Jet Tools J- A5818 用户手册

 

10

A drill that splits up the web is evidence of too much 
feed or insufficient tip clearance at the center as a 
result of improper grinding. The rapid wearing away 
of the extreme outer corners of the cutting edges 
indicates that the speed is too high. A drill chipping 
or braking out at the cutting edges indicates that 
either the feed is too heavy or the drill has been 
ground with too much tip clearance. 

Alloy Steel — 300 to 400 Brinell ......................20 - 30 
Stainless Steel .................................................30 - 40 
Automotive Steel Forgings ..............................40 - 50 
Tool Steel, 1.2C ...............................................50 - 60 
Steel, .4C to .5C ..............................................70 - 80 
Mild Machinery Steel, .2C to .3C ...................80 - 110 
Hard Chilled Cast Iron .....................................30 - 40 
Medium Hard Cast Iron..................................70 - 100 
Soft Cast Iron..............................................100 – 150 
Malleable Iron .................................................80 – 90 
High Nickel Steel or Monel .............................40 – 50 
High Tensile Bronze .......................................70 -150 
Ordinary Brass and Bronze .........................200 - 300 
Aluminum and its Alloys ..............................200 - 300 
Magnesium and its Alloys............................250 - 400 
Slate, Marble, and Stone ..................................15 -25 
Plastics and similar material (Bakelite)........100 - 150 
Wood ............................................................300 -400 
Titanium Alloys ................................................10 - 25 
Titanium Alloy Sheet........................................50 - 60 
 

5mm hole .....................................................550 - 600 
10mm hole ...................................................250 - 300 
15mm hole ...................................................100 - 110 
 
In cases where carbon steel drills are applicable, the 
drill should be run at speeds of from 40 to 50 
percent of those given above. 

1.  Start drill press. Set speed control to highest 

speed.  Stop drill press. 

2. Disconnect 

electrical power to drill press. 

3.  Remove head cover. 

4.  Remove belt. (With speed control setting at the 

highest speed, the belt should be loose enough 
to remove.) 

5.  Install the replacement belt. Install the head 

cover. 

6.  Connect electrical power to the drill press. 

7. Operate the drill press to verify correct 

operation. 

1. Disconnect 

electrical power to drill press. 

2.  Remove drive belt (see Replacement of Drive Belt). 

3.  Disconnect electrical wiring from motor junction box. 

4.  Remove nuts and washers from bolts securing 

motor to drill head. Remove motor. 

5.  Remove pulleys and related components from 

motor shaft. 

6. Install pulleys and related components on 

replacement motor shaft. 

7.  Install motor on mounting bolts and secure with 

nuts and washers. 

8. Connect electrical wiring (refer to Wiring 

Diagram section for wiring details). 

9.  Install drive belt (see Replacement of Drive Belt). 

10.  Operate drill press to verify proper operation. 

Following are lubrication recommendations for drill 
press components. 

‰

 

Spindle pulley drive: Lubricate spindle splines 
occasionally with light grease. 

‰

 

Quill, Table, and Column: Lubricate with light 
film of oil. 

‰

 

Table lift rack: Lubricate regularly with SAE20 oil 
(clean rack with solvent before applying oil.) 

‰

 

Variable speed drive fork: Lubricate contact 
points occasionally with grease.