Drill Press Operations

Symptom

Possible Cause

Possible Solution

Drilling stops, but the motor still oper-

1. The belt is loose or worn.

1. Replace and/or adjust the belt.

ates.

2. The pulley for the spindle shaft or the

2. To resecure the pulley, do these

 

motor is slipping on the shaft.

steps:

 

 

a. UNPLUG THE DRILL PRESS.

 

 

b. Remove the setscrew on the slipping

 

 

pulley.

 

 

c. Align the flats on the pulley shaft with

 

 

the setscrew hole.

 

 

d. Reinstall and tighten the setscrew.

 

3. Bit slips in chuck.

3. Tighten bit; inspect bit for burrs or other

 

 

obstructions that might interfere with

 

 

clamping surface.

 

 

 

The chuck wobbles or is loose on the

1. Foreign material is stuck between the

1. Remove the chuck and clean and de-

spindle shaft.

chuck-to-spindle mating surface.

burr the tapered chuck and spindle

 

 

mating surfaces, then reassemble.

 

2. Damaged chuck.

2. Replace.

 

 

 

The spindle does not retract completely

1. The quill shaft is gummy with sawdust

1. Clean the gummy substance with pen-

in the uppermost position or it binds.

and oil.

etrating oil and lubricate with a light

 

 

coat of oil.

 

2. The feed shaft return spring is weak.

2. Increase the feed shaft return spring

 

 

tension as described on Page 38.

 

3. The quill deflection screw is binding the

3. Loosen the jam nut, and slightly turn

 

quill.

out the screw where the quill binds.

 

 

Retighten the jam nut and recheck for

 

 

binding and looseness at all spindle

 

 

locations.

 

 

 

The quill has excessive deflection.

1. The quill shaft is at fault.

1. Adjust the quill screw.

 

 

2. Replace the quill and/or bearings.

 

2. The quill and/or bearings are worn.

 

 

 

 

Holes drilled at an angle.

1. Table is not at 90 degrees.

1. Adjust table angle (see Page 30).

 

 

 

Drill bit wobbles, holes are oversized.

1. Drill bit installed incorrectly.

2. Remove drill bit and reinstall.

 

 

 

G7947/G7948 12 Speed Floor Drill Press

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Page 38 Page 40
Page 39
Image 39
Grizzly G7947, G7948 instruction manual Drill Press Operations
Page 38 Page 40

G7947, G7948 specifications

The Grizzly G7948 and G7947 are powerful, professional-grade milling machines designed for precision metalworking. These models cater to the needs of machinists and hobbyists alike, combining innovation with robust features ideal for various milling tasks.

The Grizzly G7948 is a vertical mill with a large working table, allowing users to handle bigger workpieces efficiently. It features a 2 HP motor, providing a spindle speed range from 50 to 3,000 RPM, enabling operators to tackle a wide range of materials and applications. The G7948’s dovetail column ensures stability and rigidity, minimizing vibrations during operation, which is crucial for achieving precision in milling tasks.

On the other hand, the Grizzly G7947 is a versatile combination of a lathe and a mill, perfect for those looking to maximize functionality in a smaller workspace. It also boasts a robust 1 HP motor, allowing for smooth operation with adjustable spindle speeds, enhancing its versatility. The G7947 is particularly user-friendly, featuring a quick-change tool post that facilitates faster tool swapping and changeovers, which is a significant advantage when working on multiple projects.

Both models come equipped with advanced features such as a digital readout (DRO) system that aids in precision measurements. The DRO provides real-time feedback on the machine's positioning, helping eliminate guesswork and ensuring accuracy. Additionally, the machines' power feed for the table enhances efficiency, making it easier for users to execute repetitive tasks without the strain of manual cranking.

Another notable characteristic of the Grizzly G7948 and G7947 is their user-friendly controls, designed with ergonomics in mind. The intuitive layout ensures that operators can easily navigate through the machine’s settings, allowing for quicker setup times and smoother workflow.

Lastly, the sturdy construction of both milling machines means they are built to withstand rigorous use, making them reliable choices for both industrial applications and serious hobbyists. These models exemplify Grizzly's commitment to quality and performance, making them exceptional additions to any workshop.
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