Repairing a 22 inch bandsaw wheel. Or maybe not.
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- เผยแพร่เมื่อ 11 ก.ย. 2024
- A customer brought me this large bandsaw wheel to repair. He said it is throwing blades off of it. Well after dialing it in on the Jet lathe I am not seeing much I can do with it. What do you think? Leave me comments below.
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Tom - My opinion is as follows : Because of the grip of the Fours Jaws
The material on the face of the wheel is bowing out . Notice that exactly in between
the four Jaws your indicator climbs to + .005 and retracts -.005 . At every jaw your
indicator reads 0.000 . Here is an idea . In a 3 Jaw Chuck Turn up a plug with a husky\
shoulder that fits the I.D. of the Wheel . Drill and tap the plug to accept a cap that can
pull the wheel up against the shoulder . Turn or center drill the head of the bolt.
Support it by using a Ball Bearing Center. The wheel now is unsupported and becomes
a tuning fork. Use very light cuts to clean up the problem . -- Jim
Awesome suggestion. That is why I love this community. The customer is coming this Saturday so I will see if he wants to spend the extra money for me to go with your idea.
Tom - I didn't want to suggest anything. I like to stay in my own lane .
But I felt that your request was legitimate . So I stepped out of my
comfort zone . Your friend -- Jim
I appreciate your input. 🙂@@TangentJim
So very true. Can't fix it ,if its not broke. Very honorable of you to tell the owner the truth instead of just cleaning it up and giving him a bill. I admire that these days.
I think you made the right call, it's not that bad more likely a shaft or bearing problem.
Thanks for showing Tom !
Thanks Dean.
Enjoyed your discussion/thought process
Thanks Chuck. I have gotten some good suggestions in the comments. That is why I love our machining community.
Thanks for sharing 👍 You need to build one of Mr. Pete's Crain. 😅
I definitely need something.
Intriguing problem Tom, im looking forward to seeing the answer
It has me a little stumped there Dave.
Gday Tom, very interesting, I’m thinking the jaws maybe influencing the weird runout, possible mount it on a shaft somehow to see if the readings are different, great job mate, cheers
Hey Matty. Others have suggested making an arbor and mount it up that way and check the run out also. I may do that after I talk to the customer and see what direction he wants to go.
G’day Tom. Good job on the set up to hold that big wheel. I like that DTI you have with the pivoting arm on it. Never seen that before. Must be handy having a forklift. I don’t think my shop crane would lift that chuck. Cheers 🍻 Aaron
Hey buddy! That is why I did not send you any video on it since I did not do any machining. The forklift is a godsend for sure. Of course in your earlier years I imagine you could have just thrown that chuck over your shoulders. 😋
Great work 👏👏
Thanks 🙏
I think your stress analysis makes perfect sense. And I also think that with a well installed new tyre, it will work perfectly fine.
Thanks Michel.
Hello Tom,
Another interesting job, I initially thought you would have held it on a faceplate, thus making it easier to turn the outer surface, but as the story unfolded no turning took place. Did the lathe bed go back together okay?
Cheers.
Paul,,
Yes the gap went back in spot on.
Good video thanks for sharing Tom
Thank you.
Interesting set up tests Tom. Maybe good enough for a bandsaw. Perhaps a new rubber tyre will help to align the blade. My small bandsaw does have an adjustment knob on the side. Hope your customer appreciates all your efforts with beer or wine 🍷 Cheers Nobby
Hey there Nobby. I see the customer this weekend so we shall see. 👍
Hay Tom another grate video thanks for taking tim to do it cheers
Also on the stress thingie I'm with you on this one but a slight hump in outer won't interfere with the blade
As for balancing any tyre shop would be able to balance that as it has a large enough centre
Might won't check for flatness ie on tis flat see if it has a wobble in but you can and think you would have done this while on lathe
Thanks again for sharing catch you up on the next one Cheers
Thanks. 🙂
Maybe he has bad bearings or just need to adjust the blade tighter. Thanks for the video keep on keeping on.
Hey there Harold. I forgot to mention they got me the bearings and they are fine.
Well, you can keep that snow Tom!
LOL! It has finally melted. We had it over a week.
One of those oddball jobs where you probably don't even get paid for. Might be out of balance. I know on my little metal bandsaw the blade has to be really tight. Not sure about a bandsaw that big for wood. Mr. Khaos was not happy that you were keeping him awake. Can you give us a followup on the wheel when you find out what the problem was. Thanks for the video.
Hey Jim. Customer is coming this Saturday to see what I have found or not found and see where to go from here. Some good suggestions from viewers on other things to check and try.
A fork lift Tom? Now I'll never catch up. You've gone a pulled a Curtis...
