Grizzly g0746, g0749 owner manual Lathe Operation

Page 78

Lathe Operation

Symptom

Possible Cause

Possible Solution

Entire machine

1.

Workpiece is unbalanced.

1.

re-install workpiece as centered with the spindle

vibrates upon

 

 

 

bore as possible.

startup and while

2.

loose or damaged V-belt(s).

2.

re-tension/replace the V-belt(s) as necessary (see

running.

 

 

 

Page 81).

 

3.

V-belt pulleys are not properly aligned.

3.

align the V-belt pulleys.

 

4.

Worn or broken gear present.

4.

inspect gears, and replace if necessary.

 

5.

Chuck or faceplate is unbalanced.

5.

re-balance chuck or faceplate; contact a local

 

 

 

 

machine shop for help.

 

6.

gears not aligned in headstock or no

6.

adjust change gears and establish backlash.

 

 

backlash.

 

 

 

7.

Broken gear or bad bearing.

7.

replace broken gear or bearing.

 

8.

Workpiece is hitting stationary object.

8.

stop lathe immediately and correct interference

 

 

 

 

problem.

 

9.

spindle bearings at fault.

9.

reset spindle bearing preload or replace worn

 

 

 

 

spindle bearings.

 

 

 

 

 

Bad surface finish.

1.

Wrong spindle speed or feed rate.

1.

adjust for appropriate spindle speed and feed rate.

 

2.

dull tooling or poor tool selection.

2.

sharpen tooling or select a better tool for the

 

 

 

 

intended operation.

 

3.

tool height not at spindle centerline.

3.

adjust tool height to spindle centerline (see Page

 

 

 

 

49).

 

4.

too much play in gibs.

4.

tighten gibs (see Page 79).

 

 

 

 

 

Tapered tool difficult

1.

Quill is not retracted all the way back into

1.

turn the quill handwheel until it forces the tapered

to remove from

 

the tailstock.

 

tool out of quill.

tailstock quill.

2.

Contaminants not removed from taper

2.

Clean the taper and bore, then re-install tool.

 

 

before inserting into quill.

 

 

 

 

 

 

 

Cross slide,

1.

gibs are out of adjustment.

1.

adjust gibs (see Page 79).

compound rest, or

2.

handwheel is loose or backlash is high.

2.

tighten handwheel fasteners, adjust handwheel

carriage feed has

 

 

 

backlash to a minimum (see Page 78).

sloppy operation.

3.

leadscrew mechanism worn or out of

3.

adjust leadscrew to remove end play (see Page

 

 

adjustment.

 

79).

 

 

 

 

 

Cross slide,

1.

dovetail ways loaded with shavings, dust,

1.

remove gibs, clean ways, lubricate, and re-adjust

compound,

 

or grime.

 

gibs.

or carriage

2.

gibs are too tight.

2.

loosen gibs slightly (see Page 79), and lubricate

handwheels hard to

 

 

 

bedways.

move.

3.

Backlash setting too tight.

3.

slightly loosen backlash setting (see Page 78).

 

4.

Bedways are dry.

4.

lubricate bedways/ball oilers.

 

 

 

 

 

Cutting tool

1.

tool holder not tight enough.

1.

Check for debris, clean, and re-tighten.

or machine

2.

Cutting tool sticks too far out of tool holder;

2.

re-install cutting tool so no more than 1⁄3 of the total

components vibrate

 

lack of support.

 

length is sticking out of tool holder.

excessively during

3.

gibs are out of adjustment.

3.

adjust gibs at affected component (see Page 79).

cutting.

4.

dull cutting tool.

4.

replace or resharpen cutting tool.

 

5.

incorrect spindle speed or feed rate.

5.

Use the recommended spindle speed and feed rate.

 

 

 

 

 

-76-

Model G0746/G0749 (Mfg. Since 3/13)

