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  1. 01-08-2010 #2
    routercnc's Avatar
    Lives in West Midlands, United Kingdom.
    routercnc
    Last Activity: 6 Days Ago Has a total post count of 1,746. Received thanks 414 times, giving thanks to others 76 times. Referred 3 members to the community.
    Hi Ross,

    Ambitious!

    On this site they suggest bearing choice is down to the application, so no definitive 'right answer'. Ceramic bearings are sometimes used (silicon nitride).
    http://www.spindleservices.co.uk/Spi...ces_design.htm

    Can you machine it to hold the tight runout a spindle often has?

    What are you thinking of for balancing? Do you think building it all up and sending it off for balancing would be an option? Or do you think offsite individual part balancing, followed by offsite assembly balancing would be required?

    I went for the 3 phase and VFD option for the reasons you mention, plus nice and quiet!

    Here's another bit of info. Mentions bearing specs . . .
    http://henriksplace.se/cnc/new_machi...0_spindle.html

    And for bearing pre-load:
    http://machinedesign.com/article/how...-bearings-0919

    One from the skf magazine:
    http://evolution.skf.com/zino.aspx?articleID=20

    Best of luck . . .
    Last edited by routercnc; 01-08-2010 at 08:31 PM. Reason: more links
    Building a CNC machine to make a better one since 2010 . . .
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