Bolt Extraction

[VicParticipant @vic]

I thought this was pretty clever.

[Thor 🇳🇴Participant @thor]

Heat works well for extracting rusted bolts, must save up for a MIG welder.

Thor

[noel shelleyParticipant @noelshelley55608]

Interesting trick to use the copper pipe, the rest is not new. Having worked in both agriculture and marine rusted/ seized bolts are a way of life. That the bolts in ali were done up to 120Ft/Lb I very much doubt, to short a thread and dia . To add to this thread, To remove a bush from a blind hole eg flywheel, fill with grease,use a GOOD fitting punch and drive in – the hydraulic pressure can only go one way – it will push the bush up the punch ! To remove a bearing outer race if normal methods don’t work then run a bead of weld round the inside of the race – it may well fall out, as once molten the metal on soldifying will due to shrinkage become smaller ! Used this one this week on a 7.5″dia bearing !

It all depends what equipment you can lay your hands on as to the method used

A simple spark eroder can be easily be made to get you out of a hole ! Noel

 

[ChrisLHParticipant @chrislh]

Alas Noel, the grease and punch trick doesn’t always work as one would wish. We used it in an attempt to extract an outer ball race from an aluminium gearcase. The result was a beautifully neat aluminium disc pressed from the bore which was no longer blind. The silver lining was that we had access to drift the race out. The job was completed with a new bearing and Araldite.

[noel shelleyParticipant @noelshelley55608]

Hi Chris, may be this was a job where the ring of weld would have been better ? Or even grind through with a die grinder ?  A ring with 3 or 4 holes in and balls with a mandrel to keep the balls in place as you pull on the mandrel. There was a special tool for removing the inner race of BMC 1100 rear wheel bearings that worked on this principal. Noel.

[noel shelley]

On noel shelley Said:

…A ring with 3 or 4 holes in and balls with a mandrel to keep the balls in place as you pull on the mandrel. Noel…

An idea I’ve successfully used a number of times over the years after reading about it in an early issue of MEW (a variation, if there’s a reasonable amount of space on the blind side behind the bearing, is to use a cone shaped mandrel and just drop/poke the balls in around it – I think this might have been what was described in the MEW article).

[ChrisLHParticipant @chrislh]

Nice idea Noel but in this case it was a wafer thin needle roller race so perhaps our accidental method was actually the only way (our [non-existent] welding gear being likely to abuse the ali) ! BMC Allegro idler gear between engine and gearbox if you’re interested.

[SillyOldDufferModerator @sillyoldduffer]

I liked the method, but spotted a few H&S concerns, including:

• Triggering the welder to put gas in a bolt hole whilst holding the earth clamp in the other hand.  (20V is plenty enough to  electrocute a sweaty man.)
• Container of fuel on the bench whilst welding.  (Fireball!)
• Bare arms and a thin T-shirt that provides almost no protection from UV. (Skin cancer in later life)

Quite a few practical Youtube videos contain inadvertent bad practice.   I guess it’s because plenty of what were once industrial only tools are sold without question to innocents!   Shame really, because an otherwise good video missed several chances to demonstrate basic welding precautions.

I always watch out for unwise working methods in Youtube videos, and sometimes find several!

Dave

 

 

[DiogenesParticipant @diogenes]

..you’ll enjoy this..

https://www.youtube.com/watch?v=doBRm7X4czw

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