EINHELL MBF 550 Bedienungsanleitung Seite 18

Anleitung MBF 550 25.02.2005
GB
7.2 Correct rotational speed / cutting speed
The choice of the correct cutting speed has an enor-
mous effect on the service life of the tool and on the
work results. The right speed depends on the materi-
al. If the chosen rotational speed is correct, the cut-
ting speed will also be correct.
7.2.1 Drilling
Rule of thumb: The smaller the hole and the softer
the material, the higher the speed of rotation.
The table below will help you select the proper speed
for the various materials.
Note: The rotational speeds shown are merely sug-
gested values.
To adjust the speed, see chapter 7.1.
Drill bit Ø Cast iron Steel Iron Aluminium
3 2550 1600 2230 9500
4 1900 1200 1680 7200
5 1530 955 1340 5700
6 1270 800 1100 4800
7 1090 680 960 4100
8 960 600 840 3600
9 850 530 740 3200
10 765 480 670 2860
11 700 435 610 2600
12 640 400 560 2400
13 590 370 515 2200
14 545 340 480 2000
16 480 300 420 1800
18 425 265 370 1600
20 380 240 335 1400
22 350 220 305 1300
25 305 190 270 1150
7.2.2 Routing
The rotational speed can be calculated as follows:
n = v / ( x d )
n = rotational speed in min -1
v = cutting speed in m/min
d = tool diameter in m
 = 3.14
The values for the cutting speeds and maximum cut-
ting depths for the relevant material are given in the
list below or in a book of tables.
18
9:47 Uhr Seite 18
High-speed steel
cutting
Tensile
Material depth Cutting speed
strength
a [mm] v [m/min]
0,5 70 - 50
500 - 700 3 50 - 30
Gen.
10 30 - 20
Structural
0,5 45 - 30
steel; tool
700 - 900 3 30 - 20
steel; case-
10 18 - 12
hardened
0,5 30 - 20
and
900 - 1100 3 20 - 15
tempered
10 18 - 10
steel; cast
- -
steel
1100 - 1400 - -
- -
Free-cutting 0,5 90 - 40
700
steel 3 75 - 30
0,5 45 - 35
200 3 35 - 25
Gray cast
10 20 - 15
iron
0,5 40 - 30
200 - 400
3 30 - 20
0,5 70 - 45
Blackheart
350 3 60 - 40
iron
6 40 - 20
Bronze
White
0,5 60 - 40
malleable 350 - 400 3 50 - 35
8000
iron 6 35 - 20
0,5 180 - 160
6000
60 - 320 3 160 - 140
6 140 - 120
4800
Aluminium
1 140 - 100
320 - 440
alloys
4000 6 120 - 80
- -
440 +
3400
- -
3 150 - 100
200 - 400
3000
Copper 6 120 - 70
alloys 3 100 - 55
400 - 800
2650
6 55 - 35
2400
7.3 Clamping the tools (Figs. 4,5,6)
2170 Only tools, clamping fixtures or tool chucks with
Morse taper MK3 and internal thread M12 may be
2000
used to ensure positive fixing in the work spindle.
1840
Reducing bushes must not be used!
1700
1500
7.3.1 Clamping tools in the work spindle
1300
Switch the machine off and unplug the power
plug.
1200
Remove the spindle guard (15).
1100
Clean and degrease the tapered shank and
950
spindle.
Now insert the tapered shank (18) into the bush of
the work spindle (4). Important: To avoid injury,
always use a cloth to hold the routing cutter!
To fix the work spindle in position, insert the
locating pin (17) into the side of the spindle bush.
To fix the tapered shank in position, tighten the tie
rod (19) using an open-end wrench (SW10). The
tie rod must be screwed into the taper mandrel
with about 8 turns (clockwise) of the wrench.
Important: Always secure the tool or the drill
chuck with the tie rod in order to prevent the tool
from working loose.
Remove the locating pin (17).
Reattach the spindle guard (15).
Hard metal
Cutting
depth Cutting speed
a [mm] v [m/min]
1 200 - 150
6 100 - 70
10 70 - 50
1 150 - 110
6 80 - 55
10 55 - 35
1 110 - 75
6 55 - 35
10 35 - 25
1 75 - 50
3 50 - 30
6 30 - 20
1 160 - 80
3 120 - 60
1 100 - 80
3 90 - 60
10 60 - 40
1 100 - 70
3 70 - 50
1 240 - 190
3 190 - 140
6 140 - 80
1 150 - 100
3 100 - 60
6 70 - 45
0,5 700 +
3 600 - 400
6 500 - 250
1 400 - 200
6 300 - 150
1 200 - 120
6 150 - 50
3 450 - 350
6 350 - 250
3 400 - 300
6 30 - 200