Grizzly g0749, g0746 owner manual Brake & Switch, Adjusting Brake

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Brake & Switch

As the brake lining wears, the foot pedal develops more travel. If the brake band is not adjusted to compensate for normal wear, the limit switch will still turn the lathe OFF, but the spindle will not stop as quickly. It is especially important that the brake is kept properly adjusted so you can quickly stop the spindle in an emergency.

Tools Needed:

Qty

Wrench 17mm

1

Hex Wrench 8mm

1

Adjusting Brake

1.DISCONNECT LATHE FROM POWER!

2.put on a respirator and eye protection to pro- tect yourself from hazardous brake dust.

3.open the end-gear cover.

4.Measure the remaining brake band lining at the thinnest point, which is usually at the 8 o'clock position, as shown in Figure 136.

1mm

Figure 136. Minimum brake belt thickness.

Note: When the brake band is new, the lining is approximately 4mm thick. If the lining thick- ness wears to 1m or less, the brake band must be replaced.

5.Adjust the hex nuts on the pedal bolt shown in Figure 137 to tighten the brake band so there is approximately 18" clearance between the pad and hub around its circumference.

 

Pedal Bolt

 

Pedal

 

Lever

18"

Hex

Nuts

 

Cap Screw

Figure 137. Brake tensioning components.

­—If additional brake band tension is needed, loosen the cap screw shown in Figure 137, pivot the pedal lever to the right and tighten the cap screw.

6.Close the end-gear cover, connect the lathe to power, then test the brake pedal as follows:

a.Start the lathe, then lightly press the foot pedal. The motor should shut OFF.

b.Push the foot pedal down further to stop spindle rotation. You should not need to press the pedal down completely to stop the spindle, nor should the spindle keep rotating. If either symptom occurs, repeat Steps 5–6until you are satisfied with the brake performance.

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

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Contents GEAR-HEAD Lathe Page Table of Contents 117 113Machine Description Manual Accuracy IntroductionContact Info Identification Controls Components Master Power SwitchTailstock CarriageEnd Gears Control Panel Safety Foot BrakeMachine Data Sheet Tailstock Info Construction Model G0749 16 X 40 Heavy Duty Lathe 13-3/4 12.75 qt Safety Instructions for Machinery SafetyPage Additional Safety for Metal Lathes Additional Chuck Safety Full-Load Current Rating AvailabilityCircuit Requirements for To correct the phase polarity of the incoming power supply Correcting Phase PolarityConnection Type Grounding InstructionsNeeded for Setup SetupPreparation UnpackingMain Components Figure Qty InventoryPackaged Components Figure Before cleaning, gather the following CleanupBasic steps for removing rust preventative Site Considerations HEAvy LifT Lifting & PlacingTo lift and move the lathe Anchoring to Concrete Floors Anchoring to Floor LevelingMachine Base Concrete Location of headstock jack screws AssemblyAdding Coolant Lubricating Lathe Power ConnectionTest Run To connect lathe to powerTest run consists of verifying To test run your machineEmergency Lever FeedFactory adjustments that should be verified Recommended AdjustmentsSpindle Break-In Operation Overview OperationsChuck & Plate To install the camlock studsChuck Installation Installation Removal DevicesTo install the chuck Registration mark locations Registration MarksScroll Chuck Clamping Chuck RemovalTo remove the chuck To change the jaw set Changing Jaw SetMounting Workpiece Jaw ChuckFaceplate Drive PlateInstalling Tooling Using QuillTailstock Positioning TailstockTo install tooling in the tailstock Offsetting TailstockRemoving Tooling To offset the tailstockItems Needed Qty Aligning Tailstock to Spindle CenterlineTo align the tailstock to the spindle center- line Dead Centers CentersMounting Dead Center in Spindle Live CentersRemoving Center from Spindle Mounting Center in TailstockMounting Workpiece Between Centers Removing Center from TailstockSteady Rest To install and use the steady restTools Needed Qty Carriage & Slide Locks Follow RestCompound Rest Four-Way Tool Post To install a tool in the tool postTool Needed Qty To set the compound rest at a certain angleBelow are two common methods Aligning Cutting Tool with Spindle CenterlineTo align the cutting tool with the tailstock center Top ViewManual Feed Micrometer StopCarriage Handwheel Cross Slide HandwheelSpindle Speed Setting Spindle SpeedDetermining Spindle Speed Configuration Example Power FeedPower Feed Controls Leadscrew UP Setting Power Feed RateDial Selection Lever Secondary Configuration Primary ConfigurationAlternate Configuration End GearsTo configure end gears for threading 16 TPI End-Gear Configuration ExampleHeadstock Threading Controls ThreadingTo set levers and dials for 16 TPI Thread Dial Apron Threading ControlsThread dial chart Thread Dial ChartHeadstock Pitch Turning Controls Pitch TurningFor example To set levers and dials for 1.25 MPLeadscrew UP Biological & Poison Hazard Coolant SystemChip drawer Model G0746/G0749 Mfg. Since 3/13 Chip DrawerG0688-Tool Post Grinder AccessoriesT10118-Tailstock Digital Readout H7991-Mini Mag Base Indicator SetH6095-Digital Readout DRO Cleaning/Protecting MaintenanceSchedule Lubrication Frequency LubricationHeadstock To change the headstock oil Quick-Change GearboxOne-Shot Oiler ApronLongitudinal Leadscrew Ball Oilers Ball OilersHandling & Care Hazards Coolant System ServiceChanging Coolant Adding CoolantSee Hazards on To add coolantPreparing Lathe for Storage Machine StorageBringing Lathe Out of Storage Troubleshooting ServiceSymptom Possible Cause Possible Solution Motor & ElectricalLathe Operation Symptom Possible Cause Possible Solution Compound Rest Backlash AdjustmentCross Slide Gib Adjustment Leadscrew End-Play AdjustmentTo adjust the cross slide gib Cross Slide GibSaddle Gib Compound Slide GibBelts To adjust the saddle slide gibTensioning V-Belts To tension the V-BeltsReplacing V-Belts Adjusting Brake Brake & SwitchReplacing Brake Gap Insert Removal InstallationGap Removal Gap Installation Wiring Safety Instructions WiringElectrical Cabinet & Motors Circuit Diagram Control Rod & Brake PartsControl Rod Description Control Rod & Brake Parts ListBody G0746-49 Bed & Body Parts List Gears Description Headstock Gears Parts ListControls HeadstockFeed Direction Control Left Spindle Speed Description Headstock Controls Parts ListChange Quick-Change Gearbox Parts List PR12M EXT Retaining Ring 35MM 100 Model G0746/G0749 Mfg. Since 3/13 Saddle Saddle Parts List REF Description Slides104 Model G0746/G0749 Mfg. Since 3/13 ApronApron Parts List PCAP26M CAP Screw M6-1 X Model G0746/G0749 Mfg. Since 3/13 107 Tailstock Leadscrew 1601 1603 1611 1604 1605 1608 1602 1606 1607 1609 1610 Electrical CabinetAccessories Front Machine Labels Rear Machine Labels Threading AppendixDiametral & Modular Pitch Chart Comments Warranty CardBOX BELLINGHAM, WA Grizzly INDUSTRIAL, INCWarranty & Returns