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Grizzly G7948 - User Manual

Grizzly G7948
60 pages
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COPYRIGHT © AUGUST, 2005 BY GRIZZLY INDUSTRIAL, INC. REVISED JANUARY, 2021 (JL)
WARNING: NO PORTION OF THIS MANUAL MAY BE REPRODUCED IN ANY SHAPE
OR FORM WITHOUT THE WRITTEN APPROVAL OF GRIZZLY INDUSTRIAL, INC.
#TR7410 PRINTED IN CHINA
G7947 G7948
V3.01.21
MODEL G7947 G7948
12-SPEED DRILL PRESSES
OWNER'S MANUAL
(For models manufactured since 01/21)
184841

Table of Contents

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Questions and Answers

  • B
    Brandon MillerAug 18, 2025
    What to do if Grizzly G7948 Drill has tool loose or lack of power in spindle?
    • D
      daughertymelissaAug 18, 2025
      If you're experiencing a tool loose or lack of power in the spindle of your Grizzly Drill, here are some potential causes and solutions: * The tool might be incorrectly installed in the spindle taper. Remove and reinstall the tool. * There might be debris on the tool or spindle taper mating surfaces. Clean the tool and spindle taper. * You might be taking too big of a cut. Lessen the depth of cut and allow chips to clear. * The V-belts might be loose. Properly tension the V-belts. * The voltage might be wrong. Correct the voltage.
  • J
    james60Aug 27, 2025
    What to do if workpiece or tool vibrates or chatters during Grizzly G7948 Drill operation?
    • D
      Dawn CruzAug 27, 2025
      If the workpiece or tool vibrates or chatters during Grizzly Drill operation, here are a few things to check: * Table locks might not be tight. Tighten the table locks. * The workpiece might not be secure. Properly clamp the workpiece on the table or in a vise. * The spindle speed or feed rate might be too fast. Set the spindle speed correctly or use a slower feed rate. * The spindle or quill might be extended too far down. Fully retract the spindle and lower the headstock to increase rigidity and decrease vibration.
  • J
    Jessica WarnerAug 30, 2025
    Why Grizzly Drill produces bad surface finish?
    • P
      palmerjohnAug 31, 2025
      If you're experiencing a bad surface finish with your Grizzly Drill, consider these potential causes: * The spindle speed might be too fast for the workpiece material. Set the spindle speed correctly. * The cutting tool might be dull or incorrect. Sharpen the cutting tool or select one that better suits the operation. * The rotation direction of the cutting tool might be wrong. Check for proper cutting tool rotation. * The workpiece might not be secure. Properly clamp the workpiece on the table or in a vise. * The spindle might be extended too far down during operation. Fully retract the spindle and lower the headstock to increase rigidity.
  • M
    Matthew CraigSep 2, 2025
    Why Grizzly G7948 Drill headstock is hard to raise?
    • G
      Gary LeonardSep 3, 2025
      If the headstock of your Grizzly Drill is hard to raise, it could be due to: * Faulty headstock lock nuts. Loosen or replace the lock nuts. * A faulty rack and pinion, or one jammed with grime or debris. Fix or replace any broken or loose parts, and clean and lubricate the rack and pinion.
  • D
    David AlvarezSep 5, 2025
    Why Grizzly Drill spindle overheats?
    • I
      Isaac LevySep 6, 2025
      If the spindle of your Grizzly Drill overheats, it is because the drill operated at high speeds for an extended period. Allow the drill to cool.
  • D
    Daniel HarrisSep 8, 2025
    Why Grizzly G7948 Drill spindle does not return to highest position?
    • K
      Kelsey GoodSep 8, 2025
      If the spindle of your Grizzly Drill does not return to the highest position, it may be due to: * A poorly adjusted return spring. Increase the return spring tension. * A worn return spring. Replace the return spring.
  • S
    Stacey RussellSep 12, 2025
    Why Grizzly Drill depth stop pro ducing inaccurate results?
    • M
      Mario CareySep 12, 2025
      If the depth stop on your Grizzly Drill is producing inaccurate results, it is because the depth stop is not calibrated. Calibrate the depth stop.
  • A
    Alicia DavisNov 14, 2025
    Why is my Grizzly G7948 stalling or underpowered?
    • C
      Christopher HermanNov 14, 2025
      If your Grizzly Drill machine stalls or is underpowered, consider the following potential causes: * The cutter or bit might be incorrect or dull for the task. Use the correct cutter or bit. * The feed rate or cutting speed might be too fast. Decrease the feed rate or cutting speed. * The belts might be slipping. Ensure belts are oil-free, properly tensioned, and replace if necessary. Also, make sure the pulleys are aligned. * The machine might be undersized for the task. Try performing the operation with a different machine. * The motor might be overheated. Clean the motor, let it cool down, and reduce the workload. Other possible issues include a pulley slipping on the shaft, a faulty centrifugal switch, or a motor fault. Address these components as needed by tightening loose ...
  • B
    Bailey WhitneyNov 20, 2025
    Why does my Grizzly G7948 machine not start?
    • C
      Christopher EstesNov 21, 2025
      If your Grizzly Drill machine does not start or a breaker trips, here's what might be happening: * The disabling key might be removed or faulty. Ensure it's inserted correctly or replace it if needed. * The power supply voltage or circuit size may be incorrect. Verify you have the correct voltage and circuit size. * The power supply circuit breaker might have tripped, or a fuse blown. Make sure the circuit is properly sized and free of shorts. Reset the circuit breaker or replace the fuse. * Motor wires could be connected incorrectly. Correct the motor wiring connections. * There might be broken, disconnected, or corroded wires. Check and fix any wiring issues. Additional possible causes include a faulty start capacitor, a faulty centrifugal switch, or a motor fault. Test and r...
  • A
    Ashley GuerreroNov 23, 2025
    How to fix vibration or noisy operation of Grizzly G7948 Drill?
    • S
      Sarah LarsonNov 23, 2025
      If your Grizzly Drill has vibration or noisy operation, several factors could be responsible: * A motor or other drive component might be loose. Inspect and replace any damaged bolts or nuts, and retighten them, using thread-locking fluid if necessary. * V-belts could be worn or loose. Inspect and replace belts with a new matched set. * The motor fan might be rubbing on the fan cover. Fix or replace the fan cover, and replace any loose or damaged fan. * A pulley might be loose. Re-align or replace the shaft, pulley set screw, and key. * The motor mount could be loose or broken. Tighten or replace it. Other potential causes include faulty motor or spindle bearings, or an unbalanced chuck or dull cutter. Test the bearings by rotating the shaft; rotational grinding or a loose shaf...

