Help me identify this collet system

[digit23]

Please help me identify this splindle tooling system

a)

This spindle is a Colombo RV90.2 SB. Spindle taper look like MT2 but it is a blind hole. Nut have a threaded hole at the bottom.





b)

What it the use of that threaded washer that I have unscrew ? Does it mean that the MT2 socket can be removed ? I can't find an exploded part list of that spindle. Someone can help ?



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[mactec54]

Please help me identify this splindle tooling system

a)

This spindle is a Colombo RV90.2 SB. Spindle taper look like MT2 but it is a blind hole. Nut have a threaded hole at the bottom.





b)

What it the use of that threaded washer that I have unscrew ? Does it mean that the MT2 socket can be removed ? I can't find an exploded part list of that spindle. Someone can help ?

Normally the RV-90 spindles take an ER25 collet that may be the wrong nut someone has put on your spindle, check the angle and the diameter of the spindle nose, it also could be some special that someone ordered from Colombo, does not look in very good shape for a highspeed spindle