Symptom

Possible Cause

Possible Solution

Tool slips in collet.

1.

Collet not fully drawn into spindle taper.

1.

snug up drawbar to fully seat collet.

 

2.

Wrong size collet.

2.

use correct collet for tool shank diameter.

 

3.

debris on mating surface of collet and

3.

remove oil and debris from mating surface, then

 

 

spindle.

 

re-install.

 

4.

excessive depth of cut.

4.

decrease depth of cut and allow chips to clear.

 

 

 

 

 

Tool breakage.

1.

spindle speed too slow or feed rate too

1.

use correct spindle speed (Page 33 or 35) and feed

 

 

fast.

 

rate.

 

2.

tool getting too hot.

2.

use coolant; reduce spindle speed (Page 33 or 35)

 

 

 

 

or feed rate.

 

3.

excessive depth of cut.

3.

decrease depth of cut and allow chips to clear.

 

 

 

 

 

Workpiece chatters

1.

table locks not tight.

1.

tighten all locks on mill that are not associated with

or vibrated during

 

 

 

necessary table movement for the operation.

operation.

2.

Workpiece not securely clamped to table or

2.

Check that clamping is tight and sufficient for

 

 

 

mill vise.

 

operation; make sure mill vise is clamped tight to

 

 

 

 

table.

 

3.

tool not secure or is damaged.

3.

properly secure the tool; replace if damaged.

 

4.

spindle speed too fast; feed rate too slow.

4.

use correct spindle speed (Page 33 or 35) and feed

 

 

 

 

rate

 

5.

gibs too loose.

5.

properly adjust gibs (Page 51).

 

 

 

 

 

Table hard to move.

1.

table locks are tightened down.

1.

loosen locks needed for movement.

 

2.

Chips have loaded up on ways.

2.

Frequently clean away chips from ways.

 

3.

Ways are dry and in need of lubrication

3.

use one-shot oiler to lubricate ways (Page 45).

 

4.

gibs too tight.

4.

properly adjust gibs (Page 51).

 

 

 

 

 

Bad surface finish.

1.

incorrect spindle speed or feed rate.

1.

use correct spindle speed Page 33 or 35) and feed

 

 

 

 

rate.

 

2.

dull, damaged or incorrect cutting tool.

2.

use sharp and correct cutting tool for operation.

 

3.

Wrong spindle direction for tool.

3.

Check for correct spindle rotation for tool.

 

4.

Workpiece not securely clamped to table or

4.

Make sure workpiece is properly clamped to table or

 

 

mill vise.

 

mill vise; use work holding jig if necessary.

 

5.

gibs too loose.

5.

properly adjust gibs (Page 51).

 

 

 

 

 

Power feed chatters

1.

Brass bevel gear is not meshed with drive

1.

remove parts from power feed side of X-axis

or grinds during

 

gear.

 

leadscrew to ensure bevel gear is properly meshed

operation.

 

 

 

with drive gear; make sure ball handle nut is snug.

 

 

 

 

 

2.

power feed unit at fault.

2.

replace power feed unit.

 

 

 

 

 

-50-

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

Page 51 Page 53
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Image 52
Grizzly G0747 and G0748 owner manual Symptom Possible Cause Possible Solution
Page 51 Page 53

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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