Concept explainers
Suppose that you wanted to machine cast iron with BHN of 275. The process to be used is face milling and an HSS cutter is going to be used. What feed and speed values would you select?
Feed and speed value for the face milling.
Explanation of Solution
Given:
Part is cast iron.
Hardness number is 275.
Face milling with HSS cutter is used.
Cutting speed and feed per tooth for the milling operation is selected by the tool operator or engineer. These cutting velocity and feed depends on tool material, specific process and work material.
Following tables shows the cutting speed and fee for different material, cutter and milling process:
From above table,
Feed can be selected for cast iron is 0.005 − 0.012.
Cutting velocity can be selected for the cast iron as 20-35 fpm.
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