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  1. #1
    Join Date
    Apr 2016
    Posts
    0

    Question Help with feeds and speeds

    Hi, very very noob on the cnc world talking:

    I've build myself a cnc to play with and after some tunnig and test cuts i've gonne for a bigger project.
    I'm using this bit 5pcs Extra Long 3mm 2 Flute HSS Aluminium Extended End Mill Cutter CNC Bit Kit | eBay and cutting some kind of plywood. With the zero experience i have, i'm using the feeds and speeds from easel, with a small difference.
    Feed: 800mm/min
    Plunge: 300 mm/minDepth per pass: 0.8 mm/min
    My spindle is Makita 3709, which only have one speed of 30.000 RPM.

    Problem:
    20 min after i started the milling, i start smelling burning wood ... 5 min later the bit was all black and the chipload was on fire. The chiload was not really chipload was more like a dust.

    What am i doing wrong ? How can i adapt feed and speed to different materials or bits ?
    I looked all over but the feeds and speeds that i see are all 3,9999 mm of depth, and that my machine can't handle.

    Hope you cnc'ers can help me.
    Thank you

  2. #2
    Join Date
    Apr 2015
    Posts
    113

    Re: Help with feeds and speeds

    you are going WAY too fast on the spindle. I cut at 16k at 3-4000mm/min with a two flute!!
    Luthier/Woodworker/Machinist in NS, Canada.

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