Separator ™
Machining Guidelines
• If 0° lead angle is mandatory,
use the narrowest possible
cut-off insert and blade. This
will minimise the centre stub or
cut-off bur length. Decrease the
feed rate to maximum 0,05mm
or less at the point where
diameter equals insert width.
Defi nitions and Guidelines
1. Width of cut (W) = width of the insert.
2. Lead angle = 0° (neutral); 4°, 5°, 12°, 18° (RH or LH).
Reduce bur of cut-off faces:
• On tubing-type parts that
require a chamfer on the I.D.,
align I.D. chamfer tool with cut-
off surface. This will enable the
chamfering operation to actually
separate the part from the bar
(see Figure 4). Note the part
may drop onto the chamfering
bar, which, in this case, will act
like a catcher for the part.
• Use lead angle-type inserts (Figures 1 and 2). Lead
angle on a cut-off insert reduces the bur that remains
on the part but decreases tool life and increases tool
side defl ection and possibly cycle time.
Figure 1
Figure 4
Internal chamfer line up
Insert selection left-hand lead
bur
centre stub
part
Improve surface fi nish of cut-off faces:
(stock)
(stock)
• Use insert with 0° lead angle.
cut-off to centre
• Increase coolant fl ow or improve application technique,
as shown in Figure 5.
tube cut-off
• Decrease the feed rate near the break-through point of the cut.
• Check that the grooving tool is set at the correct angle.
Left-hand lead insert leaves centre stub or bur on part
and produces clean stock surface.
• Use blades with the greatest possible face height and smallest
possible cutting width.
• Increase the speed.
Figure 2
Insert selection right-hand lead
centre stub
bur
(stock) (stock)
cut-off to centre tube cut-off
part
Right-hand lead insert leaves centre stub or bur on stock and
produces clean part surface.
• Check total height and maintain on centre with part diameter.
Figure 3 Figure 5
Above centre Preferred method for applying coolant
max 0,10mm
(.004")
E130
• Mount cut-off tool upside down. This enables gravity to remove
chips and avoid cutting the chips twice. Another benefi t of
mounting the tool upside down is preventing chips from wedging
between the tool insert and the groove side walls, which galls the
side wall surfaces.
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• The cutting edge height should be within ±.0,1mm to the
centre; recommended cutting position is 0,05mm above centre.