Grizzly G0747 and G0748 owner manual Auto-Downfeed, To use the auto-downfeed

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Auto-Downfeed

When using the auto-downfeed system, the spin- dle will move in the direction you choose with the auto-downfeed direction pin. When the quill dog reaches the top or meets the downfeed stop, the downfeed clutch lever will release. Then, if the spindle was traveling upward, the movement will simply stop. If the spindle was traveling down- ward, then the spindle will move back to the top at a rate controlled by the return spring on the left side of the head.

To use the auto-downfeed:

1.Make sure the spindle is completely stopped.

2.pull the downfeed selector knob out, then rotate it clockwise until the knob pin seats in the auto-downfeed (engaged) detent (see Figure 37).

Note: It may be necessary to turn the spindle by hand as you move the selector to enable the gears to mesh.

Auto-Downfeed (Engaged) Position

Figure 37. Downfeed selector in auto-downfeed

(engaged) position.

3.position the downfeed stop for the spindle depth that is correct for your operation, then secure it in place with the locking wheel.

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4.position the auto-downfeed direction pin in the center of the handwheel for the spindle travel that is correct for your operation. If nec- essary, rock the fine downfeed handwheel back-and-forth to move the pin all the way in or out.

Note: The direction pin has three positions:

1)In for one downfeed direction, 2) middle for neutral or no movement, and 3) out for the reverse direction. The direction of spindle travel for the in and out positions is relative to the direction of spindle rotation. Keep in mind that spindle rotation and downfeed direction will reverse when the spindle speed range is changed.

5.Make sure the clutch lever is all the way to the right in the disengaged position so that the spindle will not travel when rotation is started.

Note: We recommend that you complete the remaining steps without a cutting tool installed, without a workpiece in place, and the table lower than the maximum spindle downfeed travel. This will enable you to test and confirm the settings before beginning the actual cutting operation.

To avoid damage to the system gearing, never use the auto-downfeed system with spindle speeds over 1750 RPM.

6.set the mill for the correct spindle speed, then begin spindle rotation.

Model G0747/G0748 (Mfg. Since 8/12)

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Contents For models manufactured since 8/12 Page Table of Contents Wiring Machine Description Manual Accuracy IntroductionContact Info Front View Identification Model G0747 Headstock Identification Model G0748 Headstock Identification Machine Data Sheet Main Specifications Operation Info Model G0748 Vertical Mill Variable Speed Variable Safety Safety Instructions for MachineryPage Additional Safety for Milling Machines Power Supply AvailabilityFull-Load Current Rating Circuit Requirements forGrounding Instructions Extension CordsMinimum Gauge Size 14 AWG 50 ftNeeded for Setup SetupUnpacking Inventory Small Item Inventory Figure QtyBefore cleaning, gather the following CleanupBasic steps for removing rust preventative Site Considerations HEAVy Lift Lifting & PlacingTo lift and move the mill Leveling & Mounting LevelingBolting to Concrete Floors Machine MountsInitial Lubrication AssemblyTo assemble the mill Test Run Mill Test RunPower Feed Test Run To test the power feedTo perform the spindle break-in procedure Inspections AdjustmentsSpindle Break-In Operations Operation OverviewGraduated Index Rings Table MovementTable Locks Axis Power Feed Identification Axis Power Feed Operation To operate the X-axis power feedHead Movement Tool Needed QtyTilting Head Forward/Backward Rotating Head Left/RightMoving Ram Forward/Backward Ram MovementRotating Ram Spindle Speed Determining Spindle SpeedRecommended Cutting Speed FPM x Tool Diameter in inches xSetting Model G0747 Spindle Speed To set the Model G0747 spindle speedLow Spindle Speed Range Setting Model G0748 Spindle Speed To set the Model G0748 spindle speedSpindle Downfeed Downfeed ControlsFine Downfeed Coarse DownfeedTo use the coarse downfeed Auto-Downfeed To use the auto-downfeedSpindle Brake Model G0747 brake lever G0748 Brake LeverLoading/Unloading Tooling Loading ToolingUnloading Tooling Tools Needed QtyAccessories G1076-52-PC. Clamping KitG7155-6 Precision Milling Vise G9299-10 Yuasa-Type Rotary TableCleaning Protecting MaintenanceSchedule Lubrication QuillTable Ways One-Shot Oiler Headstock GearingHead Tilt & Ram Pinions Ram WaysTable Elevation Leadscrew Power Feed Gears To lubricate the power feed gearsMachine Storage Troubleshooting ServiceSymptom Possible Cause Possible Solution Symptom Possible Cause Possible Solution Adjusting Gibs Saddle gib and adjustment screw Knee Gib Adjustment ScrewAdjusting Leadscrew Backlash Axis Leadscrew BacklashCross Leadscrew Backlash Tramming Spindle To tram the spindle to the tablePage Wiring Wiring Safety InstructionsG0747 Wiring Diagram G0748 Wiring Diagram Parts MainMain Parts List DescriptionAxis Leadscrews DescriptionDownfeed System Downfeed System Parts List CAM ROD Sleeve Assembly G0747 Headstock G0747 Headstock Parts List PFH30M Flat HD SCR M5-.8 XG0748 Headstock G0748 Headstock Parts List Headstock Front COVER, Aluminum One-Shot Oiler Accessories G0747 Machine Labels & Cosmetics G0748 Machine Labels & Cosmetics Model G0747/G0748 Mfg. Since 8/12 Warranty Card CommentsGrizzly INDUSTRIAL, INC BOX BELLINGHAM, WAWarranty & Returns

G0747 and G0748 specifications

The Grizzly G0747 and G0748 are advanced metal lathes designed for precision machining and versatility, catering to both amateur machinists and professional workshops. These machines stand out in the realm of metalworking equipment, thanks to their robust construction and innovative features.

One of the key attributes of the G0747 and G0748 is their solid cast iron construction, which provides excellent vibration dampening during operation. This enhances stability and precision, crucial for producing high-quality machined parts. Equipped with powerful motors, both models are capable of handling a wide range of materials, from aluminum to harder metals like steel.

The G0747 features a variable speed drive system, allowing users to adjust the spindle speed based on the project at hand. This flexibility is beneficial for tasks that require different cutting speeds, enabling machinists to optimize cutting performance and tool longevity. Its variable speed output ranges, alongside smooth torque delivery, make it ideal for intricate turning operations.

On the other hand, the G0748 includes an advanced digital readout (DRO) system. This feature provides real-time feedback on the machine's position and speed, significantly improving accuracy in measurements during machining tasks. The DRO system allows operators to set precise limits and keep track of their progress, essential for complex projects where exact dimensions are critical.

Both lathes are equipped with a user-friendly interface, making them accessible for beginners while still offering advanced functionalities that seasoned professionals appreciate. They include multiple tooling options, allowing for an expansive range of machining techniques including turning, threading, and drilling.

Moreover, the G0747 and G0748 come with a comprehensive assortment of accessories, such as different types of chucks and tool holders, which further extends their capabilities. The ease of changing tooling and quick setup times are significant advantages for shops aiming for efficiency and versatility in their operations.

In conclusion, the Grizzly G0747 and G0748 metal lathes are exemplary units that balance power, precision, and user-friendliness. Their advanced features, such as variable speed capabilities and digital readouts, equip machinists with the tools necessary to produce exceptional work. Whether for hobbyists or industrial applications, these lathes are built to meet a variety of machining needs with impressive performance and reliability.
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