First remove the shaft assembly off the lathe. Now we limit the damage
to the machine. (Don't ask how I learned this!)
Place the shaft over a short pipe. I used a PVC cut-off that was 25 or
30 mm long. It was just the right diameter.
A few squirts of penetrating oil to give it some lube. Then a drifter
was used that fitted to the bottom of the threaded hole and drifted
gentle it out.
An alternative is to place a suitable bolt in the threaded portion and
strike that. I did not have a suitable bolt hence my drifting from the
bottom of the hole to protect the thread. The danger is you can break
the bottom out of the hole which is bad.
A third alternative which I feel might make the situation worse is to
have a drifter that fits the 8mm hole of the bush. I avoided this method
as I felt if it stated to mushroom the metal of the shaft it would
expand onto the bushing or reduce the opening of the threaded portion.
Just my 5 cents.
Andrew in Melbourne.
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On Sun, 2011-10-09 at 11:28 -0700, Ian Newman wrote:
Hi,
You could try gently heating the stud/gear combination in the hopes
that the thermal expansion will break the bond.
Ian.
--- On Sun, 9/10/11, jaspercan7 <jaspercan7@...> wrote:
From: jaspercan7 <jaspercan7@...>
Subject: [7x12minilathe] Re: shaft and bushing for the B/C
change gears
To: 7x12minilathe@...
Date: Sunday, 9 October, 2011, 17:47
I should be more specific. In addition to suggestions to keep
it from happening again, are there any recommendations for
non-destructive ways of separating the stuck bushing from the
shaft?
--- In 7x12minilathe@..., Jerry Durand
<jdurand@...> wrote:
>
> polish shaft and use more lithium grease?
>
> On 10/09/2011 09:17 AM, jaspercan7 wrote:
> > I was doing some general turning under power feed
yesterday, nothing elaborate, and all of a sudden the lathe
stalled. After much investigation I finally diagnosed the
problem: the B/C gear bushing has somehow fused or stuck
itself to the B/C gear shaft on which it rides. Seems
absolutely welded. Right now I have it soaking in wd40.
> > Anyone had a similar problem and can give any advice?
> > Thanks,
> > Paul
> >
> >
>
> --
> Jerry Durand, Durand Interstellar, Inc. www.interstellar.com
> tel: +1 408 356-3886, USA toll free: 1 866 356-3886
> Skype: jerrydurand
>
