SteelMax D4X, Operator'S Manual

Page: 21 / 40

D4X
D4X 3/2014
Operator’s manual for drilling machine
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1. Parameters depending on spindle speed(drilling)
Due to the distribution of lubricant after every days work the position of gear lever
(used for selection of gearbox speed) should be changed. For example if machine worked
with 85 rpm speed, it should be switched to 250rpm. If machine worked with 135 rpm speed,
it should be switched to 160 rpm.
Relationship between machine speed and cutter diameter
The cutter diameter
Rotary speed
[rpm]
[inch] [mm]
under 2.95 above 75 85
1.93-2.95 50-75 135
1.14-1,93 30-49 160
0.47-1,14 12-29 250
Relationship between machine speed and twist drill diameter
The twist drill diameter Rotary Speed
[rpm]
[inch] [mm]
1.93-1.85 30-47 85
0.83-1.93 22-29 135
0.63-0.83 16-21 250
2. Guidelines for grading diameters of twist drills when drilling
holes.
Drilling holes of a diameters greater than 18mm to 32mm (11/16 to 1-
1/4”) should be
carried out by preliminary drilling where a diameter of a first hole should be between 70 to
80% of a final hole diameter. Holes greater than 32mm (1-
1/4”) should be drilled initially with
a drill bit of a 18mm
(11/16”) diameter, then with a drill bit of a 80% of the diameter of a final
hole, and finally with use of a drill bit with diameter of a desired size of finished hole. For
example: When drilling a 23mm
(7/8”) diameter hole it is recommended to initially drill it using
a drill bit of 16mm
(5/8”) in diameter and to increase a size of a tool gradually to reach a
diameter of the desired hole; 40mm (1-
9/16”) hole should be drilled consecutively with drill
bits of diameters: 18mm
(11/16”), 32mm (1-1/4”), 40mm (1-9/16”).
Holes
diameter [mm]
Drills diameter [mm]
Number of
passes
Drilling
Expanding the hole
by driling
Expanding the hole
by driling
for 18 for 18 1
18.1 - 32
70% final hole
diameter
final hole diameter 2
32.1 - 40 Ø18
80% final hole
diameter
final hole diameter 3