Central Lubrication System; Data Interfaces And Current Collection; Selecting The Speed - Grizzly G0876 Owner's Manual

For the following working steps, please proceed as described in „Operation and
programming" of the Siemens "SINUMERIK 808D" Operation instructions.
6.9

Central lubrication system

The CNC machine is equipped with a central lubrication system.
The lubricating system is used to maintain an oil film on the slideways, the bearings, the ledges
and the ball screws and to reduce their wear.
In case of a failure or a fault in the central lubricating system, a stick-slip effect may occur. This
effect describes the jerky sliding of solid bodies moving opposite one another. For instance:
creaking doors and rattling windscreen wipers.
6.10

Data interfaces and current collection

When connecting data interfaces make sure that the data cable runs to the control unit interface
via the shortest possible distance. The cable routing can be conducted along the measuring
system lines. However the cable in the switch cabinet must never be routed near the drive units
of the NC axis or the frequency converter itself. Electromagnetic radiation causes errors during
data transfer (EMC problems).
The control is equipped with the following data interfaces.
X130 Ethernet port (RJ45 connector, only 808D ADVANCED)

USB connection

Connection for power supply

6.11

Selecting the speed

The correct speed is an important factor for milling. The speed determines the cutting speed by
which the cutting edges cut the material. By selecting the correct cutting speed, the service life
of the tool is increased and the working result is optimized.
The optimum cutting speed mainly depends on the material and on the material of the tool. With
tools (milling cutters) made of hard metal or ceramic insert it is possible to work with higher
speeds than with tools made of high-alloy high speed steel (HSS). You will achieve the optimal
cutting speed by selecting the correct rotation speed.
In order to determine the correct cutting speed for your tool and for the material to be cut you
may refer to the following standard values or a table reference book.
The required speed is calculated as follows:
V
----------- -
n =
 d 
-1
n = speed in min (revolutions per minute)
V = cutting speed in m/min (meter per minute)
d = tool diameter in m (Meter)
6.11.1 Standard values for cutting speeds
[ m/min ] with high-speed steel and hard metal in upcut milling.
Tool
Plain mill and side milling cutters [ m/min ]
Relieved form cutters [ m/min ]
-62-
Steel Grey cast iron
10 - 25 10 - 22
15 - 24 10 - 20
Al
alloy
age-hardened
150 - 350
150 - 250
Model G0876 (Mfd. Since 3/19)