G4000 9'' x 19'' Lathe -13-
FFiigguurree 1122..
Threading rates portion of machine
plate.
FFeeeedd RRaattee
The lever at the bottom of the headstock
changes the feed rate, or the number of threads-
per-inch.
SSeeee FFiigguurree 99..
The lever can be
engaged in any of nine different positions. When
used in conjunction with the interchangeable
gears supplied it is possible to achieve a wide
variety of feed or threading rates.
FFiigguurree 1100..
Feed rate selector lever.
FFiigguurree 1111..
Feed rates portion of machine plate.
The machine plate describes some of the more
typical settings which might be used.
FFiigguurree 1111
shows the feed rate portion of the machine plate.
Looking at the first column, this means that a feed
rate of .0023'' can be achieved by putting the feed
lever in position 9 with a 28 tooth gear installed at
A, and 80 tooth gears at B and C.
Threading feed rates are described in
FFiigguurreess 1122
aanndd 1133..
An 8 thread per inch feed is the result of
having a 60 tooth gear at A, a 30 tooth gear at B,
and the lever in position 1.
A metric 2mm pitch requires the lever to be in
position 7 and would use the same A and B gears
installed above. However the gear between them
changes from a 120 tooth to a 127 tooth. Also
note that the alignment of gears A and B are off-
set so that A now engages the 127 tooth gear and
B engages the 120 tooth gear. The shaft for posi-
tion B is provided with a spacer which can be
installed behind the gear to change its position.
FFiigguurree 1133..
Interchangeable gear positions.
A
B
C
