Welding the cog

yay
;-)

If you can't do it with duct tape and cable ties, you haven't used enough.

yay
;-)

You should flip the whole drivetrain onto the left hand side of the bike. That way, when the cog eventually unwinds itself, your braking action (ie. slowing down the pedals) will wind the cog back on, allowing you to 'safely' stop*.

*Don't actually do this.

If you can't do it with duct tape and cable ties, you haven't used enough.

and a drop of super glue never gose a miss

blu tac

^ Repost

Blu-Tack

Welding ali to steel not good

I have in the past repaired many vintage and veteran bikes and the only way to succesfully repair an alluminium thread is to build it up employing the tig welding process and then remachine the thread to standard. If one tries to weld aluminium to steel it will not sucessfully produce any type of good weld. The steel has a higher temperature of melting point and the ali has a lot lower, the steel has carbon in it and the ali dose not, hence a crummy weld with no strength. This is what 30 years of welding has tought me

I have in the past repaired many vintage and veteran bikes and the only way to succesfully repair an alluminium thread is to build it up employing the tig welding process and then remachine the thread to standard. If one tries to weld aluminium to steel it will not sucessfully produce any type of good weld. The steel has a higher temperature of melting point and the ali has a lot lower, the steel has carbon in it and the ali dose not, hence a crummy weld with no strength. This is what 30 years of welding has tought me

he was talking about using an alu cog like the token ones. but when on-one are turning out hubs for £15, its all theoretical/pointless/etc.

If one tries to weld aluminium to steel it will not sucessfully produce any type of good weld

Although it's irrelevant/theoretical/pointless/etc., friction welding of aluminium alloys to various steels can produce a weld stronger than the aluminium alloy, i.e. the aluminium alloy fractures before the joint if you pull it apart.