SPEEDS

Speeds and feeds are the most important factors to consider for best results in milling. Improper feeds and speeds often cause low production, poor work quality and unnecessary damage to the cutter. In milling, SPEED is measured in periphery feet per minute, (revolutions per minute times cutter circumference in feet). This is referred to as "periphery speed", 'cutting speed" or "surface speed".

The figures given in the following table are starting speeds only. They will have to be tempered to suit the condition ON THE JOB.

Use lower speed ranges for:

Hard Materials
Tough materials
Abrasive Materials
Heavy cuts
Minimum tool wear
Maximum cutter life

Use higher speed ranges for:

Softer Materials
Better Finishes
Smaller diameter cuts
Light Cuts
Frail work pieces or set-ups
Hand feed operations
Maximum production rates
Non-metallics