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4x6 bandsaw pulleys messed up

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ttabbal

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#1
They don't run true and don't stay put. I can only assume the wobbling is causing enough vibration to loosen the set screws. If I try to use the belts in other than the middle speed, they fly off. :) Otherwise the thing cuts fine, if a bit noisy. I was wondering if anyone else has seen this and how they fixed it. I figure I'll be replacing the pulleys after I ensure the shafts are reasonably straight.

No warranty, so I'm on my own to fix it.
 

royesses

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#2
If the shafts are not bent the easiest is to purchase the pulley(s) from Grizzly. Motor pulley is $8.00 and the gearbox pulley is $9.00.

Roy
 

markba633csi

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#3
I had a similar issue with my motor pulley- I finally fixed it by drilling and tapping for a second setscrew on an adjacent groove.
On my gearbox pulley I put two setscrews in the same hole, one on top of the other. No more loosening.
mark
 

NortonDommi

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#4
I've struck crappy castings a few times plus bed machining e.g. off-center holes, tapered bores etc. If the shafts are O.K. sometimes it's worth boring the pulley out true, making and fitting a sleeve. At least then you know everything is square to the world.
 

ttabbal

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#5
I'll check those out thanks for the tips!
 

ttabbal

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#6
Well, I received pulleys from Grizzly today. Took the old ones off and started examining things more closely. The shafts are as straight as one would expect from HF, +/-0.002ish. Good enough. The replacement pulleys are a fair bit smaller and for a different belt. pfftttt... The worm gear one doesn't even have a slot cut for the key. On the up side, I did order a matching belt, figuring the old one was probably due for replacement anyway, so at least I have one that will work.

With the new pulleys and belt, I think it will run. But I'll have to bore out the holes about 1mm each, and cut a keyway in the one. I can probably get a good enough keyway cut with the mill.

The current pulleys are REALLY bad. Suitable for being melted down, not much else. Cathartic smashing with a large hammer might be in order. I had to use a gear puller to get one of them off, it was mangled pretty badly.
 

ttabbal

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#7
Got it going. The keyway I cut isn't great, but it's good enough. And it's much quieter without those pulleys rattling around.
 

Aaron_W

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#8
Weird that the pulleys didn't match. I bought a set of replacement pulleys from Grizzly for my HF 4x6 and they were a perfect match.
 

Cadillac

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#9
Weird that the pulleys didn't match. I bought a set of replacement pulleys from Grizzly for my HF 4x6 and they were a perfect match.

Probably the age of machines. The older ones probably had larger shafts. HF probably figured they could get away with a smaller shaft saving cost upping profits seems pretty standard these days unfortunately.
 

ddickey

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#10
I just made a new pulley for mine as it came broken. It was a good project.
 
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