Having lots of trouble with my 2x72 contact wheel

S

Sideburns

Joined
Mar 28, 2016
Messages
4
The 2x72 grinder that I bought has alot of wheel play Im not sure what to do about it. Im pretty sure that bolt on left wasn't moving before but after 3 min of use it got a lot of wobble and shake. Im a college student really into collecting and I wanted to but a cheaper 2x72 that a random guy made it seemed solid at the time but not so much now. Any suggesting would be great! check out the video

https://youtu.be/Gbju4xB4rYc

https://youtu.be/tvAY0wuVcRo

Thanks for the Help
 
Firstly, Whats with that wobbly bolt you are using as a spindle?
But, If the two faces between the bore are parallel, The bore does not have to be highly accurate I.D. but it helps.

If your wheel is running on two ballbearings. With a spacer between their inner races, You should be able to tighten up that spindle bolt and assuming the wheel is true, Should run no problems.

At the end of your second video, Whats the thrustbearing for ?
 
i think you got s-crewed. the vid shows a thrust bearing that appears to have been riding against plastic. did you get a platen?(edit) there might be a metal tube in the center, but that still wont work because it will rub on the bolt itself.
 
Last edited:
That looks like a horrible method of mounting a wheel.

The bolt should be threaded through the arm, the spacer placed on it, and the wheel and bearings slid on the bolt. A final locking nut should then be snugged up against the wheel. There should be a sleeve that runs through the bearings so the nut can't pinch the wheel. The bolt should be rigid in the arm.

Ignoring the bad setup, on your system, it appears that there should be some sort of sleeve or a different bolt through the arm. The axle bolt should not have any play.

Contact the seller about the problem and ask him what is wrong. send him the videos.
 
Looks like your wheel welded to the bolt and then the bolt rotated in the arm and totally damaged the hole.

It looks like you need to remove the bolt from the wheel and arm. Get a new one. Drill a new hole in the arm and get new bearings for the wheel. That is the bearings did not melt the wheel from friction.

Best to get a new wheel and bearing off of ebay.
 
I agree with AVigil. It looks to me like the bearing was probably either cheap quality or damaged and packed up when running. When it locked up it started to spin the bolt in the arm and slopped out the hole in the tool arm badly. You will probably be looking at needing a new tooling arm, and bearings at the least, and possibly a new wheel. If this happened after 3 minutes I would be straight back to the maker of the grinder.
 
Lieblad said:
Firstly, Whats with that wobbly bolt you are using as a spindle?
But, If the two faces between the bore are parallel, The bore does not have to be highly accurate I.D. but it helps.

If your wheel is running on two ballbearings. With a spacer between their inner races, You should be able to tighten up that spindle bolt and assuming the wheel is true, Should run no problems.

At the end of your second video, Whats the thrustbearing for ?
Click to expand...


I dont think I have a thrust bearing this is everything I have I might go down and pick up skateboard bearings and a smaller hex do you think that would help?



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AVigil said:
Looks like your wheel welded to the bolt and then the bolt rotated in the arm and totally damaged the hole.

It looks like you need to remove the bolt from the wheel and arm. Get a new one. Drill a new hole in the arm and get new bearings for the wheel. That is the bearings did not melt the wheel from friction.

Best to get a new wheel and bearing off of ebay.
Click to expand...


With the picture I just posted do you thins if I got A smaller hex and put skateboard bearing in or metal tube that is greased the the bolt wont drag on the white thing in the wheel.

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At this point it appears the hole in the arm for the bolt is wobbled out of round and bigger than it should be. If it can be bored out perfectly I guess it could have bearings installed. That depends how large of bearings can be put in, because you don't want your large contact wheel on a 1/4 inch bolt. That would also require changing the bearings in the wheel. Large OD small ID bearings may be tough to find to fit the bore of the wheel. If the guy you purchased it from sells and builds grinders, I would be contacting him for a new arm and wheel.
 
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