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Craftsman 12" Band saw - proper motor v-belt tension?

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Forum topic by abehil posted 10-05-2014 11:23 PM 1647 views 0 times favorited 7 replies Add to Favorites Watch
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abehil

104 posts in 803 days


10-05-2014 11:23 PM

Topic tags/keywords: bandsaw question

I bought this band saw off CL and it’s the first band saw I’ve owned. I’m cleaning it and checking the adjustments. I’ve turned it on briefly and cut a small piece of wood. There is a little bit of vibration which reminded me about my HF drill press when the belt is a little loose so I gave the belt the squeeze test.

The motor belt seems looser than I would expect and google isn’t helping me find out what proper belt tension for the motor should be. How is the belt adjusted and how tight should it be?


7 replies so far

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runswithscissors

2189 posts in 1490 days


#1 posted 10-06-2014 12:10 AM

I’ve seen suspended motors that were too loose in their mountings, making them want to bounce, thereby creating vibration or shaking. A way to tame that is to figure out a way to hold the motor rigidly, once the belt tension is good. You need adjustability, obviously, then a way to lock it down.But you’ll need to figure out how to do that on your saw.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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Loren

8309 posts in 3112 days


#2 posted 10-06-2014 12:27 AM

If the belt has sat for a long time on the sheaves and
not been run, it can get deformed and there will
be bump every time it goes around. If you
have a deformed belt tensioning the motor
tighter won’t help. With a “healthy” belt tension
is not that critical, imo, but the belt should be
tensioned enough not to slip.

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abehil

104 posts in 803 days


#3 posted 10-06-2014 12:39 AM

If I pinch the band saw belt together the two touch. That seems too loose to me. There doesn’t seem to be any deformation because it’s loose.

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Loren

8309 posts in 3112 days


#4 posted 10-06-2014 12:44 AM

Ok, try it tighter.

If vibration persists toothed v-belts are not
expensive and address the issue. Link belts
work too, at a higher price.

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Surfside

3389 posts in 1638 days


#5 posted 10-06-2014 09:13 PM

Remove the drive belt and turn on the machine
This will indicate whether or not the cause for vibration is coming from the motor, or because of the way the
motor was mounted. If vibration still occurs after fixing either issue, try the next step:
Put the drive belt back on and remove the blade
Run the machine, and if vibration occurs, it may be due to the tension of the drive belt, or the alignment of the
pulley, and/or the lower wheel (bearings and/or the balance). Check each, run the machine, and see if the problem
doesn’t fix itself.

-- "someone has to be wounded for others to be saved, someone has to sacrifice for others to feel happiness, someone has to die so others could live"

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abehil

104 posts in 803 days


#6 posted 10-07-2014 02:34 AM

How to remove the drive belt is kind of where I am. There are guards around the pulley housings and the pulley is fed through the housing so that the pulley has to come off before the housing. Who thunk that up? I’m beginning to think that the motor has to be loosened to get the belt off.

I have ordered a 3/8” Olson MVP blade so I’ll be taking the blade off soon. It came with a 1/2” blade I think is just a craftsman blade.

But I have a question about the blade guides. Remember this is my first so I really am a novice. Anyway, it seems like that left guide should be touching the blade like the one on the right side – am I right about this?

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runswithscissors

2189 posts in 1490 days


#7 posted 10-07-2014 06:21 AM

Yes.

-- I admit to being an adrenaline junky; fortunately, I'm very easily frightened

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