Summary

Controls and Components Overview

G7947 Machine Data Sheet

G7948 Machine Data Sheet

Safety

Safety Instructions for Machinery

Critical safety instructions for operating machinery, including hazard symbols.

General Safety Precautions

Covers apparel, dust, hearing, tools, and work environment safety.

Additional Safety for Drill Presses

Specific safety recommendations tailored for drill press operation.

Power Supply Requirements

Availability and Circuit Requirements

Power supply availability and circuit requirements for 120V and 240V operation.

Grounding Requirements

Essential grounding procedures and precautions for safe electrical connection.

Voltage Conversion Procedure

Setup Procedures

Inventory and Parts Check

Site Considerations

Physical and Environmental Requirements

Installation and Mounting

Anchoring to Floor

Mounting to Mobile Base

Assembly Instructions

Headstock and Column Assembly

Positioning and Securing Headstock

Installing Guards and Table

Test Run Procedure

Operations

Operation Overview

Calculating Spindle Speed

Explains how to use the speed chart for optimal drilling RPMs.

Changing Spindle Speeds

Step-by-step guide on adjusting spindle speeds using the V-belt system.

Drilling Procedures

Details safe and effective drilling techniques and considerations.

Installing and Removing Drill Bits

Setting the Depth Stop

Maintenance

General Maintenance Schedule

Outlines ongoing and monthly checks for safe operation and performance.

Service and Troubleshooting

Motor and Electrical Troubleshooting

Addresses common issues related to the motor and electrical system.

Drill Press Operations Troubleshooting

Solves problems related to tool fit, workpiece vibration, finish, and spindle operation.

Adjustments and Calibration

Calibrating Depth Stop

How to recalibrate the depth stop scale for accuracy.

Tensioning Spindle Return Spring

Adjusting spindle return spring tension for proper quill retraction.

Wiring Information

Wiring Safety Instructions

Crucial safety guidelines for working with electrical wiring.

Wiring Diagram

Provides the electrical wiring diagram for both 120V and 240V configurations.

Parts Breakdown

Grizzly G7948 Specifications

General IconGeneral
BrandGrizzly
ModelG7948
CategoryDrill
LanguageEnglish

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