Bottom bracket thread repair?

[goinmobile]

Has the topic been addressed somewhere? Search gets BB drives.

The problem is the BB tube is out of round. Both R & L bearing cones bind. There is no alternative to repair as all these swingarms have this problem.

First observation is the tube is welded, has ridges & different hardness. I'm limited on tools, no retapping or thread chasing; no micrometer to identify oval or round. I removed the highes & its area threads with a dremel tool.

Second is the cup can wobble trying to start its correct threading. This wobble effect is into the weld, so the out of round is 90" opposite of it.

Hours of trying different cups, all want to cross thread, 2 succeeded in following the tube threads. ALL my day wasted figuring this out. The cup threads are fine, checked all with magnifier, cleaning threads with a fine wire brush too.

Get the alignment correct & the cups are a struggle wrenching. The narrow lips designed for special stamped wrenches are very difficult with an adjustable wrench. An opened end 16mm doesn't contact both surfaces on each side of the axle hole, not deep enough.

The cups are supposed to finger tighten, so I need to adjust the threads to fit a flattened hole. I done so on the left handed cup as it is not the adjustable side. I removed MOST of the thread from the tube, but not all. The cup fit in LOOSELY. So the observation is threads are not undersized, as in cut deep enough in the tube to not bind. The left stationary cup is now permanently seated with glue.

The opposite side needs to adjust, grind & glue isn't a solution. Has anyone else done this? Get a loose enough fit to adjust the cup without stripping? I'm getting an idea, find the indent of the oval first.

Back with that observation. Time for real glasses too, instead of dollar store "magnifiers".

[goinmobile]

I got the crank installed, not right but legal, it can be peddled.

Have you ever installed a sealed bearing cup instead of a loose bearing cup? Glued it in as it will never get changed?

So I adjusted out the clunk, expect resistance to increase as it can only wear wider. 3 bearing contact points, duh.

What temperature does Gorilla Ultimate disintegrate at? Will a liter of gas work or 5 gallons? haha

1. Make note to buy the correct wrench & better designed cups if possible.
2. Figure out the sweet spot to grind off some thread in the tube.
Practice on a different swingarm.
3. Reconsider owning a car.
4. Consider comfort furniture sizing if my apartment was empty of ebikes, parts, tools & all the crap[ that "might" be useful.
5. Should I abandon this ship & find another to sink?

Blast some old hippie tunes until.....

[goinmobile]

Elmers Ultimate glue does not bond metal as claimed on the label. Moisture was used as directed. It has hardened everywhere as expected with its usual slight flex. Varsol cleaned surfaces, the glue failed between the metals, not failed from sticking to metal. 'llI look at this closer later.

Scam or minimum wage labor mixing the ingredients? Scenerio, training the help: "This value is supposed to open for 10 seconds however its an expensive chemical said the accountant, so only open it for 2 seconds". Shareholders are thrilled with year-end profit. The formula inventor is an alcoholic from regret, selling to corporate assholes.

Chapter 2, temporary bandaid to hold bearing in until I get this welded together. Likely cheaper than guenuine metal glue.

If the product story is longer that one statement, don't buy it, its BS. LOL

[cal3thousand]

Elmers Ultimate glue does not bond metal as claimed on the label. Moisture was used as directed. It has hardened everywhere as expected with its usual slight flex. Varsol cleaned surfaces, the glue failed between the metals, not failed from sticking to metal. 'llI look at this closer later.

Scam or minimum wage labor mixing the ingredients? Scenerio, training the help: "This value is supposed to open for 10 seconds however its an expensive chemical said the accountant, so only open it for 2 seconds". Shareholders are thrilled with year-end profit. The formula inventor is an alcoholic from regret, selling to corporate assholes.

Chapter 2, temporary bandaid to hold bearing in until I get this welded together. Likely cheaper than guenuine metal glue.

If the product story is longer that one statement, don't buy it, its BS. LOL

You want to bond metal? Get the DP420 epoxy

[goinmobile]

The temporary solution is pieces of garden hose on the crank, held on by the peddle arms. Crank rides on bearing, works. As long as the crank arm bolts stay on I can fake it.
The 3m glue costs more than welding.