Re: [CAD_CAM_EDM_DRO] Re: Shaft balancing

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
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