[tg]

I'm trying to remove a pivot shaft from a casing and I'm not having much luck. At:
http://www.zen73857.zen.co.uk/shaft/shaft.htm
there are pictures to make things clearer. Is there a tool I can use to pull this shaft out? What kind of material could I use as
vice jaw protectors, but will still grip the shaft?
Thanks for any help.

[Dave Baker]

"tg" wrote in message
...
I'm trying to remove a pivot shaft from a casing and I'm not having much
luck. At:
http://www.zen73857.zen.co.uk/shaft/shaft.htm
there are pictures to make things clearer. Is there a tool I can use to
pull this shaft out? What kind of material could I use as
vice jaw protectors, but will still grip the shaft?
Thanks for any help.

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
www.pumaracing.co.uk
Camp USA engineer minces about for high performance specialist (4,4,7)

[Harry Bloomfield]

tg submitted this idea :
I'm trying to remove a pivot shaft from a casing and I'm not having much
luck. At:
http://www.zen73857.zen.co.uk/shaft/shaft.htm
there are pictures to make things clearer. Is there a tool I can use to pull
this shaft out? What kind of material could I use as vice jaw protectors, but
will still grip the shaft?
Thanks for any help.

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.

--

Regards,
Harry (M1BYT) (L)
http://www.ukradioamateur.co.uk

[mrcheerful .]

"tg" wrote in message
...
I'm trying to remove a pivot shaft from a casing and I'm not having much
luck. At:
http://www.zen73857.zen.co.uk/shaft/shaft.htm
there are pictures to make things clearer. Is there a tool I can use to
pull this shaft out? What kind of material could I use as vice jaw
protectors, but will still grip the shaft?
Thanks for any help.


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.

[Phil Kyle]

Harry Bloomfield verbally sodomised in
:



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.


Or just go to A&E.

--
Phil Kyle™

T
h i
i s
s l
f i l
S o n o
i u e n
g r s g

[tg]

"Harry Bloomfield" wrote in message ...

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.

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.

[Sylvain VAN DER WALDE]

"tg" wrote in message
...

"Harry Bloomfield" wrote in message
...

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.

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.