Grizzly G0509 - Manual (Page 53)

G0509 & G0509G 16" x 40" Lathe
-51-
to confirm that the bearings are correctly pre-
loaded:
1. Make sure all safety precautions have been
taken and setup steps are complete to make
the lathe fully operational.
2. install the chuck and tighten the jaws.
3. set the spindle speed to its highest setting.
4. Connect the lathe to power and turn the lathe
spindle ON.
5. let the lathe run for 20 minutes.
6. turn the spindle OFF, disconnect lathe from
power, and check the temperature of the
spindle.
—if the spindle nose is hotter than you can
comfortably keep your hand on, the pre-
load is too tight and you must repeat the
bearing preload adjustment procedure.
—if the spindle nose is slightly warm to the
touch, you have correct bearing preload.
now complete
spindle balancing proce-
dure.
spindle balancing
After the spindle has been broken in, or if the lathe
has been used for a considerable amount of time,
you should adjust the spindle weights to minimize
spindle vibration.
to minimize spindle vibration:
1. run the lathe for five minutes on the fastest
rpM.
2. disConnECt lAthE FroM poWEr!
3. open the side cover, loosen the counter
weight set screws ( figure 73), and reposition
one or both counterweights to a new posi-
tion around the circumference of the spanner
nut.
figure 73. spindle counterweights.
4. Close the side cover, reconnect to power,
restart the lathe, and run at 900 rpM.
5. place your hand on the headstock cover and
feel for harmonic vibration.
6. repeat steps 2–5 until vibration is reduced
to a minimum.
7. now, repeat steps 2–5 at 1800 rpM until
vibration is reduced to a minimum.
Counterweight
set screw