Re: How do they make rose bearings?


<jontom_1uk@xxxxxxxxxxx> wrote in message
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On 29 Jun, 11:34, "Andrew Mawson"
<andrew@xxxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
"MikeH_QB" <MikeHur_2...@xxxxxxxxxxx> wrote in message

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On 28 Jun, 12:43, dave sanderson <david.sander...@xxxxxxxxxxxxxx>
wrote:
Andrew Mawson wrote:
On the end of hydraulic cylinders there is usually a spherical
rose
bearing welded on to the ram to take out missalignment as it
operates.
Consists of a ring with a female double truncated spherically
turned
surface, and a male double truncated sphere (a bit like the
world
sliced off at the tropics of Cancer and Capricorn) axially
bored
(through the poles to continue the analogy) to take the
mounting
pin.

How the heck do they get the male part inside the female part
???? (no
crude comments please!)

AWEM

With a big press. the outer is 'formed' over the inner. it
starts
as a
cylinder, which the inner slides into, then the cupped edges are
formed by pressing the end of the cylinder in.this is why you
should
only use them for loads in the radial direction not axial (might
have
that backwards) as the ball can pop out.
sometimes the outer is fitted by injecting polymer into the gap
and
then flanging over thinner 'shields'

Dave

Basically then - if in doubt, hit it with a big hammer!

Turns out that on these particular rose bearings that I'm dealing
with
(a 1986 Thwaites dumper truck steering ram) the inner bearing
element
(the 'double truncated globe with a boring through the poles') is
available as a separate part, and the female enclosing bearing
element
has two slots milled so the item can be popped in and out by
rotating
the truncations to line up with the slots. That's the good news. The
bad news is Thwaites want £39 plus vat each !!! So the hunt is on
for
the OEM <G>

AWEM- Hide quoted text -

- Show quoted text -

Andrew, you surprise me, is that not what lathes and ball turning
tools were made for?

I have a couple of ex aircraft "inners" somewhere in a box but I
think that they would be about 1.25" diameter, possibly 5/16" thick
for a 3/8" bolt, so fear they will be too small for you. If not let me
know and I will try and find them and measure properly.

Regards

Keith


Kind Keith, yes I had considered that, and at the time of writing the
lathe is still in comission, but most of the workshoop is now
palletised ! The bore for the pin on these is about 25mm and I'm
waiting for the rain to stop to pull 'em out and measure them
properly.

AWEM


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