Grizzly G9249 - Manual (Page 57)

g9249 12" x 37" Belt drive gap Bed lathe
-55-
Operations
symptom possible Cause possible solution
Bad surface finish. 1. incorrect spindle speed or feed rate.
2. dull tool or poor tool selection.
3. too much play in gibs.
4. tool too high.
1. Adjust for proper spindle speed and feed rate ( Page
34).
2. use sharp tools; use correct tool for the operation.
3. Adjust gibs (
Page 56).
4. lower tool position.
Cannot remove
tapered tool from
tailstock quill.
1. Quill not retracted all the way back into the
tailstock.
2. debris/oil not removed from tapered mating
surfaces before inserting into quill.
1. rotate the quill handwheel until the tapered tool is
forced out of quill.
2. Always make sure that tapered mating surfaces are
clean before inserting.
gear(s) will not line
up and mesh. 1. gear(s) not aligned in headstock. 1. rotate spindle by hand until gear(s) falls into place.
Cutting tool
or machine
components vibrate
excessively during
cutting.
1. tool holder not tight enough.
2. Cutting tool too far out from holder; lack of
support.
3. too much play in gibs.
4. Cutting tool is dull.
5. incorrect spindle speed or feed rate.
1. Check for debris, clean, and re-tighten.
2. re-install cutting tool with no more than
1 ⁄
3
of total
length is sticking out of tool holder.
3. Adjust gibs ( Page 56).
4. sharpen/replace.
5. Adjust for proper spindle speed and feed rate (
Page
34).
Cr o s s /c o m p o u n d
slide or carriage
feed has sloppy
operation. 1. too much play in gibs.
2. handwheel(s) loose.
3. too much leadscrew backlash (cross slide
only).
4. leadscrew mechanism worn or out of
adjustment.
1. Adjust gibs ( Page 56).
2. tighten handwheel fasteners.
3. Adjust leadscrew backlash (
Page 57).
4. tighten any loose fasteners on leadscrew
mechanisms; check for excessive wear/replace if
necessary.
Cr o s s /c o m p o u n d
slide or carriage
feed hard to move. 1. gibs are loaded up with chips/grime.
2. gibs are too tight.
3. leadscrew backlash setting too tight (cross
slide only).
4. Bedways are dirty/dry.
5. gearing is at fault.
1. remove gibs, clean ways, lubricate, and properly
adjust gibs ( Page 56).
2. Adjust gibs ( Page 56).
3. properly adjust cross slide leadscrew backlash
( Page 57).
4. Clean and lubricate bedways.
5. inspect/replace gearing.
inaccurate turning
results from one end
of workpiece to the
other. 1. tailstock not properly aligned with
headstock.
1. properly align tailstock with headstock ( Page 28).
Chuck jaws will
not move or do not
move easily. 1. Chips/debris lodged in jaws. 1. remove jaws, clean and lubricate jaws, scroll-gear
threads, and chuck, then replace jaws.
tailstock quill will not
feed out of tailstock. 1. Quill lock is tightened down. 1. turn quill lock counterclockwise to loosen.