I'm trying to remove a pivot shaft from a casing and I'm not having much luck. At:
pull this shaft out? What kind of material could I use as
The casing looks like aluminium. If you heat it it will expand more than the steel and the bearings will loosen off. A 2 jaw vice is pretty much useless for gripping anything round. A drill chuck will do a better job.
-- Dave Baker Puma Race Engines
tg submitted this idea :
Put the unit in the freezer for long enough to get it down to -20 C. Make up some hardish wood blocks with a V cut in across the grain to better grip the shaft. Tighten the vice up on the shaft and pour boiling water over the casing to expand it, avoiding heating up the shaft.
The casing will expand faster than the shaft, perhaps making it easier to extract it without damage. An engineer would use dry ice instead of a freezer.
To grip the shaft you could drill a suitable hole in a block of steel or even hard wood, split one side, make a relief for the wire and clamp that in the vice. Heating the casing will make removal easier.
Harry Bloomfield verbally sodomised in news: snipped-for-privacy@tiscali.co.uk:
Or just go to A&E.
some hardish wood blocks with a V cut in across the
boiling water over the casing to expand it, avoiding
extract it without damage. An engineer would use dry
thanks for your response Harry, I tried what you said but this 'f**king thing just will not budge. I froze it overnight, put it in the vice, poured boiling water on the casing and then tried to bash it off as per the manual's instructions. Wouldn't budge. Not one f**king millimeter. I will only hit something so hard and then I draw the line - don't want to break the casing. So after much deep thinking I'm now off down the road to a whizz metalworker bloke I know and see if he can make me a puller tool. I would have gone for this option earlier but everywhere is shut down over Xmas and the New Year.
I haven't seen the original message, however: I think that it would be a better idea to wrap some rags (possibly an old towel) around the casing, in order for it/them to better and longer retain the heat. Just pouring boiling water by itself may not be good enough. I would also try without freezing the shaft, as it might _possibly_ be counter-productive. P.S. I remember fitting a gudgeon pin to a new motorcycle engine piston. When the piston was cold, the pin would not enter _at all_. Having applied the rag soaked in hot water to the piston, allowed the pin to go in without difficulty.
Sylvain.
HomeOwnersHub website is not affiliated with any of the manufacturers or service providers discussed here. All logos and trade names are the property of their respective owners.