Grizzly G0779 User Manual

Model G0779 (Mfd. Since 09/14)

-35-

Tool loose in spindle. 1.  Tool is not fully drawn up into spindle taper.

2.  Debris on tool or in spindle taper
3.  Taking too big of a cut.

1.  Tighten drawbar.
2.  Clean tool and spindle taper.
3.  Lessen depth of cut and allow chips to clear.

Breaking tools.

1.  Spindle speed/feed rate is too fast.

2.  Tool is too small.
3.  Tool getting too hot.
4.  Taking too big of a cut.
5.  Spindle extended too far down.

1.  Set spindle speed correctly or use slower feed rate 

(

Page 25).

2.  Use larger tool.
3.  Use coolant or oil for appropriate application.
4.  Lessen depth of cut and allow chips to clear.
5.  Fully retract spindle and lower headstock. This 

increases rigidity (

Page 21).

Workpiece or tool 
vibrates or chatters 
during operation.

1.  Table locks not tight.
2.  Workpiece not secure.
3.  Spindle speed/feed rate is too fast.
4.  Spindle or quill extended too far down.

5.  Quill lock lever not tight.

1.  Tighten table locks (

Page 20).

2.  Properly clamp workpiece on table.
3.  Set spindle speed correctly (

Page 25).

4.  Fully retract spindle and lower headstock. This 

increases rigidity (

Page 21).

5.  Tighten quill lock lever (

Page 24).

Table is hard to 
move.

1.  Chips have loaded up on rack and pinion.

1.  Frequently clean away chips that load up during 

operations.

Headstock is hard to 
raise.

1.  Headstock lock nuts at fault.
2.  Rack and pinion at fault or jammed with 

grime/debris.

1.  Loosen/replace lock nuts.
2.  Fix/replace broken or loose parts; clean and 

lubricate rack and pinion.

Bad surface finish.

1.  Spindle speed is too fast.
2.  Dull or incorrect cutting tool.

3.  Wrong rotation of cutting tool.
4.  Workpiece not secure.
5.  Spindle extended too far down.

1.  Set spindle speed correctly (

Page 25).

2.  Sharpen cutting tool or select one that better suits 

the operation.

3.  Check for proper cutting tool rotation.
4.  Properly clamp workpiece on table.
5.  Fully retract spindle and lower headstock. This 

increases rigidity (

Page 21).

Spindle overheats.

1.  Drill operated at high speeds for extended 

period.

1.  Allow drill to cool.

Spindle does not 
return to highest 
position.

1.  Poorly adjusted return spring.
2.  Worn return spring. 

1.  Increase return spring tension (

Page 36).

2.  Replace return spring.

Depth stop pro-
ducing inaccurate 
results.

1.  Depth stop not calibrated.

1.  Calibrate depth stop (

Page 36).