how do you calculate the rpm needed to drill a 14mm diam hole in a piece of bronze?

Hi there, my son is doing his homework from a marine engineering course and I am totally out of my depth trying help him!! Does anyone know how to do this?

HELP please


2 Answers

  • SGT. D
    Lv 6
    1 decade ago
    Favorite Answer

    Get yourself a copy of the "Machinerys Handbook" at the library and it will tell you all about calculating Metal cutting speeds and feeds.

  • 1 decade ago

    There are formulae for RPM and FEED RATES

    you need to calculate the feed rate which is high speed slow feed related so you don't break the drill bit.

    Cutting speeds for various materials

    (Based on a plain High Speed Steel cutter)

    Material type meters per min feet per min

    Steel (tough) 15 - 18 50 - 60

    Mild steel 30-38 100-125

    Cast iron (medium) 18-24 60-80

    Bronzes 24-45 80-150

    Brass (soft) 45-60 150-200

    Aluminum 75-105 250-350

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