driveshaft help

Balancing is ALWAYS needed, the weld yokes are cast, the slip yokes are cast, even the tubes aren't always perfect... The weld start/finish can make an issue



I can get shafts to .000 if the tubes are the better dom straightened driveline tube and or AL and not the cheaper seemed driveline tube and they still need balancing, very very rarely does a shaft not need weight...

For every 1000 shafts i do i might get 20 that are good if they are street shafts that only see balancing to 3000 rpm, i have yet to do a race shaft that is lightened spinning beyond 3000 rpm that doesn't need weight.

How do you true up each end in a lathe ? you can only hold 1 end at a time ? slip yokes have variances to them, flanges also, some driveline shops without the better balancing machines can't get them perfect or even balanced properly.

How do you hold the shaft at center on both ends at the same time? You use a steady rest and something at one end at a time?
Or are you using machined joints on the head end and in the dead center with a center chuck assembly?