Using Spindle Downfeed Controls - Grizzly G0757Z Owner's Manual

5.
Arrange V-belts for desired horizontal spindle
speed (see Figure 37).
Note: Horizontal spindle speed chart shown
below is also on side of column.
Horizontal Spindle Speeds
RPM
72 A – G
170 B – G
210 C – G
240 A – F
290 A – E
550 B – F
830 C – E
1300 B – D
Figure 37. Horizontal spindle speed chart.
6. Apply pressure on lower idler pulley to left as
you tighten tension thumbwheel.
Note: There is proper V-belt tension when
approximately ⁄ " –
1
4
by applying moderate pressure midway
between pulleys as shown in Figure 38.
⁄ "– ⁄ "
1 1
4 2
Deflection
Figure 38. Checking V-belt tension.
7.
Retighten hex nut behind lower idler pulley
bracket.
8.
Close and latch V-belt cover.
Model G0757Z (Mfd. Since 02/15)
Upper
D
E
F
G
C
B
A
Motor
⁄ " deflection is achieved
1
2
Pulley
Pulley
Using Spindle
Downfeed Controls
Use Figure 39 and the descriptions below to
understand the downfeed components that con-
trol the 5" spindle downfeed travel.
Fine
Downfeed
Handwheel
Quill
Lock
Figure 39. Spindle downfeed controls.
Coarse Downfeed Levers: Manually control
downfeed travel in a rapid manner. Generally
used for drilling operations. Spindle automatically
returns to top position when pressure is released
from the handle.
Fine Downfeed Handwheel: Manually controls
downfeed travel in a slow, precise manner. Unlike
coarse downfeed, spindle does not automatically
retract. The attached graduated dial has incre-
ments of 0.001" with one full revolution represent-
ing 0.100" of travel. Generally used for milling
operations.
Selection Lever: When tightened, enables the
fine downfeed handwheel; conversely, when loos-
ened enables the coarse downfeed levers.
Quill Lock: Secures the quill in place for increased
stability during milling operations.
Selection
Lever
Coarse
Downfeed Lever
-37-