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Thread: Lowering the speed

  1. #1
    Join Date
    Jan 2016
    Posts
    3

    Default Lowering the speed

    We have a ShopBot bought in 2006.

    The machine starts okay, works well but at some moment its speed is lowering.

    We operate with a speed of 25.4 mm on the axes x –y. When the fault occurs, the speed showed in the control panel is 25.4, but in reality is much smaller. As a result the normal route changes. If I stop the machine from the program and give it JH command, the machine never returns to the initial zero point.

    If I start the same program, the anomaly always occurs in another place. Very rarely the program does lead to the end. As a result I am producing more waste.

    How long lasts the anomaly is different : Sometimes is like a flash (it just feels like a shock – and here the deviations are almost unnoticed) … sometimes takes a few seconds and here are significant deviations ( sveral centimeters ) and everything is compromised.

    The anomaly occurs randomly, on the movement only on the X axis or only on the Y axis, or only on arcs (ie on both axes).

    What I’ve tried :

    --Restart – NO RESULT.
    --I've reistalled the operating program ( Setup_sb3_4_24_PRTalpha.eve ) - NO RESULT.
    --I replaced the Shopbot.ini with another one saved when the machine was working well-NO RESULT.
    -- I've turned off any other equipment to not introduce distortion - NO RESULT

    ASSUMPTION: the laptop is from 2005, the one that was delivered with the machine. It moves very slow. It may be this (one of) the cause(s) ?
    I’ve installed the operating program on a laptop much more efficient, but it fails to see the machine.
    Can you help me with a USB driver that will help me see the machine ? The new laptop only works on preview.
    Do you have another solution to help me ?
    If it does help, I can send pictures of deviations and of the problem.log file

  2. #2
    Join Date
    Jul 2014
    Location
    Bell, Florida
    Posts
    409

    Default

    Check for loose pinions causing lost steps
    Tim Lucas Custom Woodworks
    www.TLCW.us

  3. #3
    Join Date
    Jan 2016
    Posts
    3

    Default

    Thanks.
    I checked and there are no loose pinions.
    On the X axis are two drivers.
    I don’t think it can happen that both sprockets to slip exactly the same time.
    I checked also both drivers and they are aligned.
    The problem still persists.

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