[TheForge] More air hammer pics up

[Andrew Vida]

Mike Spencer wrote:
> 
> I you're interested in following my progress with overhaul of the
> Alldays & Onions air hammer,  there are some more photos on the web:
> 
>     http://home.tallships.ca/mspencer/shop/alldays2.html
> 
> You guys that are professional riggers will think this is pretty
> Mickey Mouse stuff but I'm tickled that this all worked.  And piston
> rings big enough to make basket ball hoops are a novelty for me.
> 
> No airflow diagrams yet, Frosty, but there are a couple of shots of
> the inside of the valve bore for a start.

	Very cool project, Mike.  The hammer appears to be in rather
	good condition, especially considering it sat out and full
	of water for years.

	As for lube, would a positive pressure affair be desirable?
	I was thinking if you would gun drill the crank with a small
	oil gallery and feed oil through the crank to the bearing,
	you would have a great oiling system.  Two advantages of this
	configuration are very even oil pressure and film at the
	bearing through out the stroke, and with a constant flow of 
	oil away from the bearing, nothing undesirable is likely
	to ever get into it again.  This is the way in which Porsche
	lubricated the crankshafts on the 917.  It allowed the
	comparatively large 5+ liter engine to turn better than
	10K revolutions without problems.  That's very fast for an
	engine of that large a displacement.

	It's probably too much work to justify the expense and
	trouble, but I thought I'd throw it out just for kicks.