Ha ha! Damn 4 jaw is heavy. If I was 30 years younger I probably could have hoisted that thing up there by hand. 💪
Yeh, BSW must be a good lathe. Very interesting to see how you held the wheel. My block is out of line and I always suspect it was swapped over with another lathe in a college or school. Cheers Tom, rgds Paul
Hey Paul. Good to hear from you. I ordered some replacement bolts from China because we can't get BSW hardware here.
Tom you must have been cleaning more on rhe shop. It looks amazing.
Thanks Michael. I have been doing what I can in between projects.
Maybe lay it on the surface plate, and see if it's flat, or a 'tater chip? Also, if you do end up having to turn it for whatever reason; it may be worth the time to make a precise fitting mandrel, rather than grabbing the rim with the 4-jaw. The jaw pressure could be distorting the wheel?
Good idea. I still have it chucked up on the lathe to show the customer my findings. I will put it on the plate after I show him.
Sounds like there could be a shaft or bearing issue or just the tire was wore .. Great sort out Tom !
Thanks Shawn. 🙏
Your stove looks Cody be hard to get motivated for work 😂
It sure does help on these cold winters.
Wheel appears fine. I believe some of the kick you were showing may have been from chuck clamping. Never the less even .010" should not be a problem for blade tracking on a saw that large besides it is on a non critical surface. The back stepped surface would be more of an issue.
Thanks Brian. My line of thinking too. Customer is going to buy new urethan tires and true them up (He did not true up the previous ones after he put them on) and see how it tracks. He brought me the bearings and they were perfectly fine so not an issue there.
Hey Tom, you might benefit from putting a heat Reclaimer on that stove pipe , something to consider.
Hey there buddy. I had kicked that idea around. I probably should add it to the To Do list.
You might be able to machine the outer rim and the blade groove to be concentric. What a weird issue.
hi tom
my first thoughts are like yours "stress"!!!
also seems weird to have bsw & metric on the lathe, maybe they are UNC, same pitch as BSW but different thread form 60 instead of the bsw 55 degrees, just a thought
see you next time
atb
Kev
Thanks Kevin for confirming what I am thinking.
Hi Tom. A lot of old UK machines and tooling were exported to Asia. They were/are using what's available on hand. The works probably subbed out to smaller shops. Some modern imports still have Whitworth threads. Good to see the fun in changing your heavy chuck. Looking forward to the crane video. Cheers Tony
Hey Tony you are probably right on the mix matched hardware.
Not everything works out . I may have been tempted to mount it on a solid arbor . 👍
Hey Max. I showed the customer what I was finding and suggested I could make up an arbor for further investigating. He decided against it and is going to check its balance and put on a urethan tire and true it up and see how it runs.
If 10 thousandths out should not be more the the adjustment of the blad tracking should over come. I would be looking for a bad shaft or bearing. The wheel should be fine
Customer brought me the bearings and they are fine. I suggested he check the shaft and tensioner and true up the rubber tire.
@hilltopmachineworks2131 yes it could just be the tires
Build a mandrel, put it between centers and recheck all runouts?
Thanks for the suggestion and that will be plan B when I see the customer this Saturday.
Is there a face on the inner bore that comes up on a shoulder on the shaft? How is the wheel retained on the shaft? Could be the faces are out of alignment? Causing the wheel to cock other shaft. Bad shaft, bad bearings, bad Bearing bore...
There is a small shoulder inside the bore that each bearing seats against. It is not much but I will try and see if I can get an indicator tip on it and check. Customer brought me the bearings and they seem fine.
G'day Tom. You have tried to do the best things to try to find the problem. I would suggest to make a twin tapered mandrel that will fit into the centre hole or baring section, fit into the jaws true up the centre shaft then you will see exactly where it might be bowed or out of round, because there won't be any pressure or forces on anything except the centre baring section, therefore you should get a truer idea of what is happening as far as the saw drive/ flywheel is concerned. Good video, keep up the good work.
Tom, hope you are doing well. Taking I quick break at work and watching your video.
Big wood bandsaws need to have a crown put in the tires to get them to run true otherwise they are all over the place. Lots of videos out there on different ways of crowning a tire.
Hey Gary. Good to hear from you. I will mention that to the customer. Thanks 👍
I’m going with bad bearings…
I failed to mention the customer brought me the bearings also and they seem fine.
So very true. Can't fix it ,if its not broke. Very honorable of you to tell the owner the truth instead of just cleaning it up and giving him a bill. I admire that these days.
Thanks. 🙏
So very true. Can't fix it ,if its not broke. Very honorable of you to tell the owner the truth instead of just cleaning it up and giving him a bill. I admire that these days.
So very true. Can't fix it ,if its not broke. Very honorable of you to tell the owner the truth instead of just cleaning it up and giving him a bill. I admire that these days.
So very true. Can't fix it ,if its not broke. Very honorable of you to tell the owner the truth instead of just cleaning it up and giving him a bill. I admire that these days.