44
XYZ Machine Tools Ltd
TRAK
2
OP
Installation, Maintenance, Service & Part List Manual
5.1.3
Lubrication
Lubrication is one of the most important maintenance issues and plays a key role in assuring the
performance and durability of the machine. The ProtoTRAK will automatically lubricate the machine when it
is first turned on. If the machine has been left on overnight, it is recommended to go to service code 300
to lubricate the guides and ballscrews at the beginning of the shift.
Lack of lubrication using recommended type of lubricant can lead to a variety of problems with your
machine motion due to increased friction in the sliding ways. This increased friction may lead to part
inaccuracies and decreased life expectancies of your ball screws and linear guides.
5.1.4
Machining Set-Up
The machining set-up can greatly influence the performance of your mill. Be aware of the following:
Problems With
Can Contribute To:
Feed and Speeds (spindle rpm)
See below
Poor finish
Machine chatter
Excessive speeds and feeds can break cutting tools or wear
tools prematurely.
Poor Tooling
Using the wrong cutter for an
application
Entering the wrong size diameter.
Poor finish
Tool chatter
Parts incorrect size
Cutting too deep
Part dimensions incorrect
Driving and cutting forces cause deflections, since no material
is totally rigid
Machine chatter
No coolant
Poor finish, decrease the life of the cutter
5.1.4.1
Spindle Speeds
Spindle speeds are influenced by a number of variables:
•
Material
•
Rigidity of the Machine Setup
•
Coolant
•
Cutter type, material and diameter
•
Cutting Depth
As a general rule:
•
Lower spindle speeds are used to machine hard or tough material or where heavy cuts are
taken.
•
Higher spindle speeds are used to machine softer materials in order to achieve better surface
finishes. Higher speeds also apply when using small diameter cutters for light cuts on delicate
setups.
Note: Cutter diameter greatly affects spindle speeds. The larger the diameter, the lower the spindle speed.
5.1.4.2
Feedrates
Factors that affect feedrates:
•
Depth and width of cut
•
Design or type of cutter
•
Sharpness of the cutter
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