Grizzly G9249 owner manual Adjusting Half-Nut, To adjust the half-nut guide bar

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Adjusting Half-Nut

The half-nut should engage the leadscrew firmly without tilting from side-to-side during operation. With normal wear over an extended period of use of the half-nut, adjustment of the half-nut guide bar may be necessary.

The goal of adjusting the half-nut guide bar is remove excessive play so that the half-nut eas- ily and firmly engages the leadscrew, but will not tilt from side-to-side when the carriage is moved back and forth.

Tools Needed

Qty

Hex Wrench 3mm

1

Hex Wrench 5mm

1

To adjust the half-nut guide bar:

 

1.DISCONNECT LATHE FROM POWER!

2.Unscrew the cap screw shown in Figure 107 and remove the thread dial assembly.

Half-Nut Lever

Cap Screw

Thread Dial

Assembly

Figure 107. Thread dial and cap screw.

-62-

3.Loosen the two set screws shown in Figure 108 one full turn.

Set

 

Screws

Half-Nut

Figure 108. Half-nut guide bar set screws.

4.Use the half-nut lever to engage the half-nut with the leadscrew, then rotate the carriage handwheel back and forth.

Note: During this step, observe how the half- nut tilts from side-to-side on the leadscrew.

5.Evenly tighten the set screws until a slight resistance is felt.

6.Repeat Steps 4–5until the set screws are just snug—DO NOT overtighten them.

7.Re-install the thread dial.

G9249  12" x 37" Belt Drive Gap Bed Lathe

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Contents Model G9249 Ss ,EAD from Leadbased PAINTS Table of Contents Foreword Functional Overview IntroductionContact Info Identification Machine Data Sheet Tailstock Info Other Specifications  !,7!93 53% !.3 !002/6%$$ 3!&%49 ,!33%33 7%. /0%2!4  !,7!93 53%3 %!2.2 02/4%#4/ %. /0%2!4.! -!#.%29 53%3!!2/5.$%$ %84%.3/..#/2$ 2!4%$4&/2/4%-!#.%!-0%2!%2  53%3 2%#/--%.$%$- !##%33/2%3 -!.9 -!#.%3 #!. %*%#4 7/2+0%#%3 4/7!2$ /0%2!4/2  !,7!93 ,/#+ -/,% !3%3 & 53%$ % %&/2% /0%2!4. -!#.%29#Additional Safety Instructions For Metal Lathes Circuit Requirements 220V OperationSetup Setup SafetyItems Needed for Setup UnpackingInventory Box 1 Inventory Figure QtyClean Up Box 2 Inventory Figure Qty Left Cabinet StandLathe Assembly Placement Placement LocationSite Considerations Floor LoadLoosening the carriage lock bolt Mounting to Shop Floor Using Machine MountsBolting to Concrete Floors Check Gearbox Oil Test RunTo test run the machine Lubrication subsection onMERGENCYG3TOP Utton Factory adjustments that should be verified Recommended AdjustmentsSpindle Break-In Operation Safety OperationsBasic Controls Headstock ControlsCarriage Controls Tailstock ControlsTools Needed Qty Chuck & Faceplate Mounting/RemovalTo remove a chuck or faceplate Mounting a Workpiece Mounting a Chuck or FaceplateTo remove and install the jaws Using the 3-Jaw ChuckTo mount a workpiece in the 3-jaw chuck Using the 4-Jaw Chuck To mount a workpiece on the 4-jaw chuckUsing the Faceplate Installing a Sleeve and Center into the SpindleCenters To mount a workpiece on the faceplateTailstock Installing a Tapered Tool into the QuillRemoving a Sleeve and Center from the Spindle Offsetting Tailstock To set up the tailstock to cut a shallow taperAligning Tailstock To align the tailstock with the headstockStep Drilling with Tailstock To set up the tailstock for drillingTo remove a tapered drill arbor or drill bit To install and use the steady rest Steady RestCross Slide Follow RestHandwheel Dial Increments Compound Slide Tool PostsTo set the compound slide angle To load and use the 4-way tool postSpindle Speed Configuring the V-Belts and Back GearCalculating the Correct Spindle RPM To engage the back gears To disengage the back gearsPower Feed Recommended Feed Rates Setting Feed RateTo set the feed rate To re-configure the change gears Change GearsSide Front View Change gear. G9249 12 x 37 Belt Drive Gap Bed LatheThreading Operation To cut threadsEdhidc Accessories H3022-Measurement Tool SetPc. Carbide Tipped Tool Bit Sets H2670-HSS Square Tool BitsH2996-Double Ended Boring Bar H5936-2 Pc. Knurling Tool SetH6879-Lathe Operation & Maintenance Book G1070-MT3 Live Center SetCleaning Protecting MaintenanceSchedule Lubrication Spindle Bearing OilLubricant Frequency Qty To add oil to the spindle bearing reservoirsHeadstock Change Gears Headstock Idler Pulley ShaftHeadstock Gears Headstock Spindle Pulley ShaftApron Gearbox Feed Rate GearsTo lubricate the feed rate gears Ball Oilers Back Gear ShaftAdjusting Motor V-Belt To adjust the motor V-belt tensionTensioning Replacing V-Belts Replacing Motor V-BeltPower Twist V-Belt G9249 12 x 37 Belt Drive Gap Bed Lathe Spindle V-BeltTroubleshooting ServiceMotor & Electrical Faceplate Operations To adjust the saddle gib Adjusting GibsTo adjust the cross slide and compound slide gibs To adjust the tailstock lock To adjust the cross slide backlashTailstock Lock Cross Slide BacklashGap Removal Spindle Bearing PreloadDisconnect Lathe from Power To confirm that the bearings are correctly pre- loaded To remove/install the rest fingers To remove/install the brass tipsRest Finger Tips Type of Finger Tip Part NumberAdjusting Half-Nut To adjust the half-nut guide barWiring Electrical Safety InstructionsWiring Overview Diagram onControl Panel MotorElectrical Cabinet Wiring Diagram Control Panel & Motor Wiring Diagrams BoxParts BedHeadstock Headstock Parts List Figured Flat NUT M8-1.25Bushing Feed Rate Gearbox Feed Rate Gearbox Parts List Apron Apron Parts List + + Carriage Parts List #* #+ Spindle Lever Change Gear Cover Complete Steady Rest Complete Follow Rest Electrical Cabinet Electrical Cabinet Parts List Cabinet Stand Accessories Label Placement 22!.49 #!2$ 99.$5342!, .# 0//88 %,,.!- 7!  Warranty and Returns #ALL 4ODAYD&ORO! &2%%