Machining MIC6
®
General Recommendations
•
Use machines capable of operating at high speeds with minimum vibration or backlash.
•
Use high speeds & feeds for rough cuts, high speeds & lower feeds for better finish cuts.
•
Use the following cutting fluids to prevent aluminium from sticking to tool surfaces
and for heat removal:
> Water-soluble oils for most machining routines
> Cutting oil with additives for horizontal milling, turning and tapping requirements
Commercial wax sticks and paraffin have been used for some sawing and other
special situations.
•
Use sharp tools with larger or positive rake angles. The tool surfaces should be
smooth and free of marks or scratches. Allow ample clearance.
Horizontal Milling
Grooving, straddle-milling, edging and single tooth fly-cutting can be done efficiently
with this method if proper cutting tools are employed. Climb-cutting gives a smoother
finish with better tolerance control provided backlash is minimal. Employ high
peripheral speeds to reduce any tendency toward gumming and loading - sometimes
this means the highest speed possible from a machine.
Vertical Milling
When large surfaces are to be milled, this method is preferred due to greater chip
clearance and accessibility to the work piece. Facing and fly-cutters are used for
surfacing, while end and shell mills are used to contour and create cavities. Fly-cutting
angles for top and side tools are similar to those used in lathe turning. Facing, circular,
spiral and helical cutters should have undercut teeth to provide essential top rake.
Shaping and Planing
This method produces a rough torn surface due to the slow speed on tool travel over
the work piece. A fair finish can be achieved with an extreme rake angle to give
sufficient shearing action to the tool edge.
Circular Sawing
Peripheral blade speeds of approximately 15,000 feet per minute (4575 m/min) are
recommended. Blades should have carbide teeth with up to a 45 degree rake angle.
Such blades are usually manufactured with chip breaker teeth or alternating slide rake
teeth - one tooth cuts one side and the next tooth cuts the other side.
15
Aluminium Plate MIC6
®
- PRECISION MACHINED CAST ALUMINIUM PLATE
