COMPACT 110
COMPACT 110
Operator’s manual for drilling machine
- 21 -
1. Parameters depending on spindle speed(drilling)
Due to the distribution of lubricant after every days work 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]
TCT
HSS
[inch]
[mm]
[inch]
[mm]
above 2,95
above 75
above 2,56
above 64
85
1,93÷2,95
50÷75
1,97÷2,56
45÷64
135
1,14÷1,93
30÷49
1,00÷1,97
25÷44
160
0,47÷1,14
12÷29
0,47÷1,00
12-24
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
The rotary speeds given above relate to ordinary quality steel <500N/mm2, such as
e.g. St0 (S185), St3S (S235JR), St4W (S275JO).
In case of steel <700N/mm2 such as e.g. St5 (E295), 18G2A (S355N), 45 (C45),
the rotary speed should be decreased by ca 35%.
2. Guidelines for grading diameters of twist drills when drilling
holes.
