Random Orbital Bob
Established Member
I might switch my SC choice to the SC3 instead of the 4" version for the CL4 but probably not because when I had a CL4 my first chuck was a Supernova2 which is of course a 4" chuck. Furthermore, my CL4 was an original MT1 3/4" x 16 tpi spindle so less robust than MT2 x M33 and yet it coped with the SN2 no problem. The SC4 is of course a blatant rip off of the SN2 and look incredibly similar except as mentioned before, the clockwise tighten function and the fatter jaw slides. Part of this plays into what work you plan to hold because when I started I did turn a fair bit of green and out of true work as I experimented with organic forms and you need good holding powers for that hence the 4" chuck. I would trust a smaller 3" chuck less for that kind of out of balance work.
But if you were turning a 12" bowl on a mini or midi lathe and the blank was fairly true to start with (and you had variable speed to start slow) I would use a 3" chuck happily. I would just observe sensible speeds, sensible cut sizes and keep the tools sharp which you should do at all times anyway. I wouldn't use the little RP2000 but then again if I recall correctly, the manual specifies it's capable of turning a 12" bowl!! I wouldn't feel happy doing that personally.
But if you were turning a 12" bowl on a mini or midi lathe and the blank was fairly true to start with (and you had variable speed to start slow) I would use a 3" chuck happily. I would just observe sensible speeds, sensible cut sizes and keep the tools sharp which you should do at all times anyway. I wouldn't use the little RP2000 but then again if I recall correctly, the manual specifies it's capable of turning a 12" bowl!! I wouldn't feel happy doing that personally.