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IndustryArena Forum > MetalWorking Machines > Tormach Personal CNC Mill > .010" egg-shaped while circle milling.

Thread: .010" egg-shaped while circle milling.

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  1. 11-23-2020, 05:06 PM #1
    RussMachine
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    .010" egg-shaped while circle milling.

    Yikes!!

    I was circle-milling some bores yesterday, and they were coming out .010" egg-shaped.
    Y axis seems ok, as the bore was on size, but in X, I was getting +.010"

    Would this be a backlash issue? Or is it loose Gibs?

    Looks like it's time to tear the mill apart and tighten everything up.
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  2. 11-24-2020, 01:46 AM #2
    jwatte
    jwatte is offline Registered
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    Re: .010" egg-shaped while circle milling.

    It could be loose gibs on Y, or backlash on X, or even perhaps some slop in the head/spindle. Sure hope it isn't the last one!
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  3. 11-24-2020, 01:59 AM #3
    machinehop5
    machinehop5 is offline Banned
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    Re: .010" egg-shaped while circle milling.

    ...is frontlash possible? (wedge) Newton's Law of motice
    https://en.wikipedia.org/wiki/Newton%27s_laws_of_motion
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  4. 11-24-2020, 05:27 AM #4
    Tbkahuna
    Tbkahuna is offline Registered
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    Re: .010" egg-shaped while circle milling.

    What material and size and how were you holding it? I've seen egging like that in plastic parts held in a vise. The vise was compounding a little bit of out-of-round. If there is any flex in the piece that could be contributing to seeing something egged more than expected, even in metals.

    Do you see the same amount on different size holes?
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