bloke wrote:
- The old York "Monster" small .650" bore was really just 16-1/2 mm...' maybe not real "familiar" to U.S. folk, but conceptually quite familiar to European folk.
FWIW, that York Monster Eb bore would be about a 16 shotgun gauge--a 24J wouild be about 10 guage horn.
So my old Cerveny 601's an 8-gauge ... that explains a few things!
"Don't take life so serious, son. It ain't nohow permanent." -- Pogo (via Walt Kelly)
Rick Denney wrote:
I'm curious as to what Dan (ex-machine tool maker) would think about the .650 tubing. It doesn't line up to fractions of an inch, but I wonder if it lines up with a gauge dimension. Or, maybe it's .75 OD tubing with .05 wall thickness.
Dunno... I find it very difficult to apply logic to most industrial standards. Maybe the .650 ID evolved from generic 11/16" (.6875") OD tubing with a .019" wall thickness. After all... the tough part about making tubing is doing the rolling and and welding. From there all that is necessary is to anneal the tubing and draw it. Draw dies and mandrels are cheap compared to the tubing fabrication equipment. In the case of matching slide tubing, both the inside and outside slide tubes may have begun with the same size tube... with just different draw dies. The only REAL tubing making experience I have is to design some equipment for a company that produces steel tubing for refrigeration. There... the basic requirement is 'how many feet can you make from a pound of steel strip'. Your guess is as good as mine
BTW... I took a look at Machinery's Handbook and the only mention of gage sizes in the production of tubing relates to wall thicknesses. That was Birmingham or Stub's Iron Wire Gage for seamless brass... Brown & Sharp Gage for welded brass... and in Britain, Standard Wire Gage for some steel tubing.
Dan Schultz
"The Village Tinker" http://www.thevillagetinker.com" target="_blank
Current 'stable'... Rudolf Meinl 5/4, Marzan (by Willson) euph, King 2341, Alphorn, and other strange stuff.
