Symptom

Possible Cause

Possible Solution

 

 

Machine has vibration or noisy operation.

1. Motor or component is loose.

1. Inspect, replace for stripped or dam-

 

 

aged bolts/nuts, and re-tighten with

 

 

thread locking fluid.

 

 

 

2. Belts are slapping belt cover.

2. Replace/realign

belts

with

a new

 

 

matched set, and retension belts (refer

 

 

to Page 28).

 

 

 

 

3. V-belt(s) is worn or is loose.

3. Replace belts.

 

 

 

 

4. Motor fan is rubbing on fan cover.

4. Replace/repair dented fan cover, and

 

 

replace loose or damaged fan.

 

 

5. Pulley is loose.

5. Remove pulley,

replace

with

key as

 

 

required, and re-install securely.

 

6. Machine is incorrectly mounted to the

6. Make sure floor mounting hardware is

 

floor, or the floor is uneven.

tight; place shims under machine.

 

7. Chuck or cutter is at fault.

7. Replace out-of-round chuck, replace or

 

 

resharpen cutter, use appropriate feed

 

 

rate and cutting RPM.

 

 

 

8. Motor bearings are at fault.

8. Check bearings, replace motor or bear-

 

 

ings as required.

 

 

 

 

9. Spindle bearings at fault.

9. Replace bearing.

 

 

 

 

 

 

 

 

 

-36-

G7947/G7948 12 Speed Floor Drill Press

Page 37 Page 39
Page 38
Image 38
Grizzly G7948, G7947 instruction manual Pulley is loose Remove pulley
Page 37 Page 39

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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