Trouble Shooting

Powerfeed and Thread Cutting
1. Powerfeed does not move carriage
Cause Solution
• Carriage locked 
• Unlock carriage
• Speed selector not engaged
   drive selector
• Select speed I or II
 
• Sheared pin 
• Replace pin
• Gears not meshing or teeth
   missing
• Check gears and mesh 
 
• Sheared dog on eccentric
• Replace eccentric
   
2. Cut is not smooth  
Cause    Solution
• Tool dull 
• Sharpen or replace tool
• Tool not on center  
 
• Center tool
   (shim, if needed)
• Tools not mounted tightly in
   post
• Remount tools
 
• Cross slide gibs to bed and
   base loose
• Adjust gibs 
 
• Gibs in toolpost loose 
• Adjust gibs in toolpost
• Tool turret not tight
• Tighten toolpost
• Feed rate too fast
• Install correct gears
• Gears loose
• Tighten gears and posts
   
3. Thread is not smooth  
Cause     
Solution
• Tool dull  
• Sharpen tool
• Tool not centered
• Center tool
• Tools not mounted tight in
   post
• Remount tools
 
• Cross slide gibs to bed and
   base loose
• Adjust gibs 
 
• Gibs in compound loose
• Adjust gibs
• Tool turret not tight
• Tighten toolpost
• Gears loose
• Tighten gears and posts
   
4. Tool is not cutting “on thread”  
Cause   Solution
• Powerfeed not fully engaged
•  Keep powerfeed enganged
   
Carriage/Milling Table
   
1. Table won't move  
Cause Solution
• Table locks engaged
• Loosen locks
• Gibs too tight
• Loosen gibs
   
2. Horizontal movement in cross-slide table
 
Cause     Solution
• Carriage gib improperly
   adjusted
• Adjust carriage gib
 
• Table gib improperly adjusted
• Adjust table gib
   
3. Vertical movement in cross-slide table  
Cause  Solution
• Carriage gib improperly
   adjusted
• Adjust carriage gib
 
• Table gib improperly adjusted
• Adjust table gib
   
4. Carriage moves smoothly in only one direction
 
Cause Solution
• Debris on way or gib  
• Remove debris
• Burr on gib
• Remove burr with fine file
• Gib improperly tensioned
• Loosen gib and re-tension
• Excessive space between bearing
                and dial
• Add shim washers
 
   
Lathe Turning
   
1. Clutch drops into neutral while turning  
Cause Solution
• Too much gap between jaw
   clutch and left jaw clutch
• Shorten the shaft sleeve
 
   
2. Cut is rough  
Cause  Solution
• Tool dull
• Sharpen or replace tool
• Tool not ground properly
• Regrind tool
• Tool at wrong angle
• Correct tool position
• Tools not held tightly
• Tighten toolholder
• Wrong cutter for material
• Use correct cutter
• Cutting speed incorrect
• Increase or reduce speed
   
3. Work has unwanted taper  
Cause  Solution
• Work improperly aligned
• Realign centers on work
• Debris in spindle, setup,
   or tools
• Clean and reset setup, work, or tool
 
• Offset tailstock incorrectly
   positioned
• Correct position of tailstock
 
• Spindle out of alignment
 
 
 
• Tighten taper bearings to
   return to
   alignment, replace spindle
   bearings
   
4. Machine vibrates
 
Cause  Solution
• Work mounted wrong
• Remount work
• Speed too high
• Reduce speed
• Too much pressure at
   tailstock
• Reduce pressure and
   increase lubrication
   
5. Work stops turning but machine continues to run
 
Cause
Solution
• Work not mounted securely
• Remount work
• Tools forced into work
• Reduce force on tools
• Belts slipping
 
• Tension belts, use belt
   dressing, or replace  belts
   
6. Diameter of work is not consistent
 
Cause  Solution
• Too much flex in workpiece
• Use a follow rest
• Too much flex in compound
   rest, crosslide, or carriage
• Tighten gibs, clean ways
 
  
 
7. Too much backlash in compound  
Cause     Solution
• Loose spanner nuts 
• Tighten Spanner Nuts
• Worn nut  
• Replace nut
   
8. Machine slings oil from behind the chuck or in belt box
 
Cause  Solution
• Oil reservoir overfilled
• Check oil level
• Worn oil seal
• Replace oil seal
   
Milling
   
1. Tool chatters  
Cause Solution
• Gibs too loose on cross
   slide, compound or carriage
• Readjust gibs or carriage
• Unused feeds not locked
• Lock all axes but the one moving
• Milhead not locked
• Lock millhead
• Quill too loose
• Tighten quill lock
• Tool not on center
• Center Tool
• Improper tool shape, too dull
• Reshape, sharpen,
   or replace tool
   
2. Depth of cut is not consistent  
Cause Solution
• Quill moving
• Lock Quill
• Setup wrong
 
• Make sure setup is  parallel
   to table
   
Drilling
 
1. Hole is off center or bit wanders
Cause  Solution
• Bit Dull
• Use Sharp Bit
• Bit not mounted
   correctly in chuck
• Remount Tool
 
• Bit Bent
• Replace Bit
• Chuck loose in spindle
 
• Remount chuck on arbor
• Drawbar not secured
• Tighten Drawbar
• Debris on Spindle
 
• Clean debris and arbor
   and remount tool
• Bearing loose or worn
• Tighten or replace bearings
• Cutting too fast
• Reduce speed
• Incorrect bit
• Use correct bit
   
2. Entrance hole is out of round  
Cause Solution
• Bit dull
• Use sharp bit
• Incorrect drill bit
• Use correct bit
   
3. Bit turns erratically or stops  
Cause  Solution
• Bit fed into work too fast
• Reduce feed rate
• Belts slipping 
 
• Reduce feed rate,
   re-tension belts
   
4. Chuck is difficult to tighten or loosen
 
Cause Solution
• Chuck sticking
• Apply lubricant
• Debris in chuck
• Clean chuck
   
5. Chuck wobbles  
Cause  Solution
• Chuck loose on arbor
• Clean arbor and remount
• Drawbar not tight
• Clean spindle and replace drawbar
   
Drive System
   
1. Turn on machine and nothing happens
 
Cause  Solution
• Machine unplugged
• Plug in machine
• Loose electrical connections
• Tighten wiring connections
2. Motor and pulleys turn, but not lathe ore mill
 
Cause
Solution
• Lathe mill clutch is in neutral
• Pull the clutch sleeve all the way out (lathe) or push it all the way in (mill)
3. Pulleys turn and clutch is engaged but the mill does not turn
 
Cause
Solution
• T-key missing
• Replace key
• Bevel gear stripped or broken
• Replace bevel gear
• Bevel gear out of adjustment
• Readjust bevel gear

For Assistance: Call Toll Free 1-800-476-4849

Or Visit www.smithy.com

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