R8 Arbor With Jacobs Taper | The Hobby .
· R8 Arbor With Jacobs Taper. Thread starter kingmt01; Start date Jan 8, 2016; K. kingmt01 Registered. Registered . Joined Apr 29, 2015 Messages 899. Jan 8, 2016 #1 I have It came with a R8 arbor with a Jacobs taper. Does anyone know what size that taper would be? I tried to put a j33 chuck on it but it is bigger then the arbor. Those are the only two places it is touching on the very .