Grizzly G4000 - Manual (Page 14)

G4000 9'' x 19'' Lathe -13-
F Fiig gu urre e 1 12 2.. Threading rates portion of machine
plate.
F Fe ee ed d R Ra atte e
The lever at the bottom of the headstock
changes the feed rate, or the number of threads-
per-inch.
S Se ee e F Fiig gu urre e 9 9.. 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.
F Fiig gu urre e 1 10 0.. Feed rate selector lever.
F Fiig gu urre e 1 11 1.. Feed rates portion of machine plate.
The machine plate describes some of the more
typical settings which might be used.
F Fiig gu urre e 1 11 1
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 F Fiig gu urre es s 1 12 2
a an nd d 1 13 3.. 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.
F Fiig gu urre e 1 13 3.. Interchangeable gear positions.
A
B
C