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Bandsaw Drive Pulley Sliding Off Drive Shaft

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Forum topic by ggfuzzy posted 05-02-2010 08:49 PM 2692 views 0 times favorited 14 replies Add to Favorites Watch
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ggfuzzy

8 posts in 2562 days


05-02-2010 08:49 PM

Topic tags/keywords: bandsaw question

Has anyone seen this before? I inherited a JBS-14MW bandsaw from my grandfather and I’m in the process of cleaning it up. I noticed the inside edge of the 4-step drive pulley would grind against the motor housing once every revolution. I took off the drive pulley to examine it…it doesn’t have any set screw to hold it in place. Only a square key keeps it positioned on the shaft. After replacing the drive pulley, I noticed that when I turn the saw on the pulley starts working its way off the end of the drive shaft (away from the motor). I’m afraid to let it continue running to see if it will work itself off completely, but the pulley certainly appears to be headed all the way off. I’d be grateful for any ideas anyone has on correcting this problem.


14 replies so far

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Michael Murphy

452 posts in 2472 days


#1 posted 05-02-2010 09:17 PM

Drill and tap a hole to fit a set screw or get a couple of shaft collars to fit the shaft. Put one in front and one behind the pully.

-- Michael Murphy, Woodland, CA.

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ggfuzzy

8 posts in 2562 days


#2 posted 05-02-2010 09:39 PM

The “drill and tap” option might work, but the drive shaft isn’t long enough for the collar option. The pulley extends about an inch past the end of the shaft even when the pulley’s snug (and rubbing) against the motor housing. I’m wondering what the original intent of the design was…the designers obviously didn’t expect this to be a problem.

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Michael Murphy

452 posts in 2472 days


#3 posted 05-02-2010 11:02 PM

Why is it a step pulley? Does it have another stepped pulley on the drive wheel? The only reason for a step pulley would be to change speeds. Perhaps switch it (them) for a single pulley that fits and has a set screw and provides the right speed.

Unless you are switching between cutting metal and cutting wood you probably don’t need to change speeds.

-- Michael Murphy, Woodland, CA.

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ggfuzzy

8 posts in 2562 days


#4 posted 05-02-2010 11:19 PM

For changing speeds, as you guessed. There’s an intermediate pulley, also with multiple steps, in the gear box above the drive pulley. I could switch them out for a single, but I’d prefer to figure out what’s going wrong with the factory version first. I don’t like to reduce functionality unless forced. it’s possible that all I really need to do is reallign the motor so that the drive shaft is perpendicular to (or slightly turned away from) the intermediate pulley under load. I’ll let this forum run for a bit and see if anyone’s seen (and corrected) this same problem before.

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lew

11347 posts in 3222 days


#5 posted 05-03-2010 02:09 AM

Just a thought, maybe the motor is mounted so that the shafts are not parallel. This would cause the pulley to “shift” one way or the other depending which direction the “tilt” is angled.

-- Lew- Time traveler. Purveyor of the Universe's finest custom rolling pins.

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ggfuzzy

8 posts in 2562 days


#6 posted 05-03-2010 02:19 AM

This was my initial thought, but the problem didn’t start until after I removed the pulley to investigate why it was rubbing on the motor housing. Maybe my act of removing the pulley loosened up a bit of corrosion or something that was previously keeping the pulley in place and preventing it from sliding out? I looked briefly at the motor mount, and I may be able to adjust the mount angle down a little bit…maybe enough to correct the problem. There doesn’t look to be a lot of play designed into it, though.

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Michael Murphy

452 posts in 2472 days


#7 posted 05-03-2010 05:02 AM

It’s unusual to not have a set screw or something to hold a pulley in place on a motor shaft.

-- Michael Murphy, Woodland, CA.

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ggfuzzy

8 posts in 2562 days


#8 posted 05-03-2010 05:12 AM

I agree…this is not what I’d expect. The final pulley (connected directly to the lower wheel) has a set screw, but the intermediate pulley (another 4-step pulley) does not have a set screw. It’s almost as if the drive pulley and intermediate pulley are supposed to float on their respective shafts and find an equilibrium point based on which combination of pulley sizes is selected by the user.

View MedicKen's profile

MedicKen

1610 posts in 2929 days


#9 posted 05-03-2010 05:20 AM

I just looked up the manual for a Jet Closed stand saw and it shows a set screw on the motor pulley. I would guess that there is a set screw on the sheave somewhere. It may be covered with dirt or plugged with grime. Clean it up really well and take another look.

-- My job is to give my kids things to discuss with their therapist....medic20447@gmail.com

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ggfuzzy

8 posts in 2562 days


#10 posted 05-03-2010 02:23 PM

Good call, MedicKen. I cleaned off the grime and found a set screw hole…no set screw in it, though. I’ll check with my local Woodcrafters and see if they can dig one up. Thanks for your assistance, guys!

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Wolffarmer

407 posts in 2704 days


#11 posted 05-03-2010 04:34 PM

I would not bother with Woodcrafters to get a set screw, I would go to my local Ace hardware store “The first hardware store i come to” Or any one of the others around here that has those nice sets of boxes with many many little parts. I make them a fortune buying a little piece here and there. It is amazing what all they have.

speaking of which i need to make a parts run today.

Randy

-- That was not wormy wood when I started working on it.

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ggfuzzy

8 posts in 2562 days


#12 posted 05-03-2010 04:38 PM

Good idea…thanks!

View mrg's profile

mrg

659 posts in 2466 days


#13 posted 05-03-2010 04:40 PM

ggfuzzy the screw size should be listed in owners manual, if not take the screw from another pulley and you can get it at the auto parts store, HomeDepot or a hardware store for less than a buck. If you don’t have the manual go to etoolsclub.com and they have the manual and schematics with the parts listings.

-- mrg

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wiswood2

1138 posts in 3163 days


#14 posted 05-03-2010 06:26 PM

I have never seen a pully with out a set screw ,buy a new one they are cheap.
Chuck

-- Chuck, wiswood2 www.wisconsinwoodchuck.com

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