Re: [CAD_CAM_EDM_DRO] Re: Shaft balancing

Hi Roland:
     Even if you are running 30,000 RPM the equipment to find the unbalance may not be required
to operate this fast.  Consider the harmonics!  You may be able to see the unbalance with a strobe
that goes to 3,000 to show you the position of unbalance.  If you are getting REALLY close the ink
of a felt pen will make a difference. Use different colors for different positions.  If you have the electronics
to sense the unbalance you can use it to trip the strobe.  Also, (same old rule) no matter how many
planes you are working with just change one at a time.  This is really critical when balancing multipiece
shafts with joints between.
                                                                 GOD'S BLESSINGS
                                                                      Bill Thomas

On Wed, 02 Nov 2011 10:49:26 -0000, inv_inv2006 wrote

>  
>
> Hi, google visual analyzer and read the articles to use this free soundcard software to balance rotational objects with a buzzer as sensor. Hope it helps.
> Indalecio
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, Roland Jollivet <Roland.Jollivet@...> wrote:
> >
> > On 2 November 2011 02:14, Steve Blackmore <steve@...> wrote:
> >
> > > **
> > >
> > >
> > > On Tue, 1 Nov 2011 20:40:32 +0200, you wrote:
> > >
> > > >Thing is, I want to be able to balance in selected planes, with add or
> > > >subtract. I'm after something like this, but not wanting to spend $000's;
> > > >
> > > >http://www.dynamic-balancing.com/software.htm
> > > >
> > > >I want to be able to balance small spindles to 30 000 or so, to mg
> > > >resolution, using accelerometers and some PC interface I/O. I can do all
> > > >the hardware, but the software is troublesome..
> > >
> > > Hi Roland, I've balanced a few turbine shafts that rotate to 150K rpm on
> > > a home built balancer. I've still got the bits somewhere. All it
> > > consisted of was two nylon yokes that held the ceramic bearings on the
> > > shaft, the yokes were slotted onto thin nylon sheet which allowed the
> > > whole assembly to flex. On these were glued transducers and the output
> > > into a two channel o'scope. This was mounted onto a solid base. The
> > > shaft assembly was driven by a rubber band to a small electric motor
> > > with a flat pulley on the shaft.
> > >
> > > Here's a "posh" version of my balancer <G>
> > >
> > >
> > > http://www.technologie-entwicklung.de/Gasturbines/Balancing_Tool/balancing_tool.html
> > >
> > > Details on how to use a 'scope for balancing are here
> > >
> > >
> > > http://www.tek.com/Measurement/cgi-bin/framed.pl?Document=/Measurement/App_Notes/interpmeas/&FrameSet=oscilloscopes
> > >
> > > no software needed :)
> > >
> > > Steve Blackmore
> > > --
> > >
> > > __._,_._
> > >
> >
> > Thanks Steve. Looks quite interesting. I suppose I should build and
> > experiment rather than let my imagination run wild on complexities. As ones
> > understanding increases, the instrumentation required usually simplifies...
> >
> > Regards
> > Roland
> >
> >
> > [Non-text portions of this message have been removed]
> >
>
>

--
Open WebMail Project (http://openwebmail.org)




[Non-text portions of this message have been removed]