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Re: [GrizHFMinimill] Re: Marks while face cutting

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  • Grady
    This sounds like the bearing preload generating the heat and should pass after some time. Man did the same for about an hour or less when it was new. ... From:
    Message 1 of 5 , Jun 28, 2005
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      This sounds like the bearing preload generating the heat and should pass after some time. Man did the same for about an hour or less when it was new.
      ----- Original Message -----
      From: Marty L
      Sent: Tuesday, June 28, 2005 9:59 PM
      Subject: Re: [GrizHFMinimill] Re: Marks while face cutting

      Hi Steve and thanks for the reply.
      I've spoken to the supplier and they are sending me a replacement machine so that I can compare them side by side and then send my original back (hopefully the replacement one will be better).
      Having said that, I've been fiddling around with the mill a little more and after light milling in aluminum, the spindle and collet were very warm/hot to the touch. The tool itself was not nearly so warm, thus the heat would appear to be coming from the machine rather than the work/cutting. With that in mind, I suspect that my mill definately has a problem in the head somewhere and if I had to be specific, I would say a bearing (probably the lower one) is gone. Anyhow, we shall see what happens when the new mill arrives.
      Cheers,
      Marty.
      ----- Original Message -----
      Sent: Wednesday, June 29, 2005 11:53
      Subject: [GrizHFMinimill] Re: Marks while face cutting

      I had a similar problem which turned out to be a cracked gear.  (Though
      I didn't try the dial indicator trick).  Do you hear a "clicking" sound
      from the gearbox?  Also, do you note any difference between the "low"
      and "high" gear range?

      Steve

      --- In GrizHFMinimill@yahoogroupscom, "mrty737300" <marty1000000@h...>
      wrote:
      > Just a further note to my last post, I had the mill running with the
      > dial indicator up to the bottom of the head. I adjusted the RPM to a
      > point where the dial indicator had minimal movement and left the RPM
      at
      > that setting while I made a cut. The results were markedly improved!
      > This would indicate to me that the drive train has some issue,
      because
      > an out of balance harmonic seems to develop throughout the RPM range
      > and this vibration in the head would be the cause of the rough cut.
      > Thus when I was able to set RPM via the dial indicator to hit a
      smooth
      > harmonic, the cut smoothened up markedly (if it cut like this
      > throughout the whole RPM range I would be really happy). Anyway, I
      > guess I have to go back and have the head exchanged.
      > Thanks,
      > Cheers,
      > Marty.


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