Re: [GrizHFMinimill] Re: Marks while face cutting
- 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 LSent: Tuesday, June 28, 2005 9:59 PMSubject: Re: [GrizHFMinimill] Re: Marks while face cuttingHi 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 -----From: cyberace10242003Sent: Wednesday, June 29, 2005 11:53Subject: [GrizHFMinimill] Re: Marks while face cuttingI 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?
--- In GrizHFMinimill@yahoogroupscom, "mrty737300" <marty1000000@h...>
> 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
> that setting while I made a cut. The results were markedly improved!
> This would indicate to me that the drive train has some issue,
> 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
> 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.