On Thursday, August 27, 2020 at 12:31:45 PM UTC-4, Steve W. wrote:
Jim Wilkins wrote:
"pmailkeey" wrote in message
...

On Sunday, 4 January 2004 at 22:39:09 UTC, Leo Lichtman wrote:
Cliff Knight wrote: Correct, "swing" in machine tool talk is radius (like
a swing hanging from a tree.(CLIP)
^^^^^^^^^^^
Cliff, too bad you didn't stop right after the word "correct." Pal had it
right, so "correct" is correct. But swing is not a radius. The radius of
the maximum size his lathe will turn is 3"--the swing is 6", the DIAMETER.
The illustration of a swing hanging from a tree merely adds to the error
of
calling the radius the swing.

'Swing' is the radius, not diameter. Think of how long a pendulum would be
swinging from the spindle. Same wrt crank length on a crankshaft.

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https://ozarktoolmanuals.com/ozarksh...r-metal-lathe/



Just don't forget that there is swing over bed and swing over carriage,
which are usually VERY different. On a wood lathe you get more room
because there is no carriage in the way. So be sure to ask which swing
you are talking about on a metal lathe. A machine that can swing 20"
over the bed but only 16" over the carriage isn't going to work to turn
that 18" chunk of steel.

--
Steve W.

Some time ago we had a job to turn a 20 inch by 6 foot chunk of steel on a Monarch lathe with 18.5 inch over the carriage. The first cut was 1 inch deep to get to 18 inch diameter to go over the carriage. The chip was about 100 feet long before the operator broke it deliberately, deep and slow pass but it worked perfectly.