Grizzly G0516 - Manual (Page 34)

-32- G0516 Lathe/Mill
Changing Speeds
The Model G0516 features 6 speeds—150, 240,
490, 750, 1200 & 2400 RPM. These speeds can
be changed by positioning the V-belt in different
sheaves on the drive pulleys, as illustrated in the
speed change chart on the machine label or in
Figure 49.
Figure 49. Speed change chart.
To change the belt position on the pulleys:
1. Disconnect the lathe/mill from the power
source!
2. Remove the drive belt cover.
3. Loosen the bolt on the tensioner bracket
(shown in
Figure 50) with a 19mm wrench.
Figure 50. Tensioner adjustment bolt.
Figure 51. Checking for proper V-belt tension.
4. Move the pulley bracket away from the belt.
5. Position the belt into the pulley sheaves that
dictate the speed required for your operation.
6. Move the pulley bracket into the belt and ten-
sion it until there is about
1 ⁄
2
" deflection on the
side of the belt that is opposite of where the
tensioner is making contact.
Figure 51
shows how to check for proper tension by
using a ruler and your thumb.
Note—only
moderate pressure is needed to check belt
tension!
7. Replace the drive belt cover.
Some threading operations may damage
the lead screw if performed at high speeds.
Always use the slowest speed possible for
your particular operation!