Gearbox Levers; Feed Rate Chart - Grizzly g4003g Owner's Manual

gearbox levers

NOTICE
never move levers while the lathe is run-
ning, and never force any lever when shift-
ing. if the lever will not engage, rotate the
chuck by hand while keeping light pressure
on the lever. as the chuck rotates it aligns
the gears and the lever will engage.
the two levers (figure 28) at the bottom of the
headstock change the feed rate, or the number of
threads cut per-inch. the left-hand lever engages
in alpha positions a, b, c, d, and e; and the right-
hand lever engages in numeric positions 1, 2, 3,
4, 5, 6, 7, and 8.
use the feed rate chart shown in figure 29 to
position the quick change gearbox levers.
figure 28. Quick change gearbox.
to change the position of the feed selector, pull
the knurled handle. this disengages a pin which
is inserted into a selection hole. position the lever
in the down position and slide to the right or left
until it is positioned below the desired selection
hole. raise the lever with one hand while pulling
the handle with the other. the pin at the end of the
lever should align with the selection hole. if it does
not, rotate the feed rod or chuck by hand while
maintaining gentle pressure on the lever.
Model g4003g (Mfg. since 4/08)

feed rate chart

the far left column in the feed rate chart (figure
29) shows which change gears must be installed
so the chart will be accurate.
to make a longitudinal cut in inches, use the
bottom portion of the chart. if the desired feed
rate is 0.0062"/revolution, look at the longitudinal
ranges.
According to the chart we would put the left-hand
lever in the c position and the right-hand lever in
the 4 position. Metric calculations would be done
the same way but you would use the upper half
of the chart. to perform a cross feed cut with a
feed rate of 0.0013" move the left-hand lever to
the d position and the right-hand lever to the 1
position.
please note that when either of the two selector
levers are left in the down position, the drive train
downstream from this point is in neutral.
29
figure . feed rate chart.
this symbol indicates longitudinal feed.
this symbol indicates cross feed rates.
-29-