[TheForge] Off-topic: ...dynamic balancing, vibration...

[Peter Fels & Phoebe Palmer]

The shade tree approach would be to suspend the shafted assembly between 
2 sharp, hardened points in the centering holes on the shaft ends, in a 
lathe. Then give it  some whirls and mark the bottom points when it 
stops moving. Shave off metal opposite the marks and repeat till crazy 
and the marks distribute randomly.
But i doubt that'll get you to 10,000 RPM.

Bruce Freeman wrote:
> Probably good advice, but no can do.  Where money is involved, I have
> to take a first go myself.  Other folks told me to draw up my parts
> and send them out to be made in a professional shop.  Had I done that
> I would never have got as far on this project as I have.  The
> turn-around delays alone would have done me in.  Not to mention the
> lack of opportunity to see for myself which designs were easily
> executed and which were bears.
> 
> On Wed, Jul 15, 2009 at 12:22 AM, Mike Spencer<mspencer at tallships.ca> wrote:
>> Bruce wrote:
>>
>>> So, I've spent the day reading up on dynamic balancing and have
>>> learned a fair amount, but nothing I can put to immediate use.
>> In the mid-70s, I was working in a sports/foreign/performance car
>> shop.  I visited a friend in Marblehead, Mass. who built formula Ford
>> engines and watched him use his dynamic balancing machine on
>> crankshafts that were going into high-performance racing engines.
>>
>> So when I got home, I started researching dynamic balancing because
>> our existing auto racing customers might be happy to pay for the
>> service and, as well, there was a lot of off-shore work going on in
>> Halifax and balancing engine and turbine parts might have been a cash
>> cow.
>>
>>> As anyone knowledgeable in the field can tell, I'm in over my head
>>> here.
>> Your (mathematical) head may stand higher than mine but that's what I
>> found, too.  This isn't something you can cobble together with duct
>> tape and a TIG welder unless you're Danny Hillis.
>>
>> Find a high-end speed shop, racing engine builder, turbine
>> maintainance shop or the like in your area and get them to put your
>> as-good-as-you-can-get-it piece on their machine.  There are just too
>> many vibrational modes and degrees of freedom to hand-hack it.
>>
>> Or maybe I'm just a wimp, y'know? :-)
>>
>>
>> - Mike
>>
>> --
>> Michael Spencer                  Nova Scotia, Canada       .~.
>>                                                           /V\
>> mspencer at tallships.ca                                     /( )\
>> http://home.tallships.ca/mspencer/                        ^^-^^
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> 
>