Re: [CAD_CAM_EDM_DRO] Speaking of VFDs

Hi, went to your site, nice, i spent 15 years in the balsa/model
airplane/helicopter/rc stuff. one of the shops i worked in tried to run a
Bridgeport at 5000 rpm to run a .060 seratted saw on ultra low density foam
for a govt project. the spindle failed after 2 months. was rebuilt at a
company where they make air bearings and was reassemble with the most
expensive care only to fail after 3 months. A new air spindle was mounted to
the mill with an r8 adapter and outboard bearing for the air spindle was
made, and then it worked for years before failure(due to bad air!)...
there are all kinds of powered spindles that should work for your
application without killing the Bridgeport spindle. cul brian f.

----- Original Message -----
From: <ccs@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, October 06, 2001 12:13 AM
Subject: Re: [CAD_CAM_EDM_DRO] Speaking of VFDs


>
> > My application is a little unusual. Ideally I want 4000 - 4500 rpm and
need
> > the full support of the spindle to eliminate any vibration, but there is
> > virtually no cutter load what so ever on the bearings. I am using a 6"
> > diameter .0625" 160 slotting saw blade to cut 5 lb/cu ft density balsa
wood
> > at 30 ipm. Figure blue styrofoam is 2 lb/cu ft and pine is about 25
lb/cu
> > ft. I need the rigidity of the spindle to eliminate any flutter in the
> > blade. Long story, bit if you want to see a little more about what I do
with
> > the wood take a look at my website http://www.IndoorDuration.com
>
> Tim, very nifty stuff. But is this perhaps better done on a table
> saw? Or maybe a modified deli slicer? Or a band saw with an
> extremely tight, wide blade. I would think you will get the best
> results with a spindle that is supported on both sides of the saw.
>
> You might be able to get upgrade bearings for the bport (ceramic
> balls/races) which could handle high speed running.
>
> Chris Stratton
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this page: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Manager
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>