Shopsmith Forums

That's quite weird. I watched that several times. I am not sure what I am seeing, but rather than seeing wheel wobble, I believe I am looking at a wheel where the the back rim is not of consistent thickness. Ditto the front rim.

Please don't watch the outer wheel edge... look at the machined groove the tire rides in.......... That is a machined surface and reflects how the wheel was made and there for the location of what might be wrong.

I don't see anything in the video that indicates the problem for sure, the movement could indicate that the tire/wheel is out of round but we haven't check for that yet in the videos. Perhaps tomorrow I'll try to get a video of that.

Ed

Guys,

Thanks for all the feedback. I'm totally open to the fact that what I'm seeing is an optical illusion. Again, the only real reason that I looked in the first place was the fact that the blade kept jumping in and out of the groove on the backup bearing. It would stay for a rotation or two, jump and then return...

Yes, the retention bolt on the lower wheel is in place and tight.

I also can understand that the edge of the wheel may not be the best reference point, which is why I posted the video in the first place.

So, this is what I think I'm gonna do to help troubleshoot.

1) I'm gonna remove the lower wheel, and reinstall it to make sure that everything is good there.

2) Reinstall the newer form of the bearings (since I currently have the brass one installed) and get the backup bearing aligned to the blade's path.

3) I'm gonna test two blades, the 1/2" blade I've been using and one of my other, never been used, blade. This should hopefully help rule out the blade itself.

4) I'll take vids of the blades jumping out of the backup roller (if the issue doesn't miraculously go away)

5) I'll try to take vids of both the lower wheel and upper wheel in better, less reflective, light with a reference scale so we can determine if there is actual wobble to the tire that would affect the blade negatively.

It'll take a few days to do all this since I am at the mercy of the weather.

algale wrote:That's quite weird. I watched that several times. I am not sure what I am seeing, but rather than seeing wheel wobble, I believe I am looking at a wheel where the the back rim is not of consistent thickness. Ditto the front rim.

Yes, I noticed that too and it contributes to the optical illusion of a wobble. The outside diameter of the wheel and the inside of the rim where the tire seats are machined. The outside face of the wheel is not machined so it shows up as a difference in the thickness of the flange. That and the fact that the tire is not seated against the flange makes the other side of the wheel look like it is wobbling. Again an optical illusion.

Two things. I assume your blade tension is correct. I think the biggest contribution might be the alignment of the bearing grove with the back of the blade. Even a small misalignment would probably cause the blade to track and pop out and track etc. Make sure whatever backup bearing set you have is installed properly vis-a-vis the left right alignment.

Please note that in the image I posted (this thread) shows a ruler located on the face of the wheel and on the edge of the tire. If the wheel is wobbling, so is the tire; machining of the wheel will have no effect. If the wheel is out of round, that will show also.

The image I have should have been taken at a slight different angle to show that the ruler is against the edge of the tire. BTW, the machined groove on ther face of the wheel runs right next to the tire. A visual inspection of the groove/tire shows that.

I did not know that the groove was machined and the face of the wheel was not. Thanks Ed.

Ignoring the reflections, I see the machined 'edge' varying along the scale and the tire not against it all the way around.

Regardless of that, the blade should follow a fairly straight path around the wheel.

What we need to be looking at is the amount of od variance at the tire.

Greetings!

Thanks for your patience. I was able to get into the shop and take some pictures and make a few videos. Here are a few pictures I thought might interest you guys...

First, the 'naked' Bandsaw Sorry, couldn't resist.. here is the actually wheeless bandsaw, though I'm sure you all know what it looks like... I noticed the difference in the axle types when I first got the new wheels, but in case you haven't seen them. The old type is on the right. Also, here is a quick image of the bearings. To switch things up, the new ones are on the right. Now, before moving onto the vids, I just wanted to make sure that you guys saw the bottom tires 'slot'. I don't see any issue here...
Okay, I've taken two videos of the lower wheel in action. I tried to get better lighting and less camera shake... I think that there is both wobble and that the tire is out of round but only slightly. What do you guys think?

Checking for Tire Wobble
https://youtu.be/5vo11hrobQ8

Checking for Tire Roundness
https://youtu.be/FA8bLOc6ya0

Thanks in advance!

gatheringsplinters wrote:Greetings!

So, I've just received a second set of replacement wheels/tires from shopsmith. I was unable to keep the bandsaw blade in the groove on the backup bearing so I took a moment to look at the tires. The bottom one appears to wobble. Could this be the source of my issue and is there anything I can do to fix the wobble?

I made a vid with the bandsaw blade off and turning the tire by hand. The ruler is there for reference and you can see the tire wobbling.

https://youtu.be/EKhYfa4Yl-8

Thanks in advance.

That is the same video you posted before.

jsburger wrote:

gatheringsplinters wrote:Greetings!

So, I've just received a second set of replacement wheels/tires from shopsmith. I was unable to keep the bandsaw blade in the groove on the backup bearing so I took a moment to look at the tires. The bottom one appears to wobble. Could this be the source of my issue and is there anything I can do to fix the wobble?

I made a vid with the bandsaw blade off and turning the tire by hand. The ruler is there for reference and you can see the tire wobbling.

https://youtu.be/EKhYfa4Yl-8

Thanks in advance.

\

That is the same video you posted before.

Err oops.. Here is the correct link...
https://youtu.be/5vo11hrobQ8

I'll correct it in my post too