Use Of Collet Chucks; Clamping The Workpieces; Changing The Speed Range - Optimum BF20 L Vario Operating Manual

Operation
ATTENTION!
When installing a cold morse taper into a heated-up machine those MT seats tend to
shrink on the morse taper contrary to the quick-releaser tapers.
4.5.3

Use of collet chucks

When using collet chucks to hold milling tools, a higher operation tolerance can be achieved.
The exchange of the collet chucks for a smaller or larger end mill cutter is done in a simple and
rapid way and it is not necessary to disassemble the complete tool. The collet chuck is pressed
into the ring of the swivel nut and has to rest there by itself. The milling cutter is clamped by fas-
tening the swivel nut on the tool.
Make sure that the correct collet chuck is used for each milling cutter diameter, so that the
milling cutter may be fastened securely and firmly.
"Optional accessory" on page 24
4.6

Clamping the workpieces

CAUTION!
Injury by parts flying off.
The workpiece always needs to be fixed by a machine vice, a jaw chuck or by another
appropriate clamping tools such as clamping claws.
4.7

Changing the speed range

ATTENTION!
Wait until the drilling-milling machine has come to a complete halt before changing the
speed using the gear switch.
Select reduction stage.
H = rapid
L = low
Adjust the speed with the potentiome-
ter. The speed and thus the cutting
speed are depending on the material of
the workpiece, the milling cutter diame-
ter and the cutter type.
9 / 03 / 2010 Version 3.1.4 BF 20 Vario ; BF 20 L Vario
OPTIMUM
M A S C H I N E N - G E R M A N Y
Selector switch
reduction stage
Fig.4-6: Drill-mill head
Drilling-Milling machine Page 29