Bandsaw throwing narrow blades off wheels

reible · Post by **reible** » Wed Dec 21, 2011 12:31 am

For anyone who might be lost at this point a couple of pictures in reference to the last few posts. As of now we do not know if this has anything to do with the problem but it is something you might want to check on your bandsaw.

[ATTACH]15311[/ATTACH]

Mine was really bent as shown. Sorry no photo of the "fixed" part but if the lower wheel can be moved in and out this is a potential cause.

[ATTACH]15312[/ATTACH]

Ed

dusty · Post by **dusty** » Wed Dec 21, 2011 5:04 am

If the blade is slipping off the back of the wheel, I would expect to find the blade behind the wheel. Is that where it is found or is it loose out front of the wheel?

dusty · Post by **dusty** » Wed Dec 21, 2011 6:53 am

reible wrote:For anyone who might be lost at this point a couple of pictures in reference to the last few posts. As of now we do not know if this has anything to do with the problem but it is something you might want to check on your bandsaw.

[ATTACH]15311[/ATTACH]

Mine was really bent as shown. Sorry no photo of the "fixed" part but if the lower wheel can be moved in and out this is a potential cause.

[ATTACH]15312[/ATTACH]

Ed

The way that piece is bent and the degree to which it is bent makes me think that it was done intentionally. The bolt that holds it in place would tend to flatten the bend if screwed down tight.

[ATTACH]15313[/ATTACH]

[ATTACH]15314[/ATTACH]
There is a slight bend in that part but it should be gradual.

On yours it almost looks like someone tried to drive the lower axle out from the back side without removing the retainer.

JPG · Post by **JPG** » Wed Dec 21, 2011 11:55 am

dusty wrote:The way that piece is bent and the degree to which it is bent makes me think that it was done intentionally. The bolt that holds it in place would tend to flatten the bend if screwed down tight.

[ATTACH]15313[/ATTACH]

[ATTACH]15314[/ATTACH]
There is a slight bend in that part but it should be gradual.

On yours it almost looks like someone tried to drive the lower axle out from the back side without removing the retainer.

Perhaps the PO tightened it with the bearing jammed and instead of pulling the bearing into the bore, the bracket bent. That would be my 'guess'.

dusty · Post by **dusty** » Wed Dec 21, 2011 1:20 pm

JPG40504 wrote:Perhaps the PO tightened it with the bearing jammed and instead of pulling the bearing into the bore, the bracket bent. That would be my 'guess'.

Isn't it bent the wrong way to fit that synopsis?

JPG · Post by **JPG** » Wed Dec 21, 2011 4:30 pm

dusty wrote:Isn't it bent the wrong way to fit that synopsis?

Nope! The short leg with the slot that is facing up Ed's pix slips over a rib in the 'chassis'. The screw is inserted through the 'slot' from the bottom in Ed's pix. The bracket got bent down in Ed's pix as the screw was tightened.

Up in Ed's pix is towards the 'chassis', Down in Ed's pix is out from the 'chassis'. The bracket got bent out(down in Ed's pix).

dusty · Post by **dusty** » Wed Dec 21, 2011 5:38 pm

JPG40504 wrote:Nope! The short leg with the slot that is facing up Ed's pix slips over a rib in the 'chassis'. The screw is inserted through the 'slot' from the bottom in Ed's pix. The bracket got bent down in Ed's pix as the screw was tightened.

Up in Ed's pix is towards the 'chassis', Down in Ed's pix is out from the 'chassis'. The bracket got bent out(down in Ed's pix).

OK, if you say so. Thank you.

JPG · Post by **JPG** » Wed Dec 21, 2011 6:26 pm

dusty wrote:OK, if you say so. Thank you.

Tis much easier to visualize things when 'in hand' - No?

chipmaster · Post by **chipmaster** » Fri Dec 23, 2011 10:34 pm

My bandsaw came with a 1/2 inch blade that worked great. I recently bought both 1/4 and 1/8 inch blades. I first tried the 1/8 inch and it wanted to walk off the wheels (I was turning by hand with the cover off BTW).

Also, my clip holding the lower wheel bearing assembly was bent exactly as the one pictured here. I pulled it off and looked at it and was sure it started life straight, so I straightened it out. With it bent, you could slip the lower wheel bearing assembly in and out of the chassis over about a 1/4 inch slop range. With the clip straight, the lower wheel is tight. Unfortunately, the 1/8 inch blade still wanted to walk. So I tried the 1/4 inch, and it is working fine.

Incidentally, my upper wheel has a lot of runout, or slop for lack of a better term. I pulled it partly off the spindle it rides on, and it has needle bearings. I didn't want to pull it all the way off because I didn't want to deal with bearings going all over the place. The bearings were lubed well but I put a drop of sewing machine oil on them before reassembling everything.

Since the spindle and bearings are steel, I asume whatever wear has occurred to cause the slop has been in the wheel itself, since its some sort of cast lightweight material--aluminum or pot metal; can't really tell.

Question: I considered packing some grease on the needle bearings to take out some of that slop. Any opinions on that idea?

v/r,

Rick

JPG · Post by **JPG** » Fri Dec 23, 2011 10:45 pm

[quote="chipmaster"]My bandsaw came with a 1/2 inch blade that worked great. I recently bought both 1/4 and 1/8 inch blades. I first tried the 1/8 inch and it wanted to walk off the wheels (I was turning by hand with the cover off BTW).

Also, my clip holding the lower wheel bearing assembly was bent exactly as the one pictured here. I pulled it off and looked at it and was sure it started life straight, so I straightened it out. With it bent, you could slip the lower wheel bearing assembly in and out of the chassis over about a 1/4 inch slop range. With the clip straight, the lower wheel is tight. Unfortunately, the 1/8 inch blade still wanted to walk. So I tried the 1/4 inch, and it is working fine.

Incidentally, my upper wheel has a lot of runout, or slop for lack of a better term. I pulled it partly off the spindle it rides on, and it has needle bearings. I didn't want to pull it all the way off because I didn't want to deal with bearings going all over the place. The bearings were lubed well but I put a drop of sewing machine oil on them before reassembling everything.

Since the spindle and bearings are steel, I asume whatever wear has occurred to cause the slop has been in the wheel itself, since its some sort of cast lightweight material--aluminum or pot metal]
Light grease is what they need, not oil. Unless the outer ring is worn, the needles should not jump out.

Now please describe the blade parting from the wheel - which wheel (first) and which side(in/out) and where(12= up, 6=down, 3=blade guides, 9=yoke.

Also have you checked the cant?

Lastly, is the upper wheel 'bent'?

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Bandsaw throwing narrow blades off wheels

Same EXACT situation