[TheForge] Re: More air hammer pics up

[Mike Spencer]

me> I hope not to take the crank out...

Andy> I understand your reluctance.  Then how about a flexible
Andy> hose from a tank to a fitting in the rod?

Yes.  I have two possibiliteis in mind:

    No pump: a copper tube replaces the small end grease cup and runs
    from the grease cup hole down the conrod to a zirk fitting near the
    big end.  Have to stop the hammer to grease it.

    Pump: Same but flexible hose to the oil pump instead of the zirk
    fitting.

Andy> How is the big end bearing oiled now?

Came with a thing resembling a grease cup but is, I think, an oil
reservoir that oiled the big end bearing by having the crank motion
slosh a little oil into a stand pipe on each turn.  Not very elegant.
And you can see in the photo that someone drilled into the big end
bearing and installed a zirk fitting (but didn't groove the bearing to
spread the grease across its width.)

If the I can come up with an oil pump, I'll try to use it for both
ends.  Otherwise, I'll use the grease fitting that's there for the big
end.

Later models of the A&O apparently came with a cam-operated oiler pump
and that's what is shown in the blueprint I got from England but it's
short on detail for the pump.

So far as I can see, the tup and piston are lubed from a manual pump
that squirts oil into the valve body where, presumably, the air flow
spreads it around.  You just have to go and give it a squidge once in
a while.  Must work at least fair to middlin' or the rings and whatnot
wouldn't be in as good shape as they are.

- Mike

-- 
Michael Spencer                  Nova Scotia, Canada 
                                 
mspencer@tallships.ca            
http://home.tallships.ca/mspencer/