Meec tools 016640, Руководство пользователя, Страница: 60 / 236

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SPINDLE SPEED
Choose the speed on the basis of the material, hole diameter, type of drill and the required quality
of the drilling. The smaller the diameter of the hole, the higher the speed. Soft materials need a
higher speed than hard ones. Make sure to have the right speed for the hole diameter and the actual
material.
FIG. 24
See guide values for the speed in the table on the next page.
Guide values for speed
The speeds in the table below can be used as guide values when selecting the speed for different
diameters/combinations of material.
Hole
( Ø mm)
Cast iron Steel Iron Aluminium Bronze
3 2550 1600 2230 9500 8000
4 1900 1,200 1680 7200 6000
5 1530 955 1340 5700 4800
6 1270 800 1100 4800 4000
7 1090 680 960 4100 3400
8 960 600 840 3600 3000
9 850 530 740 3200 2650
10 765 480 670 2860 2400
11 700 435 610 2600 2170
12 640 400 560 2400 2000
13 590 370 515 2200 1840
14 545 340 480 2000 1700
16 480 300 420 1800 1500
DRILLING HOLES
• Mark the position of the centre of the hole on the workpiece with a punch. Lower the spindle
without starting it so that the tip of the drill just touches the workpiece and then centre the drill
and punch mark to each other. Start the spindle and lower it down so that the drill is pressed
against the workpiece, gently with just enough force for the drill to make a clean cut.
• Feeding too slowly can risk overheating the drill.
• Feeding too quickly risks overloading and stopping the motor, and can cause the drive belts to
slip, the workpiece to come loose, or the drill to break.
• The tip of the drill may need cooling with a suitable coolant when drilling in metal.