Re: [CAD_CAM_EDM_DRO] Shaft balancing

Hi Roland:
     Are you talking about dynamically balancing a straight shaft like a spindle or an engine crankshaft?
If it is a perfectly round shaft of good material it should be very close to balance if no in perfect balance.
(As you well know).  But, if the shaft is out of balance, it will repeatedly stop at the same position when
rolled on a set of knife edges that our perfectly level.  This is the system used to balance grinding wheels
on cylindrical grinders.  If you are trying to check out a machine spindle while it is in place you will need
to use a pick-up that will sense the vib's at the speed the spindle it turning or at a harmonic of the unbalance.
The most simple check is to use a dial indicator mounted independent of the spindle with just the tip touching.
Then, using a variable rate strobe, adjust the strobe to read the travel of the indicator at it's max travel.
Next, mark different length lines every 90 to 45 degrees on the spindle with a felt pen near the area the the
indicator touches. Now, when you spin the spindle watch for which line is nearest the indicator tip when it is
at the max travel.  Hope the helps as I know of no equations just how it can be done.
     If you are talking about engine crank balancing, let me know and I can tell you about calculating the
bob weight to do a spin balance on them.
                                                             GOD'S BLESSINGS
                                                                     Bill Thomas

On Sat, 15 Oct 2011 19:02:28 +0200, Roland Jollivet wrote

>  
>
> Hi
>
> Is anyone aware of free software used for dynamically balancing shafts? Or
> maybe someone has written something?
>
> Regards
> Roland
>
> [Non-text portions of this message have been removed]
>
>

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