problems have recently developed, and they are probably related.
The rubber tire on the upper wheel tends to ride out of its groove and off the wheel in the direction of the operator (me). The blade remains on the tire, but the tire is certainly not centered on the wheel, and I am concerned the blade will slip of the tire when the saw is operating, with the potential for injury (me). Can I re-affix the rubber tire to the wheel using rubber cement (or somesuch adhesive), or should I just replace the tire and hope the problem disappears?
My second problem is that the shaft for the lower wheel tends to ride toward the operator (me) during operation, causing the V-belt on the back side of the saw to contact the belt guard and stall the motor. I can smack the shaft with a mallet back toward the back of the machine (it moves about ¼ inch), but it continues to ride toward the operator, stalling the saw.
I have adjusted the cant of the upper wheel, and the blade tracks in the middle of both wheels for a short time, but soon enough the top tire begins to ride off the wheel, and soon the lower shaft begins to ride forward as well. Any ideas on fixes?
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Band Saw Problems
Ken Schumm and Hardwood--
The bearings on the lower wheel are of the sleeve variety. There is no noticeable play in the bearings when I takd the tension off the blade, and wiggle the wheel.
Saw is more than 40 years old, so maybe its time to replace something?
I glued the tire to the upper wheel using rubber cement. That seems to have worked, but I haven't been able to run the saw for more than 30 seconds before the shaft in the lower wheel begins to ride toward me again, jamming the belt on the back side of the saw against the belt guard, and stalling the motor.
Replace the lower shaft bearings?
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Band Saw Problems
Ken--
the entire shaft moves foward to the operator, "pulling" with it the lower wheel on the operator side, and the V groove pulley on the back side. When that happens, the V groove pulley on the back side comes in contact with the belt guard support, and the motor stalls.
I have removed the lower wheel and the pulley, re-installed them according to spec, and re-tightened the set screw. I get no indication when the machine is running that either the wheel or the pulley slide on the shaft (indicating a loose set screw).
Perhaps the rubber tires are worn on one side, causing the saw blade to pull on the wheel in one direction, thereby causing the shaft to ride toward the operator. Possible?
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Band Saw Problems
Hardwood--
My band saw is of the same construction as yours of old. solid steel shaft, with a keyway on each end. Pulley (of "pot metal" quality) slides on shaft, you insert the square key, and tighten down the pulley in place using a set screw. Both pulley end and lower wheel end of the shaft use this arrangement.
Parts manual shows, on the pulley side and in this order starting from the outermost part, a 5/8 retaining ring, a spring washer, 1 11/16 internal retaining ring, and lastly, a ball bearing. I need to check to determine if the two retaining rings and the spring washer are intact. That may be the source of my problem.
Stay tuned, and I appreciate your sticking with me on this one.
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Band Saw Problems
Kschumm, Earthwrks, Kthompson, Hardwood, Auerbach--
Success!!!
I removed the shaft from the lower wheel housing. I found all the pieces intact (External C clip, spring, interior C clip, etc.) but the external C clip that holds the shaft tight against the spring clip and face of the sleeve bearing had either slipped from its place in a groove on the shaft (doubtful), or (more likely) had never been seated fully in the groove when the C clip was installed, and had finnaly just worked its way down the shaft, allowing the shaft to ride 1/4 inch toward the operator, and pulling with it the pulley into the blade guard at the rear of the saw housing.
Since I never had reason to fiddle with the shaft in the twenty plus years that I have had the saw, I guess that my father-in-law, who owned the saw before me, was the guilty party for not installing the C clip fully. Easy to do--the groove on the shaft is quite thin, and the C clip is difficult to slide along the shaft--very tight fit.
Anyway, problem solved, and thanks to all who offered good advice.
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