Grizzly G9249 owner manual Spindle Speed, Calculating the Correct Spindle RPM

Page 36

Spindle Speed

To set the correct spindle speed for your opera- tion, you will need to: 1) Determine the spindle speed needed for your workpiece, and 2) config- ure the belts and gears for the calculated spindle speed.

Calculating the Correct Spindle RPM

1.Use the table in Figure 48 to determine the recommended cutting speed for the workpiece material.

Recommended Cutting Speeds

 

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Note: These values are based on HSS cutting tools. For carbide cutting tools, double the aver- age speed. These values are a guideline only. Refer to the MACHINERY’S HANDBOOK for more detailed information.

Figure 48. Cutting speed table.

2. Determine the final diameter, in inches, for the cut you are about to take.

Note: For this step, you will need to aver- age out the diameters or work with the finish diameter for your calculations.

3. Use the following formula to determine the correct spindle speed (RPM) for your opera- tion:

Spindle Speed = Cutting Speed (SFM) x 4 Diameter of Cut

Configuring the V-Belts and Back Gear

There are twelve spindle speeds are available by properly positioning the motor V-belt, spindle V-belt, and back gears.

To configure the V-belts:

1.DISCONNECT LATHE FROM POWER!

2.Refer to the chart in Figure 49 and find the value closest to your calculated spindle speed.

Note: This chart is also on the front of the headstock. The "Direct" speeds are with the back gear disengaged. Instructions for engaging the back gear are on Page 35.

 

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BACK GEAR

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120

Figure 49. Spindle speed configuration chart.

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G9249  12" x 37" Belt Drive Gap Bed Lathe

Image 36
Contents Model G9249 Ss ,EAD from Leadbased PAINTS Table of Contents Introduction Foreword Functional OverviewContact 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 Using Machine Mounts Mounting to Shop FloorBolting to Concrete Floors Check Gearbox Oil Test RunTo test run the machine Lubrication subsection onMERGENCYG3TOP Utton Recommended Adjustments Factory adjustments that should be verifiedSpindle Break-In Operation Safety OperationsBasic Controls Headstock ControlsCarriage Controls Tailstock ControlsChuck & Faceplate Mounting/Removal Tools Needed QtyTo remove a chuck or faceplate Mounting a Workpiece Mounting a Chuck or FaceplateUsing the 3-Jaw Chuck To remove and install the jawsTo 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 faceplateInstalling a Tapered Tool into the Quill TailstockRemoving 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 To set up the tailstock for drilling Drilling with TailstockTo remove a tapered drill arbor or drill bit To install and use the steady rest Steady RestFollow Rest Cross SlideHandwheel Dial Increments Compound Slide Tool PostsTo set the compound slide angle To load and use the 4-way tool postConfiguring the V-Belts and Back Gear Spindle SpeedCalculating the Correct Spindle RPM To engage the back gears To disengage the back gearsPower Feed Setting Feed Rate Recommended Feed RatesTo 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 SetMaintenance Cleaning ProtectingSchedule Lubrication Spindle Bearing OilLubricant Frequency Qty To add oil to the spindle bearing reservoirsHeadstock Change Gears Headstock Idler Pulley ShaftHeadstock Gears Headstock Spindle Pulley ShaftFeed Rate Gears Apron GearboxTo 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-BeltService TroubleshootingMotor & Electrical Faceplate Operations Adjusting Gibs To adjust the saddle gibTo 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%%