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What is the maximum feed rate for New Shark ll

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  • What is the maximum feed rate for New Shark ll

    Looking through my documentation I can't seem to find factory number for maximum feed rate on the new Shark ll. I use a Bosch 1617 router.

  • #2
    there are a lot of variables to consider, Here is a quick summary Feeds and Speeds

    Most spindles (the term for the router attached to your cnc router) will go from about 7,000rpm to 18,000rpm. This speed is termed ‘spindle speed’ and is directly related to the feed rate or surface speed, which most machines are capable of doing up to about 200ipm. The two other variables, step-down and step-over should be kept so that the cross-sectional area engaged with the material is no more than the radius times the diameter of the bit. This is a rule of thumb, but it’s a good starting point for feed and speed calculations.

    To recap:
    • Spindle Speed – rotational speed of the cutting tool in revolutions per min
    • Feed Rate – Surface speed at the center of the rotating tool
    • Step down – the distance in the z direction per pass that a cutting tool is plunged into the material
    • Step over – the maximum distance in the x/y direction that a cutting tool will engage with uncut material
    Calculating Feeds and Speeds

    Below is a formula for calculating feed rate:

    ChipLoad x CutterDiameter x NumberOfFlutes x SpindleSpeed = FeedRate

    Where chipload is the amount of material cut per tooth (feed per tooth). Feed rate is the surface speed of the cutting tool in inches per min, spindle speed is the rotational speed of the cutting tool in revolutions per min, number of flutes and cutter diameter are determined by your tool. In this case they are ¼ inch and 2 flutes. Depending on the size of your bit, the chipload for plywood is between 0.005 inches 0.01 inches per tooth. For small bits below 1/8 inch start with 0.005 and increase from it there. For bits 1/4 inch and larger you will probably not break anything starting out at 0.01.

    The size of the chipload or feed per tooth is a very important factor in machining, larger chips are able to pull away more heat. Smaller chips are easier on your machine and tools but can cause too much heat. You want to make chips that when dropped fall to the floor rather than become dust that stays in the air.

    When trying to hone in on your feeds and speeds with a new bit, guess as best you can using the feeds and speeds formula and touch the bit as soon as it stops spinning after making a few cuts (remember: safety first), it should be warm, maybe a little hot to the touch, but it should not burn you. If it is too hot, increase the feed rate or lower the spindle speed. Look at the quality of the edge after the cut has been completed. If it is wavy, that’s tool chatter and you should decrease your feed rate or increase your spindle speed.

    Use your ears too, the tool should sound good when cutting … trust your gut

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    • #3
      Thanks for your help

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      • #4
        If you are using Vcarve I would suggest going to their forum page, There are numerous discussions on feed rate that you can search and the users are extremely helpful.
        This forum does not seem as active.
        I am new to CNC and the Vectric forum has been an outstanding source of information.

        https://forum.vectric.com/

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