Page 77 Page 79
Image 78
Page 77 Page 79
Contents GEAR-HEAD Lathe Page Table of Contents 113 117Introduction Machine Description Manual AccuracyContact Info Identification Master Power Switch Controls ComponentsCarriage TailstockControl Panel Safety Foot Brake End GearsMachine Data Sheet Tailstock Info Construction Model G0749 16 X 40 Heavy Duty Lathe 13-3/4 12.75 qt Safety Safety Instructions for MachineryPage Additional Safety for Metal Lathes Additional Chuck Safety Availability Full-Load Current RatingCircuit Requirements for Connection Type Correcting Phase PolarityTo correct the phase polarity of the incoming power supply Grounding InstructionsPreparation SetupNeeded for Setup UnpackingInventory Main Components Figure QtyPackaged Components Figure Cleanup Before cleaning, gather the followingBasic steps for removing rust preventative Site Considerations Lifting & Placing HEAvy LifTTo lift and move the lathe Anchoring to Floor Leveling Anchoring to Concrete FloorsMachine Base Concrete Assembly Location of headstock jack screwsLubricating Lathe Power Connection Adding CoolantTest run consists of verifying To connect lathe to powerTest Run To test run your machineEmergency Feed LeverRecommended Adjustments Factory adjustments that should be verifiedSpindle Break-In Operations Operation OverviewTo install the camlock studs Chuck & PlateInstallation Removal Devices Chuck InstallationTo install the chuck Registration Marks Registration mark locationsChuck Removal Scroll Chuck ClampingTo remove the chuck Changing Jaw Set To change the jaw setJaw Chuck Mounting WorkpieceDrive Plate FaceplateTailstock Using QuillInstalling Tooling Positioning TailstockRemoving Tooling Offsetting TailstockTo install tooling in the tailstock To offset the tailstockAligning Tailstock to Spindle Centerline Items Needed QtyTo align the tailstock to the spindle center- line Centers Dead CentersRemoving Center from Spindle Live CentersMounting Dead Center in Spindle Mounting Center in TailstockRemoving Center from Tailstock Mounting Workpiece Between CentersTo install and use the steady rest Steady RestTools Needed Qty Follow Rest Carriage & Slide LocksTool Needed Qty To install a tool in the tool postCompound Rest Four-Way Tool Post To set the compound rest at a certain angleTo align the cutting tool with the tailstock center Aligning Cutting Tool with Spindle CenterlineBelow are two common methods Top ViewCarriage Handwheel Micrometer StopManual Feed Cross Slide HandwheelSetting Spindle Speed Spindle SpeedDetermining Spindle Speed Power Feed Configuration ExamplePower Feed Controls Setting Power Feed Rate Leadscrew UPDial Selection Lever Alternate Configuration Primary ConfigurationSecondary Configuration End GearsEnd-Gear Configuration Example To configure end gears for threading 16 TPIThreading Headstock Threading ControlsTo set levers and dials for 16 TPI Apron Threading Controls Thread DialThread Dial Chart Thread dial chartFor example Pitch TurningHeadstock Pitch Turning Controls To set levers and dials for 1.25 MPLeadscrew UP Coolant System Biological & Poison HazardChip Drawer Chip drawer Model G0746/G0749 Mfg. Since 3/13Accessories G0688-Tool Post GrinderH7991-Mini Mag Base Indicator Set T10118-Tailstock Digital ReadoutH6095-Digital Readout DRO Maintenance Cleaning/ProtectingSchedule Lubrication Lubrication FrequencyHeadstock Quick-Change Gearbox To change the headstock oilApron One-Shot OilerLongitudinal Leadscrew Ball Oilers Ball OilersHandling & Care Coolant System Service HazardsSee Hazards on Adding CoolantChanging Coolant To add coolantMachine Storage Preparing Lathe for StorageBringing Lathe Out of Storage Symptom Possible Cause Possible Solution ServiceTroubleshooting Motor & ElectricalLathe Operation Symptom Possible Cause Possible Solution Backlash Adjustment Compound RestCross Slide To adjust the cross slide gib Leadscrew End-Play AdjustmentGib Adjustment Cross Slide GibCompound Slide Gib Saddle GibTensioning V-Belts To adjust the saddle slide gibBelts To tension the V-BeltsReplacing V-Belts Brake & Switch Adjusting BrakeGap Insert Removal Installation Replacing BrakeGap Removal Gap Installation Wiring Wiring Safety InstructionsElectrical Cabinet & Motors Circuit Diagram Parts Control Rod & BrakeControl Rod Control Rod & Brake Parts List DescriptionBody G0746-49 Bed & Body Parts List Gears Headstock Gears Parts List DescriptionHeadstock ControlsFeed Direction Control Left Spindle Speed Headstock Controls Parts List DescriptionChange Quick-Change Gearbox Parts List PR12M EXT Retaining Ring 35MM 100 Model G0746/G0749 Mfg. Since 3/13 Saddle Saddle Parts List Slides REF DescriptionApron 104 Model G0746/G0749 Mfg. Since 3/13Apron Parts List PCAP26M CAP Screw M6-1 X Model G0746/G0749 Mfg. Since 3/13 107 Tailstock Leadscrew Electrical Cabinet 1601 1603 1611 1604 1605 1608 1602 1606 1607 1609 1610Accessories Front Machine Labels Rear Machine Labels Appendix ThreadingDiametral & Modular Pitch Chart Warranty Card CommentsGrizzly INDUSTRIAL, INC BOX BELLINGHAM, WAWarranty & Returns
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