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  1. #1
    Member
    Join Date
    Apr 2020
    Posts
    16

    Post How-To: Feed Rate Calculation

    In general when it comes to building a tool path; you will need to determine the correct feed rate. Different materials have different surface speed ratings for any given type of cutter.

    As you can imagine the harder a material is, the slower we would set our speeds to. So, if we take the diameter of the cutter we would like to use and then also the surface speed of the material we would like to use, we can then calculate the correct RPM’s for our spindle.

    Next we need to know the tooth load and also the number of teeth for the cutter, now we can determine the correct feed rate.

    We can do this with the following calculations:

    Spindle Speed = 3.82 * Material Surface Speed / Cutter Diameter
    Feed Rate = Tooth Load * Number of Teeth * Spindle Speed

    So using the above we could take a 6mm Cutter, a Surface Speed of 280 and this would give us a Spindle Speed of 178.3rpm. Now we can take our Tooth Load, times it by the Number of Teeth our Cutter has, and then times that by our Spindle Speed. This gives us a feed rate of 0.7, all units being in English of course!

    Hope you found this useful...!

  2. #2

    Re: How-To: Feed Rate Calculation

    No matter what the machine tool chooses, the first is to determine the form of the tool and the material of the tool according to the processing technology of your workpiece and the performance of the machine tool steel
    The specific cutting parameters are determined according to your workpiece material, heat treatment hardness, processing requirements and machine power
    After the tool form and size are determined, first determine the linear speed of the tool according to the workpiece material, hardness and tool material, then determine the cutting depth according to the machining allowance of the workpiece and the power and rigidity of the machine tool, and finally according to the surface roughness requirements of the workpiece and The requirement of cnc machining efficiency determines the feed rate
    The calculation formula is
    Linear speed = tool diameter * 3.14 * speed / 1000
    Feed rate = speed * feed per blade (feed per revolution) * number of blades
    if you want to learn more, please refer to PTJ Machining

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