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  1. #1
    Join Date
    Mar 2011

    Question Feed Rates - Over The Speed Limit

    Hi All,

    I'm just getting comfortable running Mach3 with my new DIY CNC Router table. In general things are working well. I've had some good and repeatable experiences cutting quite a few 2D parts. So at this point I thought I'd try some 3D carving.

    Here's where my question comes up. When I cut 2D tool paths at 160 in/min., I see the feeds rise up to 160 in long straight-a-ways like they should. Now when I run a 3D tool path at 160 feed rate, the long straight cuts can climb as high as 600 in/min.!!!

    I've checked the G-Code. The line right before these fast cuts says, F160.0. Yet it will climb to my rapid setting of 600.

    I'm thinking it MUST be something with Mach3 settings.

    Any help would be appreciated.

    -- Bernie

  2. #2
    Join Date
    Jun 2007

    Re: Feed Rates - Over The Speed Limit

    I believe you are seeing the 'rapid' (G0) rates. This depends on the Mach3 tuning settings.
    Your F160 only applies at G1,G2 and G3 feed rates.
    Super X3. 3600rpm. Sheridan 6"x24" Lathe + more. Three ways to fix things: The right way, the other way, and maybe your way, which is possibly a faster wrong way.

  3. #3
    Community Moderator ger21's Avatar
    Join Date
    Mar 2003

    Re: Feed Rates - Over The Speed Limit

    There are no Mach3 settings that would do this.
    I agree with Neil, that I think you're seeing rapid moves, not cutting moves.

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    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  4. #4
    Join Date
    Mar 2011

    Re: Feed Rates - Over The Speed Limit

    Thanks guys.

    I'll investigate a little deeper and see what I can find.

    Sent from my iPhone using Tapatalk

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