Re: [ATM] Split ring polar alignment

[Daniel Fundo <fundo@bellsouth.net>]

<<  It only occurred to me recently that not only does the drive rate
change with split ring radius, but so does polar alignment.  Since it
rides on two rollers, the effect on alignment is sort of an average
depending on what sections of tube happen to be on the rollers at any
given time.  >>

Scott,  It sounds like you have a very good bend on that tube.  0.020
inch error on the diameter is great.  You can further decrease the
operating error by riding the horseshoe on two "trucks".  Each truck
consists of two bearings with a pivot between them.  The wider the space
between the bearings in each truck, the better.  This could effectively
reduce the error by half.

Another point: if you can identify where the greatest error is in the
horseshoe, and you use stepper motors for the drive, you can do error
correction with the drive itself.  Mel has done some of this periodic
error correction (even thugh its just one errer <G>) and can probably
help.

*****-----
Dan F.
Secretary/MAS
Memphis, TN
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