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Thread: Spindle sinks overnight

  1. #1
    Join Date
    Oct 2017
    Posts
    4

    Default Spindle sinks overnight

    We just got our new PRS going, after attaching the dust collector hose we find the spindle sinks to the table overnight, broke a bit off this morning when the operator tried to raise it using the directional buttons.

    Question: Not wanting to reinvent the wheel... is there a way to adjust tension, counterbalance or otherwise prevent this?

  2. #2
    Join Date
    Sep 2012
    Location
    Blaine Mn
    Posts
    256

    Default

    There are two springs on the back of the Z carriage- I think that shopbot has different springs for different configurations.

  3. #3
    Join Date
    Jan 2015
    Location
    Palm Coast, FL
    Posts
    191

    Default

    My Z axis has a pneumatic assist, so it will drop when I disconnect the air. I always park the machine in the same spot and pop a 2x4 cutoff under the spindle before disconnecting the air. It drops down and rest on the 2x4.
    PRS Alpha 96-60 ATC
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  4. #4
    Join Date
    Jun 2013
    Location
    Pasadena, CA
    Posts
    898

    Default

    I don't have a Shopbot but had the same problem. I installed a 20 lbs gas spring (a sealed pneumatic cylinder like the one that holds up the car hood) like this one: https://www.mcmaster.com/#gas-springs/=1a3z9cr. Unlike coil springs, the force does not change much over the stroke distance and they don't need a shop air connection. I made the mounting bracket a little flexible so that very small z-motions of a few 10/1000" don't make the gas spring move.

    They are specified for 25,000 cycles and I was concerned about durability but after 5 years of moderate use, so far so good. They are anyway cheap enough to replace.
    Box Joint, Dovetail and MazeMaker Software Here

  5. #5
    Join Date
    Jan 2004
    Location
    iBILD Solutions - Southern NJ
    Posts
    7,515

    Default

    Quote Originally Posted by ger.wat View Post
    We just got our new PRS going, after attaching the dust collector hose we find the spindle sinks to the table overnight, broke a bit off this morning when the operator tried to raise it using the directional buttons.

    Question: Not wanting to reinvent the wheel... is there a way to adjust tension, counterbalance or otherwise prevent this?
    If this is a new machine, call SB. ~ especially if you upgraded to a spindle last minute.

    Normally the Z shouldn't drop. Sounds like they could have installed the wrong springs at SB.

    -B
    High Definition 3D Laser Scanning Services - Advanced ShopBot CNC Training and Consultation - IBILD.com

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