thread repairs

[weareHKR]

Or would it be possible to fill the hole with weld, flatten off then drill and retap the thread?

Wouldn't the weld/frame join be a weak spot?

Yes, it could be filled in with a decent welder, it wouldn't weaken it if it's done properly.
Having said that I would still rather tap it out...

 

[C R]

Yes, it could be filled in with a decent welder, it wouldn't weaken it if it's done properly.
Having said that I would still rather tap it out...

I was thinking that when filling, after redrilling and retapping, there's not going to be much left of the weld fill, just the thread ridges, which would mean stripping the thread would be quite easy.

 

[fossyant]

I'd go with the hanger outlined earlier TBH. It will be stronger.

 

[C R]

I'd go with the hanger outlined earlier TBH. It will be stronger.

I agree, it looks like the easiest and least problematic option.

 

[DRM]

I was thinking that when filling, after redrilling and retapping, there's not going to be much left of the weld fill, just the thread ridges, which would mean stripping the thread would be quite easy.

There would be no thread left, you would be tapping fresh metal, the hole would be smaller than the original hole to tap new threads into it.

 

[themosquitoking]

This might be too simple but have you tried threading the bolt in from the reverse side to see if that can sort it out?

 

[silva]

A weld harms quite some mechanical properties of steel in case the steel was given certain crystalline structures when produced.

 

[davidphilips]

Dropout saver? Costs about £8 delivered from fleebay. https://www.google.com/search?q=der...me&ie=UTF-8#kpvalbx=_KKuIX8O3MciDhbIP39iRiAs8

 

[piglet]

Hi BinyamIn I am anew member so you have probably solved your dropout problem but here's goes.1,cut off the existing gear hanger from dropout and then use a bolt on hanger.or a neater solution is to cut off hanger from dropout,fix the bolt on hanger mark the hanger on the reverse side under the dropout remove bolt On hanger from frame and cut hanger along your mark .The gear part can then be welded to the dropout .This is a straight forward job for competent local welders shop.It was common mod in the early days of campag gears .I had it done 60 years ago.Hope this helps.