Re: [CAD_CAM_EDM_DRO] Re: spindle motors

Hi Jon:
I run 9 hour shifts, 6 days a week. My spindle run time is about 60%.
I cut 90% plastics, 5% aluminum and 5% steel on this machine.
I cut dry 100% of the time in plastics, and I do squirt can lube with
aluminum and steel.
But: my spindle can't weigh more than 3 or 4 pounds, and I think that is
what makes the biggest difference.
They are also small diameter and close to the spindle nose.
The whole setup is more like a powerplane or a router, than a milling
spindle.

Cheers

Marcus
-----Original Message-----
From: Jon Elson <jmelson@...>
To: CAD_CAM_EDM_DRO@egroups.com <CAD_CAM_EDM_DRO@egroups.com>
Date: Wednesday, December 13, 2000 12:06 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: spindle motors

>
>
>Marcus & Eva wrote:
>
>>
>> I have done all sorts of abusive things to this spindle with never a

burp!

>> I have crashed, I have run unbalanced cutters at 7000 rpm (flycutters and
>> stuff), I have taken heavy cuts, I have run at 8000 rpm from a cold

start,

>> and I have never, ever serviced the spindle.
>>
>> Maybe the sensitivity of these systems is overstated??
>>
>> >
>> >They use super-exotic bearings, special lubricants, and active cooling
>> >systems to keep the bearings from getting hot. And, they have to
>> >replace the bearings fairly often, too. (Really often if coolant gets
>> >into them.)
>
>Well, this is from shops that run high speed for 8 hours a day or more.
>If you use it like I use my machine, that would be more like every
>25 years!
>
>Jon
>
>
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