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1. Relationship between machine speed and cutter diameter – parameters
After work position of gear lever (used for selection of gearbox speed) should be
changed. For example if machine worked with 200 rpm speed, it should be switched to
400rpm.
Relationship between machine speed and cutter diameter
Relationship between machine speed and twist drill diameter
The above rate on ordinary quality steel <500N/mm2, such as S185, S235JR,
S275JO and use a sharp tool.
For steel <700N/mm2 like E295, S355N,C45, speed should be reduced by about
35%.
2. Guidelines for grading diameters of twist drills when drilling
holes.
Drilling holes of a diameters greater than 18mm should be carried out by preliminary
drilling where a diameter of a first hole should be 0,7 of a final hole diameter.
For example: When drilling a 23mm diameter hole it is recommended to initially drill it using a
drill bit of 16mm in diameter and to increase a size of a tool gradually to reach a diameter of
the desired hole.
Holes diameter
[mm]
for 18
18,1 - 23
The cutter diameter
[inch]
[mm]
1,00÷1,50
12÷35
1,51÷2,00
36÷50
The twist drill diameter
[inch]
[mm]
0,04÷0,43
3,5÷13
0,44÷0,67
14÷22
Drills diameter [mm]
Drilling
for 18
0,7 final hole
diameter
Operator's manual for Drilling Machine MAGBEAST 2
Rotary speed
[rpm]
400
200
Rotary speed
[rpm]
400
200
Number
of passes
Expanding the
hole by driling
final hole diameter
MAGBEAST 2
1
2
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