Feed Rate - Grizzly G4000 Instruction Manual

F F e e e e d d R R a a t t e e
The lever at the bottom of the headstock
changes the feed rate, or the number of threads-
per-inch. S S e e e e F F i i g g u u r r e 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 F i i g g u u r r e e 1 1 0 0 . . Feed rate selector lever.
The machine plate describes some of the more
typical settings which might be used. F F i i g g u u r r e e 1 1 1 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 F i i g g u u r r e e s s 1 1 2 2
a a n n d d 1 1 3 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.
G4000 9'' x 19'' Lathe
F F i i g g u u r r e e 1 1 1 1 . . Feed rates portion of machine plate.
F F i i g g u u r r e e 1 1 2 2 . . Threading rates portion of machine
plate.
F F i i g g u u r r e e 1 1 3 3 . . Interchangeable gear positions.
A
C
B
-13-